Dive Control System - 2A - Scuba Engineer · the diagram, Figure 5, Page 8. DCS-2A: Dive Control System-2A. The Trademark name of the device this manual describes. The DCS-2A contains

S A N TA B A R B A R A , CA LI F O R N I A

Dive Control System - 2AOperations and Maintenance Manual

Diving Systems International425 Garden Street

Santa Barbara, CaliforniaUnited States of America

Postal Code 93101Telephone (805) 965-8538

Fax (805) 966-5761

Dive Control System-2A, DCS-2A, DCS-3 and DCS-1 are trademarks of Diving Systems International.Use of these terms to describe products that are not manufactured by D.S.I. is not permitted

Manual prepared by Marine Marketing and Consulting & Diving Systems International.© 2000 Diving Systems International Document # 000525002

This page not used

Definitions of Signal WordsUsed in this Manual

DANGER: This word indicates an imminently hazardous situation, whichif not avoided, will result in death or serious injury.

WARNING: This word indicates an potentially hazardous situation, whichif not avoided, could result in death or serious injury.

CAUTION: This word indicates an potentially hazardous situation, whichif not avoided, may result in minor or moderate injury. It may also beused to alert against unsafe practices.

Warranty Information

DSI warrants every new mask, helmet, SCUBA regulator or diving control system (DCS) (each, a Product) to befree from defects in workmanship for a period of ninety (90) days from the date of purchase from a DSI authorizeddealer. This warranty covers all metal, fiberglass, and plastic parts, but does NOT cover rubber parts,communications components, or head cushions.Any defect of the product in workmanship or material covered by this warranty discovered within ninety (90) daysfrom the date of purchase must be promptly communicated in writing to the nearest authorized DSI dealer or (ifno such dealer in the buyer’s country) contact DSI directly at (805) 965-8538. No Product returns will be acceptedby DSI without a returned merchandise authorization (RMA) number from DSI. Upon receipt of the RMA fromDSI, the buyer should return the defective Product or part, freight prepaid, to an authorized DSI dealer or the DSIplant, as directed by the RMA. DSI will repair or replace the Product at no charge, within a reasonable time, asit deems necessary.

This warranty is null and void if:

1) The Product is not registered with DSI within ten (10) days of purchase, or

2) The Product has not been properly serviced and/or maintained according to DSI factory recommendedprocedures described in the manual or Product updates have not been performed as recommended by DSI,or

3) Unauthorized attachments or modifications have been made to the Product, or

4) The Product has been used for purposes other than those for which it was designed, or otherwise has beenabused, misused, or subjected to unusual conditions, or the Productís intended service has been exceeded.

EXCEPT AS SPECIFICALLY PROVIDED HEREIN, THERE ARE NO OTHER WARRANTIES,EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES FORMERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. THE PRODUCT COVEREDBY THIS WARRANTY IS MARKETED AND SOLD BY DSI SOLELY FOR COMMERCIAL ORINDUSTRIAL USE AND IS NOT A CONSUMER PRODUCT INTENDED FOR PERSONAL, FAMILY,OR HOUSEHOLD USE.

In purchasing any Product subject to this warranty, the buyer agrees that its sole and exclusive remedy and DSI’sentire obligation in contract, tort, or otherwise under this contract will be repair or replacement at DSI’s optionof the Product or any parts which DSI determines during the applicable warranty period are defective inworkmanship or material covered by this warranty. All exchanged parts are the property of DSI. The buyer’sexclusive remedy and the DSI’s entire liability in contract, tort, or otherwise is the payment by DSI of the buyer’sactual damages up to but not to exceed the amount paid by the buyer for the Product.

In no event shall DSI be liable to the buyer for indirect, special, incidental or consequential damages (including,but not limited to, damages for lost profits, lost sales, loss of business opportunity, or for injury to persons orproperty arising out of the use of the Products). Any claim or action for breach of warranty must be commencedwithin one year following delivery of the Product to the buyer.

Buyer acknowledges that this warranty is the sole and exclusive warranty of the Product and that it supersedesany and all oral or written representations and undertakings between DSI, its dealers, and the buyer relating to theProducts. This warranty allocates the risks of product failure between DSI and the buyer, which allocation isrecognized by both parties and is reflected in the price of the goods. The buyer acknowledges that it has read thisagreement, understands it, and is bound by its terms.

Table of Contents

Section Title Page #

1.0 General Information 1

1.1 Definitions 1

1.2 Design Purpose 2

1.3 Specifications 3

1.4 General Description 3

1.4.1 Breathing Air Sub System 4

1.4.2 Principle Operating Features of the DCS-2 4

1. Dive Control Panel 4

2. Red Diver Depth Gauge 4

3. Umbilical Pressure Gauge 4

4. White Diver Depth Gauge 4

5. Blue Air Supply Flow Indicator Line 4

6. Orange Air Supply Flow Indicator Line 5

7. Low Pressure Inlet Fitting 5

8. Blue Breathing Air Supply Gauge 6

9. Orange Breathing Air Supply Gauge 6

10. High Pressure Cylinder Yokes 6

11. Bottom of Case 6

12. Air Supply Selector Valve Handle 6

13. Regulator Adjustment Knob 6

14. Outlet Manifold 7

15. Pneumo Valve Handle, White Diver 7

16. Pneumo Valve Handle, Red Diver 7

17. O-Ring Seal 7

18. Communicator Panel 7

19. Communicator 7

2.0 Operating Instructions 8

2.1 Unpacking the DCS-2 8

2.2 First Use of DCS-2 8

Section Title Page #

2.3 Connecting the Air Supply 8

2.4 Connecting Diver's Hoses 9

2.5 Pre-Dive Checklist 10

2.5.1 Testing the L.P. Supply 10

2.5.2 Testing Communications 11

2.5.3 Testing the Pneumo 12

2.6 Preparing the Diver 12

2.7 Dive Supervisor and DCS-2A Operator 12

2.8 Descent 13

2.9 Diver at Depth 14

2.10 Changing out High Pressure Cylinders 14

2.11 Procedures During the Diver's Ascent 14

2.12 Decompression 15

2.13 Completion of Diving Operations 15

3.0 Maintenance of the DCS-2A 16

3.1 Recommended Maintenance 16

3.2 Replacing the Battery 16

4.0 Troubleshooting 17

4.1 General 17

4.2 No Communications 17

4.3 No Pneumo Reading 18

4.4 No Air to the Diver 18

5.0 Appendix 19

5.1 Emergency Procedures 19

5.2 Diver Line Pull Signals 19

5.3 Communications Wiring Schematics 20

5.4 DCS-2A Exploded Views & Parts Listz 20

5.5 DCS-2A Dive Log Master Sheet 24

Dive Control System 2A with no communications.

Dive Control System 2A with communications.

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© 2000 Diving Systems International Document # 000525002

Section 1.0

High Pressure (H.P.) Hose: A flexible hose designedto carry a working pressure of gas (or air) of morethan 300 pounds (20.7 bars) per square inch. Therated working pressure is usually indicated on thehose and must not be exceeded. The working pres-sure of the high pressure hose on the DCS-2A is 5000psi (345 bars).

Whip: A hose complete with fittings at each end foruse in hooking up two pieces of deck equipment forgas (or air) flow. For instances, the hoses and fit-tings used to connect the DCS-2A to the high pres-sure tanks are called "high pressure whips."

H.P.: High pressure. Usually any pressure over 300psi. (20.7 bars).

L.P.: Low pressure. Usually any pressure under 300psi. (20.7 bars).

Pneumofathometer: (pronounced "new-mo-fathometer") This device measures the diver's depth.A small hose, which is part of the diver's umbilicalruns from the DCS-2A to the diver. The hose is openat the diver's end and attaches with a fitting to a gaugeat the DCS-2A. The gauge is calibrated in feet andmeters of sea water . A valve is attached betweenthe hose and the gauge so the operator can use asmall amount of breathing air to purge water fromthe small hose. When the valve is shut off, excessair bubbles out of the hose at the diver's end, and theair left in the hose will be at a pressure equal to thepressure of the water column. This is the exact depthof the diver.

Pneumo: Short for pneumofathometer. Used suchas "pneumo-gauge," "pneumo -valve", "pneumo-hose", to describe the parts that make up the pneu-mofathometer subsystem.

Offshore Rig: A ship or platform equipped with adrilling tower (rig) used in drilling for petroleum.

1.1 DEFINITIONS

The following terms may be unfamiliar to the reader.They are defined as they relate to this manual anddiving.All parts locations are referenced by LETTER onthe diagram, Figure 5, Page 8.

DCS-2A: Dive Control System-2A. TheTrademark name of the device this manual describes.The DCS-2A contains all of the componentsnecessary to properly control and monitor surfacesupplied air dives. Included in the DCS-2A is a two-way voice communicator for talking between theDCS-2A operator and the diver(s), or diver-to-diver.The communicator operates in both the two wireand four wire mode. The DCS-2A will supply plentyof air for two surface supplied divers.

Scuba: Self contained underwater breathing appa-ratus.

SSAir Diving: Surface Supplied Air Diving. Div-ing operation where the diver is supplied breathingair by way of a hose which is part of the diver'sumbilical from the surface. Usually the source ofthe breathing air is a compressor, but compressedair tanks on the surface can also be used.

Diver's Umbilical: Several components run to-gether from the DCS-2A, (Dive Control System 2A)to the diver. These components are joined together,usually by tape, forming the umbilical. The mostcommon components used in the diver's umbilicalare: (A) a hose through which the breathing air flowsto the diver; (B) a multiconductor wire for commu-nications transmission; (C) another (smaller) hosewhich is used to show the diver's depth on the pneu-mofathometer (see below); (4) a strong line used asa strength member to prevent strain on the othercomponents of the umbilical. The umbilical shouldbe taped every 10 feet with colored tape to indicatethe length of the hose.

GENERAL INFORMATION

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Dressed-in: A commercial diver's suit was origi-nally called a "dress." Although the name changedto "suit" the term "dressed-in" has remained to de-scribe putting the suit on. A diver who is "dressed-in" has a suit on. The term is also used to describe adiver who, in addition to his suit, has more, or allof his/her equipment on.

Bailout Bottle: This is the emergency tank ofbreathing gas. "Bailout" which is the familiar termfor parachuting from an airplane, also applies tothe shallow water diver who ditches part of his div-ing gear and swims to the surface. The "bailout"bottle term came from this use.

The bailout bottle is an independent air source con-nected directly to the diver's mask or helmet via afirst stage scuba regulator and hose. The first stageregulator must be equipped with an overpressurerelief valve (DSI Part #200-015). The overpressurerelief valve will vent pressure in the event of a firststage leak and prevent the low pressure hose fromrupturing, causing a complete loss of the diver'sbailout supply.

The bailout bottle is worn on the diver's back,mounted to a harness. The diver's umbilical shouldbe attached to this harness to prevent a direct pullon the diver's mask.

The size/volume of the bailout bottle should be de-termined by the diver's depth, or the distance re-quired for a direct ascent to the surface. For deeperdives, or penetration dives inside wrecks or pipe-lines, a larger capacity bailout bottle should be used.

1.2 DESIGN PURPOSE

The Dive Control System-2A (DCS-2A) is designedto provide a central control center for the operator/dive supervisor during a surface-supplied air dive.Provisions for the control of the breathing air sup-ply, diver depth monitoring, and voice communica-tions are all located on a simple panel. The DCS-2Ais full service control system for all SSAir divingoperations.

The DCS-2A can be fitted with optional shut offvalves on the diver’s air supply. The optional shutoff valves are designed to allow air to be shut off oneither or both of the diver’s umbilicals. When thehandles of the valves are vertical the valves are openand air is flowing to the divers. When the valvehandles are horizontal the valves are shut and the airto the divers umbilicals is off.

By having total control located at one panel, theDCS-2A operator can rapidly respond to the diver'sneeds without leaving the control station. In a stan-dard commercial SSAir diving operation the DCS-2A provides a backup air supply system which theoperator can activate in the event of the main airsupply failure (such as compressor malfunction).This can be accomplished without leaving the con-trol panel, which allows the operator to inform thediver and continuously monitor umbilical supplypressure and depth at the same time.

The compact size of the DCS-2A usually makes itpossible to locate it at the water entry site, allowingthe operator to tend the diver's umbilical while main-taining control of the DCS-2A.

In addition to its compact size, the ability of the DCS-2A to use high pressure air allows SSAir diving fromsmall boats or remote locations where transporta-tion and setup of a compressor would be impracti-cal. Two or more standard scuba bottles can be usedas the breathing air supply.

For example, when commercial divers are workingon an offshore rig, a common SSAir diving job isthe inspection and cleaning of a propeller on a crewboat. This job can be performed easily and simplywith the DCS-2A, a couple of scuba bottles, a fullface mask or helmet, and an umbilical. Transporta-

Fig. 1 Divers with all of the gear they need to dive.

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Low Pressure Supply Pressure Maximum: 225pounds per square inch. (15.5 bars)

CAUTION: Although the high pressure gaugeson the DCS-2A are rated to 5000 psi (345 bars),this is a safety precaution only. The regulator onthe DCS-2A is not designed to operate atpressures greater than 3000 psi (207 bars).

Umbilical Pressure Range: 115-225 pounds persquare inch. (8-15.5 bars)

Regulator Output: 40 SCFM at 2500 psi (172 bars)supply pressure with 150 psi (10.3 bars) deliverypressure.

Relief Valve: Set at 300 psi (20.7 bars).

Pneumofathometer Range: 0-250 FSW (feet of seawater) (0-76 meters).

Communicator: 4 wire system. Can also be usedin 2 wire mode.

Battery Type: Rechargeable, 12 volt system.

Battery Performance: 20 hours of continuous usebetween charges in 4 wire mode.

Charger: Will accept external 12 volt source.

Communicator Power Output: 8 watts.

Communicator Frequency Response: 600 to12,000 HZ.

Remote Operation Capability: Yes, with optionalunit.

Direct Recording Capability: Yes.

1.4 GENERALDESCRIPTION

The DCS-2A components are housed in a durablepolyethylene case. However, caution should be usedin transporting the DCS-2A. Rough handling willrarely cause damage to the case, but it is possible todamage the calibrated pneumo gauges and/or theelectronic components. The DCS-2A should betreated as you would any expensive life supportequipment.

tion to the job site is simple and a large surface sup-port vessel is not needed. At the dive site, full com-munications, backup breathing supply, pressurereadouts, and depth monitoring are provided by theDCS-2A.

This is one of many situations where the DCS-2Acan be used to provide the safe and efficient opera-tion of SSAir diving.

1.3 SPECIFICATIONS

Use: For SSAir diving only. Pure oxygen MUSTNOT be used. Compressed air from high pressuretanks (scuba or other types of compressed air tanks),or from a compressor should be the only supply tothe DCS-2A

CAUTION: Pure oxygen is a potential firehazard, its use can lead to explosion of the DCS-2A. Pure oxygen also presents a physiologicalhazard to the diver.

Outer Dimensions: Length = 21 inchesWidth = 10 1/2 inchesHeight= 17 1/2 inches

Weight: 54 pounds. (24.5 kilos)

Shipping Weight: 60 pounds. (27 kilos)

Maximum Life Support Depth: 240 fsw (feet ofsea water) (73 meters).

CAUTION: Although the DCS-2A is capable ofsupporting AIR DIVING to a MAXIMUMDEPTH of 240 feet (73 meters) of sea water,human limits restrict air diving to 190 fsw in theU.S. Navy and 50 meters in most Europeanoperations.

CAUTION: Decompression and other humanlimits must be observed. Decompression divingshould not be conducted with the DCS-2A unlessa properly equipped recompression chamberfacility with oxygen is immediately available atthe dive site. In-water decompression is notrecommended.

High Pressure Supply Pressure Maximum: 3000pounds per square inch. (207 bars)

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1.4.1 BREATHING AIRSUBSYSTEM

The diver's breathing air subsystem starts with thesupply tank yokes (K) and connect to the diver'ssupply manifold. The high pressure hoses with theyokes are stored for transit by connecting them tothe posts on the panel inside the lid of the DCS-2A.The knurled knobs on the yokes should be tight-ened until just snug. Excessive force should not beapplied.

1.4.2 PRINCIPLEOPERATING FEATURES OFTHE DCS-2A

l. DIVE CONTROL PANEL (A)

The panel is the main frame to which the functionalcomponents are mounted. In addition, the compo-nent names and some instructions are on the panel.The blue and orange lines (K, Q) on the panel rep-resent the flow paths of supply air from the twohigh pressure hoses/yokes (S).

2. RED DIVER DEPTH GAUGE (C)(PNEUMOFATHOMETER)

This gauge indicates the "red" diver depth. The reddiver pneumo valve knob (D), is turned to supply asmall volume of air to the small pneumo hose thatis part of the diver's umbilical. The gauge reads thepressure of the air in the pneumo hose. This pres-sure, measured in feet (or meters) of sea water,equals the water pressure at the diver's depth.

3. UMBILICAL PRESSURE GAUGE (B)

This gauge (B) is connected to the low pressure airsupply system that supplies both umbilical fittings.It indicates the breathing air pressure that is in boththe "red" and "white" diver umbilicals. When theair supply is from high pressure tanks (such as scubatanks) the umbilical hose pressure can be varied byturning the regulator adjustment knob (H)

4. WHITE DIVER DEPTH GAUGE (P)(PNEUMOFATHOMETER)

This gauge indicates the "white" diver depth. Thewhite diver pneumo valve knob (O), is turned tosupply a small volume of air to the small pneumo-hose that is part of the diver's umbilical. The gaugereads the pressure of the air in the pneumo-hose.This pressure, measured in feet (or meters) of seawater, equals the water pressure at the diver's depth.

5. BLUE AIR SUPPLY FLOW INDICATORLINE

The "BLUE" air supply flow indicator line (Q) in-dicates the flow path of breathing air from entry intothe DCS-2A to exit to the diver's umbilical(s) at thefittings on the manifold (G). There are two high pres-sure whips which are color coded BLUE and OR-ANGE.

Starting from the high pressure air tank, the BLUEair supply flows through the whip into the DCS-2A. Following the BLUE flow indicator line (Q) itshows the flow to the BLUE Breathing Air SupplyPressure Gauge (M), then to the Breathing Air Sup-ply Selector Valve which is controlled by the Breath-ing Air Selector Valve Handle (I). The SelectorHandle (I) must be turned all the way "UP" until itstops for the BLUE supply. This places the selectorvalve handle in line with the flow path indicatingthe "BLUE" air supply (Q). The ORANGE supplyis off when the Selector Handle is in the up posi-tion.

CAUTION: When using H.P. air, the selectorhandle must be turned up until it stops for BLUEsupply or down until it stops for Orange supply.Never allow the selector handle to stay in themarked “H.P. OFF ZONE”. Both high pressureair supplies are off in the yellow striped H.P. OFFZONE”.

After flowing though the Selector Valve the BLUEair supply enters the Breathing Air Supply Regula-tor (H) which reduces the high pressure breathingair to an adjustable range between 115-225 poundsper square inch (psi) (8-15.5 bars). The BLUE airsupply then goes to both diver's umbilicals throughthe fittings on the manifold (G).

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DCS-2A MANUAL


6. ORANGE AIR SUPPLY FLOWINDICATOR LINES

The "ORANGE" air supply flow indicator line in-dicates the flow path of breathing air from entryinto the DCS-2A to exit to the diver's umbilical(s)at the fittings on the manifold (G). The second highpressure whip is color coded ORANGE.

Starting from the high pressure air tank, the OR-ANGE air supply flows through the whip into theDCS-2A. Following the ORANGE flow indicatorline (K) it shows the flow to the ORANGE Breath-ing Air Supply Pressure Gauge (L), then to theBreathing Air Supply Selector Valve which is con-trolled by the Breathing Air Selector Valve Handle(H). The Selector Handle must be all the way"DOWN" until it stops for the ORANGE supply.The BLUE supply is off when the Selector Handleis in the down position.

After flowing through the Selector Valve the OR-ANGE air supply enters the Breathing Air SupplyRegulator (H) which reduces the high pressurebreathing air to an adjustable range between l15-225psi (8-15.5 bars). Then the ORANGE air supply goesto both diver's umbilicals through the fittings on themanifold (G).

7. LOW PRESSURE INLET FITTING (N)

The low pressure inlet fitting is positioned betweenthe connections for the two H.P. supply hoses. It ismarked by the arrow containing the words "L.P.Supply". Low pressure supply breathing air, usuallyfrom a compressor (with volume tank) is suppliedthrough a whip (low pressure hose and fittings) thatattach here. When the low pressure supply is the onlyair source, the supply pressure will be indicated onthe umbilical pressure gauge (B). In the low pres-sure supply mode, the selector/ valve handle will hepositioned in the H.P. OFF ZONE.

A Dive Control panelB Umbilical Pressure

C Red Diver Depth Gauge

D Pneumo Valve Handle, RedE Divers Umbilical Breathing Hose Attachment Fittings

F Pneumofathometer Hose Attachment Fittings

G Outlet ManifoldH Regulator Adjustment Knob

I Breathing Air Supply Selector Valve Handle

J CaseK Orange Air Supply Flow Line

L Orange Breathing Air Supply Gauge

M Blue Breathing Air Supply GaugeN Low Pressure Inlet Fitting

O Pneumo Valve Handle, White

P White Diver Depth GaugeQ Blue Air Supply Flow Line

R Communicator

S Yokes for H.P. Cylinder AttachmnetT Access door for storage compartment.

U O-Ring Seal

V Communicator Panel

AB

C

D

E

F

G

H I J K L M

N

O

P

Q

R

S

T

U

V

Fig. 2

CAUTION: When using H.P. air, the selector handle must be turned up until it stops for BLUE supply ordown until it stops for ORANGE supply. Never allow the selector handle to stay in the marked “H.P.OFF ZONE”. Both high pressure air supplies are off in the yellow striped H.P. OFF ZONE”.

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8. BLUE BREATHING AIR SUPPLYPRESSURE GAUGE (M)

The Blue pressure gauge (M) indicates the pres-sure remaining in the "BLUE" high pressure tank.(NOTE: If two divers are supplied by the DCS-2Aboth divers will be breathing from the same se-lected high pressure supply).

9. ORANGE BREATHING AIR SUPPLYPRESSURE GAUGE (L)

The Orange pressure gauge (L) indicates the pres-sure remaining in the "ORANGE" high pressuretank. (NOTE: If two divers are supplied by theDCS-2A, both divers will be breathing from thesame selected high pressure supply).

10. YOKES FOR HIGH PRESSURECYLINDER ATTACHMENT (S)

The yoke fittings (S) provided have standard U.S.scuba cylinder attachments. Each yoke has ableeder valve to vent the remainder of the pres-sure in the whip when changing out scuba bottles.The yokes attach to posts mounted on the panel inthe lid of the DCS-2A for storage and transport.

11. CASE (J)

The Dive Control panel (A) is attached to the bot-tom half of the case (J). The top half of the case

contains the communicator panel with the yokeblocks and the communicator if there are commu-nications. If there are no communications there areonly the yoke blocks. ( see picture in front ofmanual). The top is not designed to be removed.

12. BREATHING AIR SUPPLY SELECTORVALVE HANDLE (I)

This handle (I) controls the two position BreathingAir Supply Selector Valve and allows uninterrupteddiving operations while full air supply tanks replaceexpended tanks. The selector valve controls ONLYthe high pressure air supply. It is NOT possible toshut off any low pressure supply connected to thelow pressure inlet fitting (N), at the DCS-2A itself.

CAUTION: When using H.P. air, the selectorhandle must be turned up until it stops for BLUEsupply or down until it stops for ORANGEsupply. Never allow the selector handle to stay inthe marked “H.P. OFF ZONE”. Both highpressure air supplies are off in the yellow stripedH.P. OFF ZONE”.

When changing out the H.P. air supply cylinders,always observe the diver's umbilical pressure gauge(B) for any sudden fall in pressure. Should this oc-cur, it indicates that the cylinder in use has mistak-enly been turned off. If so, immediately turn the cyl-inder back on and move the selector valve handle toselect the full cylinder and change out bottles.

Due to the construction of the selector valve, it isimpossible for gas to back-flow from one cylinderto the other.

13. REGULATOR ADJUSTMENT KNOBFOR UMBILICAL PRESSURE (H)

The regulator Adjustment Knob (H) allows the op-erator to adjust the umbilical pressure within a rangeof 115 psi to 225 psi (8-15.5 bars). Incoming highpressure air from the 'ORANGE" or "BLUE" sup-plies are reduced by the internal regulator. The Ad-justment Knob controls the regulator. Turning theKnob clockwise decreases the umbilical pressure;counterclockwise increases it.

Fig. 3 Air flow paths from the H.P. cylinders.

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DCS-2A MANUAL


14. OUTLET MANIFOLD INCLUDINGDIVER'S UMBILICAL FITTINGS (G)

The "WHITE DIVER" and "RED DIVER" air sup-ply hoses are connected to the DCS-2A at the mani-fold (G). The fittings coming out of the DCS-2A aremale #6 JIC (3/8", 37°) flared fittings. The diver'spneumofathometer hoses must have matching female#6 JIC flared fittings with swivel nuts.

The "WHITE DIVER" and "RED DIVER" pneumo-fathometer hoses are also connected to the DCS-2Aat the manifold (G). The fittings coming out of theDCS-2A are male #4 JIC ( 1/4", 37°) flared fittings.The diver's pneumofathometer hoses must havematching female #4 JIC (1/4", 37°) flared fittings withswivel nuts.

15. PNEUMO VALVE KNOB, WHITE DIVER(O)The Pneumo Valve Knob, White Diver turns on andoff the air supply to the "WHITE" pneumofathometersystem.

16. PNEUMO VALVE KNOB, RED DIVER (D)The Pneumo Valve Knob, Red Diver turns on andoff the air supply to the "RED" pneumofathometersystem.

17. O-RING SEAL (U)

The O-ring seal helps keep dust and moisture out ofthe DCS-2A when the case is closed. The O-ring sealis not pressure proof, however, and the DCS-2A casewill flood if the box is submerged.

18. COMMUNICATOR PANEL (V)

The diver's electronic communicator (R) is attachedto the communicator panel. The battery for the com-municator is located behind this panel.

19. COMMUNICATOR (R)

The communicator is a standard open circuit/roundrobin diver's communicator, which functions like atelephone. It can also be used as a 2 wire, "push-to-talk" system. It is connected to the diver's umbili-cals by "banana plug" fittings on the communica-tor. The communicator is mounted on the commu-nicator panel (V).

Depending on the configuration of your DCS, youwill have either a Model EM-013 Radio or an MK3-DSI radio. While the basic operations of these tworadios are the same, they each have a different panelset up and function switches. You should read andunderstand the accompanying radio operationsmanual supplied with the unit before using the unit.Improper use or connections could damage the ra-dio.

CAUTION: Never connect the charger during adive or when anyone is in contact with connectedequipment. Although electrical shock danger isremote, connection of the recharging cord shouldonly be done when the DCS-2A is not in use.

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DCS-2A MANUAL


2.2 FIRST USE OF THE DCS-2A

Place the Dive Control System on a firm surface.The DSI logo should be right side up. Release thelatches and lift up the lid to expose the panels.

When using the DCS-2A aboard a vessel subject towaves or swell be sure to tie the DCS-2A securelyin position so that it doesn't fall. Thread a piece ofline through the handles and fasten the ends to fit-tings on the boat. Tie back the lid of the DCS-2A aswell to prevent damage or injury.

2.3 CONNECTING THE AIR SUPPLY

Loosen the knurled knobs which connect the yokesto their storage posts in the DCS-2A and removethe yokes (S) from the blocks. Attach each yoke toa high pressure cylinder as you would connect ascuba regulator to a tank. The knobs on the yoke

Section 2.0

OPERATING INSTRUCTIONS2.1 UNPACKING THE DCS-2A

When you first receive your DCS-2A, carefully un-pack it and examine it for any damage that may haveoccurred during shipment. Be sure to complete theenclosed warranty card and return it to DSI imme-diately. No warranty claims will be honored with-out a satisfactorily completed warranty card on fileat DSI.

Visually check the DCS-2A to ensure that it has notbeen damaged in transport.

Fig. 6 Connecting a scuba air supply to the DCS-2A.

Fig. 5 Note the line which passes through the handle of theDCS-2A and is secured to the rail to prevent the DCS-2Afrom moving about.

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DCS-2A MANUAL


should be screwed down finger tight. Do not applyexcessive force to the knobs; air pressure from thetanks will create a good seal. Be sure the bleed valveon each yoke is in the closed position. Do not turnthe cylinders on at this time.

Prior to connecting the low pressure hose to theDCS-2A, the deck whip should be flushed with airto make sure no foreign matter is in the hose. Con-nect the deck whip to the low pressure compressorand while firmly holding the end of the hose startthe compressor and flow air through the deck whipfor at least one minute. Attach the low pressure hoseto the low pressure inlet fitting (N) and screw thefitting down finger tight. While using one wrenchto hold the low pressure inlet fitting tighten the hosefitting with a second wrench. Do not use excessiveforce as this will only damage the fitting and causeit to leak.

2.4 CONNECTING DIVER'S HOSESTO THE DCS-2A

Each diver's umbilical should be color coded withplastic tape to identify each individual hose. Thisaction will not only serve to make it easier to con-nect the hoses, but will also serve to differentiatebetween hoses for purposes of inspection or repair.

A standby diver should always be equipped andready to go to the diver's aid whenever a surfacesupplied diver is working in the water. Generally, itis not necessary for more than one diver to be in thewater at a given time when using surface suppliedgear. However, a standby diver is considered essen-tial for safe, surface supplied operations. Thestandby diver can be either a scuba diver or anotherhose supplied diver since the DCS-2A providesenough air for two hose supplied divers. In contami-nated water diving operations, however, both diversmust be equally equipped with a vulcanized rubberdry suit, dry gloves, and a SuperLite-17, SuperLite17-C, or a SuperLite-27 helmet equipped with adouble exhaust system.

CAUTION: Contaminated water divingoperations are very hazardous. They should notbe attempted without specialized training,procedures, and equipment.

Remove the protective caps from the outlets of themanifold (G) on the console. Connect the diver'sumbilical hose fittings (air supply hose and pneumo)to the DCS-2A. Remove the end caps from the hosesthemselves and while firmly holding the end of thehose, blow out the lines before connecting the hoses

Fig. 7 Always use the right size wrench to connect the hosesto the DCS-2A.

Check the function of the selector handle to ensurecorrect operation.

If available, a low pressure compressor should beused as the primary air supply and scuba cylindersshould be used as a backup, or reserve air source.

CAUTION: Low pressure compressors used forbreathing air should be specifically designed fordiving. Paint compressors or similar equipmentare unacceptable for diving applications.(Contact Diving Systems for a list of divingequipment manufacturers who can supplycompressors with breathing quality air).

DANGER: If a low pressure compressor is used,the intake must be at a sufficient distance fromand upwind of the exhaust. If exhaust gas issucked into the intake, the diver will suffer fromcarbon monoxide poisoning. This can be fatal.

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DCS-2A MANUAL


to the mask or helmet, (refer to the manual for themask or helmet for the proper connection proce-dures for your life support equipment). This actionwill prevent any foreign matter from entering thehelmet or mask breathing system. Once the hose isblown out, immediately connect the fitting on thehose to the fitting on the mask or helmet.

Connect the communications portion of the diver'sumbilical to the electrical fittings on the communi-cator (R) and to the mask or helmet. Be sure theproper connection is made with the right commu-nications line for each diver. The wires in the diver'sumbilical should be marked so it is easy to identifywhich plug connects to the earphone terminals andwhich plug connects to the microphone terminals.

2.5 PRE-DIVE CHECK

Prior to EVERY dive, the following should bechecked:

With the free flow and demand regulator on themask/helmet(s) shut off, turn on the air supply ateach of the air cylinders. During operation withscuba bottles as the main supply, the selector valvehandle must be FULLY up or FULLY down. Fullyup turns the "BLUE" supply on and the "ORANGE"supply off. Fully down turns the "ORANGE" sup-ply on and the "BLUE" supply off.

Note the air pressure in each cylinder by readingthe gauges (L,M). The low pressure supply shouldbe switched "OFF" at the source at this time. Acheck valve in the low pressure system will pre-vent any back flow to the compressor.

Both cylinders should be full prior to diving. Loadthe regulator on the DCS-2A using the regulatoradjustment knob (H). Observe the umbilical hosepressure (B) which should be set at 150 psi (10.3bars) over top side pressure, or 165 psi (11.5 bars)The regulator used in the DCS-2A is a non-ventingregulator. If the regulator has been left set at a higherpressure setting than is presently desired, the op-erator must turn the regulator adjustment knob (H)clockwise and vent air from the system by bleed-ing either the pneumo system or diver's breathingapparatus.

As the diver descends, the DCS-2A operator shouldincrease the regulator setting so that the umbilicalpressure is always 150 psi (10.3 bars) over the pres-sure at the diver's depth. Consult the table belowfor approximate pressure settings.

TABLE 1Suggested Regulator settings for the DCS-2A

Depth - fsw Pressure Optimal Minimum 0’ 14.7 psia 150 psig 150 psig 33’ 29.4 psia 165 psig 150 psig 66’ 44.1 psia 180 psig 150 psig 99’ 58.8 psia 195 psig 160 psig 132’ 73.5 psia 210 psig 175 psig 165’ 88.2 psia 225 psig 190 psig 198’ 102.9 psia 225 psig 205 psig

TABLE 1, MetricSuggested Regulator settings for the DCS-2A

Depth-Meters Pressure Optimal Minimum 0 1 bar 10.3 bars 10.3 bars 10 2 bars 11.4 bars 10.3 bars 20 3 bars 12.4 bars 10.3 bars 30 4 bars 13.4 bars 11.0 bars 40 5 bars 14.5 bars 12.1 bars 50 6 bars 15.5 bars 13.1 bars 60 7 bars 15.5 bars 14.1 bars

2.5.1 TESTING L.P. SUPPLY

With the air on at the bottles and the communica-tions switched on, check the mask regulator func-tion. The diver should insert his face in the mask/helmet and take several breaths to test the demandregulator in his mask.

To test the low pressure supply, place the selectorvalve handle (I) in the "H.P. OFF" zone and the con-sole will be running off the low pressure supply only.Observe the umbilical pressure gauge (B). As thecompressor cycles, the gauge will rise and fall asthe compressor's volume tank fills and empties. Theminimum pressure for most low pressure compres-sors will be approximately 175 psi (12 bars) Again,check the mask/helmet function which will also con-firm the low pressure supply routing.

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2.5.2 TESTING COMMUNICATIONS

Test the communications between the diver and theDCS-2A. With the communicator (R) switched on,turn the speaker switch to "on" and adjust the vol-ume to a comfortable level for both the diver andthe DCS-2A operator. In the 2 wire mode, the com-municator functions similarly to a citizens band ra-dio; i.e., the DCS-2A operator must depress the pushto talk switch to speak to the diver. In the 4 wiremode, the communicator functions like a telephoneconference call; i.e., everyone on the line can hearand speak to everyone else. In either mode, for thediver to talk top side, it is only necessary for him tospeak into the oral/nasal microphone in his maskor helmet. If two divers will be working together,test the cross-talk functions at this time as well.

To extend the life of the battery, it is recommendedthat the communications be used in the 4 wire mode.Operation as a 2 wire system uses relays inside theunit which will cause a higher battery drain.

CAUTION: In the 2 wire mode, when the push-to-talk switch is depressed, the DCS-2A operatorshould keep all of his communications short (10-15 seconds) at any one time. This allows the diverto call for assistance if necessary.

Plug the earphone connectors on the diver’s um-bilical into the earphone jacks on the communica-tor. Plug the microphone connectors on the umbili-cal into the microphone jacks on the communica-tor. This will create a 4 wire system/round robinsystem. Test the system and adjust all volume con-trols.

Unplug the earphone connectors on the diver’s um-bilical from the communicator and reinstall them inthe connectors attached to the plugs for the micro-phone. This will change the communicator to a 2wire system. Test this system and adjust volumes.

If there are no communications, recheck all of theconnections to ensure they are tight at each junc-tion. If the DCS-2A has been operating in a coastalenvironment, look for corrosion on the top side con-nectors which may interfere with the communica-tions. If corrosion is evident, disassemble the con-nectors, clean, and retest. If corrosion is heavy, re-place the top side connectors.

Substitute other masks or umbilicals to test for fail-ures in the microphones or umbilical. Substitute onepiece of new gear at a time to track the fault down.If the fault is in the mask or helmet, replace the ear-phones or microphones as needed.

If the fault is in the umbilical, disconnect the um-bilical and carefully inspect its length for damage.Look for obvious nicks or cuts.

If there is physical damage to the outside of the com-munications wire there probably is a break on theinside, too. Test the continuity of the wire end-toend with a volt-ohmmeter.

Uncoil the umbilical and lay it out flat with the twoends close to each other. Set the volt-ohmmeter toresistance (ohms) and hold one probe to one prongon an umbilical connector plug and touch the otherprobe from the meter to the wires (or connector) atthe opposite end of the diver's umbilical. Upon lo-cating the other end of the same wire, the metershould indicate zero resistance, i.e., there is a com-plete, uninterrupted circuit. If touching none of thewires at the other end of the umbilical produces azero reading and all readings are infinity (∼) , thisindicates a complete break in the wire. If the read-ing is somewhere between zero and infinity, andchanges as the umbilical is moved, this indicates apartial break, and communications will be intermit-tent. In either case, a waterproof splice must be madein the wire.

Fig. 8 Preliminary testing of the umbilical with a volt-ohmmeter to check for continuity.

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2.5.3 TESTING THE PNEUMO

The pneumo supply may be tested in either the highpressure supply mode or the low pressure supplymode. To test the pneumo, select either mode andpinch the open end (diver's end) of the red diverpneumo hose. With the hose crimped tightly shut,slowly open the red pneumo valve (D) momentarily,1/4 turn, and observe the needle's response on thered diver depth gauge (C).

2.6 PREPARING THE DIVER

The diver should be dressed in with the appropriateexposure suit for the local water temperature. Thediver should be equipped with a harness to providean attachment point for his umbilical. By attachingthe umbilical to the harness, the possibility of a di-rect pull on the diver's helmet or mask will be elimi-nated.

A bailout bottle should be mounted on the diver'sharness. Always dive with a bailout bottle, no mat-ter how shallow the dive. The danger of entangle-ment is always present and a bailout bottle will givethe diver that few extra minutes to free himself inthe event he becomes hung up on fishing line, wire,or other submerged objects.

The bailout regulator should be equipped with aquick disconnect whip to make it easier to dress thediver in and out. In addition, the bailout regulatorshould also be equipped with an over pressure re-lief valve (DSI Part #200-015). This will permit theregulator to bleed off and not rupture the low pres-sure hose connecting it to the diver's bailout or emer-gency valve, should the first stage develop a leak.

With the hose attached to the harness, tuck thepneumo hose under the harness at the diver's chest.This serves two purposes: 1) it provides instant ac-cess in the event the pneumo is to be used as analternative air supply; 2) gas absorption and elimi-nation of nitrogen is considered to occur at thediver's chest level.

When diving under a potential decompression situ-ation, a depth gauge or dive computer should beworn by the diver as a backup system. If decom-pression is anticipated there must be enough air onhand for the diver to complete the dive and the de-compression obligation.

2.7 THE DIVE SUPERVISORAND THE DCS-2A OPERATOR

During the diving operation, one person should al-ways be in charge to avoid confusion. Generally,this should be the most senior diver, by virtue of hisdiving experience.

CAUTION: Do not “peg” the needle on thepneumofathometer with a maximum reading. Atest of pressure equal to 50 feet (15 meters) onthe gauge is satisfactory to ensure correctoperation.

Close the valve after observing correct operation andrelease the end of the pneumo hose. The gaugeneedle should return to zero. Repeat the above pro-cedure for the white diver.

Fig. 9 Carefully test the pneumo prior to every dive.

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The dive supervisor may not always be the DCS-2A operator. The dive supervisor may want or needthe freedom to direct the entire operation includingthe tenders and other personnel. As such, he is re-sponsible for making decisions regarding divingconditions and safety. However, the DCS-2A op-erator must always be an experienced diver who un-derstands the diver's needs and has the diver's bestinterests always in mind.

CAUTION: The DCS-2A operator must not leavethe dive control system unattended while thediver is in the water. The DCS-2A operator is di-rectly responsible for the diver’s safety and wellbeing.

The diver must follow the DCS-2A operator's di-rections in regards to depth and time. The diver canNOT run the dive from the bottom. Thus, when thedive supervisor himself is required to dive he shouldrelinquish control to the next most senior diver re-maining top side.

2.8 DESCENT

Upon entering the water, the diver should immedi-ately recheck communications with top side and en-sure that his mask or helmet is working correctly.When he/she is ready to descend he should notifythe DCS-2A operator that he is, "Leaving the sur-face."

Both the diver and tender should communicate in anormal tone of voice. It should not be necessary foreither person to shout to be heard. Although thequality of the communications will usually be ex-cellent, not all divers speak clearly. The DCS-2Aoperator should listen carefully at all times to whatthe diver is saying.

Once the diver has entered the water, monitor hisdescent rate using the pneumo valve (D,O) andgauge (C,P). The diver's descent rate should notexceed 75 feet (23 meters) per minute.

As the diver descends, the DCS-2A operator shouldadjust the regulator (H) on the DCS-2A to provide150 psi (10.3 bars) over the pressure at the diver'sdepth at all times. This provides the best breathingperformance from the diver's demand regulator.

It is essential that the DCS-2A operator keep pacewith the diver's descent and not lag behind in hisdepth monitoring. If this occurs, it is possible forthe diver to exceed his maximum planned depthwithout the DCS-2A operator being aware this hasoccurred.

To operate the pneumo, turn the knob for the appro-priate diver, counter clockwise, until the indicatorneedle on the depth gauge starts moving. When thedepth gauge for the individual diver indicates a depththat is known to be deeper than the diver, the knobis turned clockwise until it is off. The indicatorneedle on the depth gauge will move shallower asthe air bubbles leave the open end of the pneumohose at the diver. When the needle stops, that is thediver's actual depth.

Most umbilicals are made up with the diver end ofthe pneumo hose having about two feet (.6 meters)of loose hose. The diver can use this hose as an airsupply for inflating lift bags or for taking an exact

Fig. 10 DCS-2A operator taking a reading with the pneumoknob. The knob should be turned very slowly.

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reading of the bottom depth. In an emergency, thepneumo air can be used as a breathing air supplyfor a diver. The diver tells the DCS-2A operator to"Turn on the pneumo-air...", then inserts the hoseinto the mask or helmet. When using the pneumo inthis mode the air pressure should be regulated bythe DCS-2A operator to be slightly greater than thediver's depth. For example, if the diver is at 100feet (30 meters), the pneumo should be opened un-til the gauge reads a depth of 110 feet (33 meters),so that a positive pressure exists.

The diver should practice using the pneumo as analternative air source under controlled conditionsin shallow water. The pneumo hose should be bub-bling when it is inserted in the diver's mask, other-wise the diver will receive a blast of water when thepneumo is first turned on.

2.9 DIVER AT DEPTH

Once the diver reaches the bottom, or his maximumplanned depth, the diver should inform the DCS-2A operator that he is, "On the bottom." At this time,the DCS-2A operator should ensure that he gets anaccurate depth reading. The DCS-2A operatorshould inform the diver that he is "Taking apneumo...", when he opens the pneumo purge valve.The diver should observe the end of the pneumohose and immediately inform top side that, "He hasbubbles...". Once the diver has a flow of bubbles atthe end of the hose, the pneumo valve (D,O) shouldbe closed immediately.

Should the diver move deeper at any time duringhis dive he must inform the DCS-2A operator andanother pneumo should be taken for a new maxi-mum depth reading. If the DCS-2A operator knowsthat the diver is moving over an uneven bottom heshould periodically take additional pneumo read-ings to ensure that the diver has not accidentallygone deeper and neglected to notify top side. Keepin mind, however, that every pneumo reading doesuse some air. If high pressure air is the air sourceand the dive is deep, or the diver is working hard,pneumo readings should be taken as sparingly aspossible.

2.10 CHANGING OUT HIGH PRESSURECYLINDERS

The DCS-2A operator should continuously moni-tor the diver's air supply at the two high pressuregauges (L,M) when diving with high pressure air asthe primary supply. When the initial supply sourcepressure drops to between 300 and 500 psi (20.7and 34.5 bars), depending upon depth, the divershould be switched over to the second air sourceusing the selector valve handle (I). While the diveris breathing off the secondary source a fresh cylin-der should be put on line immediately.

To change out high pressure cylinders, first closethe cylinder valve on the tank which is low. Oncethe valve is closed, open the bleeder valve on theyoke (S) and allow the pressure to bleed from theline. The high pressure whips are color coded to helpthe DCS-2A operator to ensure he is selecting thecorrect one. Always observe the umbilical pressuregauge (B) carefully during this procedure. If theDCS-2A operator is not careful he may accidentallyturn off the high pressure cylinder supplying thediver's breathing air. If the umbilical pressure gauge(B) needle starts to "fall", turn the cylinder back onimmediately and double check to ensure the correctcylinder is being changed.

When the high pressure whip is empty, unscrew theknurled knob on the yoke (S) and attach the yoke toa fresh cylinder. Tighten the yoke knob finger tight,close the bleeder valve, and slowly open the cylin-der tank valve. Read the new pressure on the appro-priate gauge (L,M).

2.11 PROCEDURES DURING THEDIVER'S ASCENT

At the end of the dive, the diver should prepare toleave bottom upon orders from the DCS-2A opera-tor. The DCS-2A operator must carefully note thediver's depth and time on the dive log. The DCS-2Aoperator is responsible for monitoring the diver'sascent rate which should not exceed 60 feet (18meters) per minute, or slower if a dive computer isbeing used to monitor decompression/no decom-pression status. The diver should not leave the bot-tom until he is instructed to do so by the DCS-2Aoperator. At the start of the diver's ascent he shouldinform top side that he is, "Leaving the bottom."

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DCS-2A MANUAL


The DCS-2A operator should carefully note the timein the dive log. The DCS-2A operator must monitorthe diver's rate of ascent carefully, observing hiswatch and the pneumo gauge (C,P) . There is noneed to pneumo the diver as he ascends because theair in the pneumo hose will automatically expandand vent the hose as the diver approaches the sur-face.

2.12 DECOMPRESSION

If the diver has decompression stop(s) required as aresult of his dive, slow the diver's ascent as he ap-proaches his first stop. Upon reaching his first stop,the diver should assume a relaxed and comfortableposition in the water. A weighted line or some otherapparatus should be provided to the diver to assisthim in maintaining a proper depth. Decompressionin mid-water, without a line or other method of fix-ing the diver's depth, is NOT acceptable as it is im-possible to maintain an exact depth without some-thing to hang onto.

An accurate pneumo should be taken at the diver'sdecompression stop. There should be no unneces-sary slack in the diver's hose, i.e., no part of theumbilical should be lower than the diver, as this willgive a false reading (deeper) of the diver's depth.Make sure the end of the pneumo hose is held at thediver's chest with the open end pointing down.

2.13 COMPLETION OF DIVINGOPERATIONS

Immediately following the completion of diving op-erations the dive station should be disassembledand the DCS-2A protected from the weather.

Both high pressure and low pressure air suppliesshould be turned off at their source. Bleed the airfrom the diver's umbilical(s) by opening the freeflow valve(s) on the diver's mask/helmet(s). Dis-connect the mask/helmet(s) from the umbilical andthe umbilical from the DCS-2A. Unplug the com-munications connectors and turn off the communi-cator (R). Plug both ends of the hose and cap theoutlet manifold (G) nipples on the DCS-2A to pre-vent foreign matter from entering either.

Open the bleed valves on the HP yokes (S) to al-low any remaining air to vent and replace the yokeson their storage posts. Disconnect the low pressureair source if used and cap the low pressure inlet(N) to prevent foreign substances from entering theDCS-2A.

If the DCS-2A has been used on the ocean the pan-els should be wiped down with a clean rag damp-ened with fresh water. The O-ring seal (U) on thecase may be periodically treated with Armor-Allor other rubber protection.

Place the DCS-2A in a dry area and recharge thecommunications.

Refill any high pressure cylinders (scuba) used dur-ing diving operations and store them in a securelocation.

Fig. 11 All of the outlet fittings on the DCS-2A must becapped prior to storage.

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Section 3.0

DCS-2A Maintenance

3.1 RECOMMENDED MAINTENANCE OFTHE DCS-2A

The DCS-2A requires very little user maintenance.With proper care, the DCS-2A should last for yearsand give excellent service.

On a daily basis, the DCS-2A operator should in-spect the high pressure whips attached to the yokes(S) for signs of wear.

After each use the case, interior panels and high pres-sure hoses should be wiped down with a rag whichhas a small amount of Armor-All. Never spray clean-ers directly on the DCS-2A.

Approximately every six months, the high pressurehoses should be treated with Armor-AIl or similarprotection.

Once a year, the DCS-2A should be returned to yourauthorized dealer, or Diving Systems International,to service the regulator, selector valve, and calibratethe diver's depth gauges. This is especially impor-tant if the unit is used for deep, decompression, orrepetitive dives.

3.2 REPLACING THE BATTERY

The battery used with the DCS-2A communicatoris very reliable and will offer many years of ser-vice. However, storing the DCS-2A with the bat-tery drained can cause the battery to fail. The bat-tery should be completely charged before storage.Gel cell batteries have an excellent shelf life if prop-erly charged prior to storage.

To replace the battery, remove the screws which holdthe communicator panel (V) into the top of the DCS-2A box. Do not remove the screws which securethe communicator to the larger panel. Tilt the panelout but do not remove it from the lid. The battery isheld in place by brackets and “Velcro” strips on theback of the large panel. Reach behind the panel andsupport the battery. Lift the panel and battery out asa unit.

Replace the old battery with a new unit. Positionthe new battery on the back of the large panel usingthe “Velcro” strips to hold it in place. Connect theleads back to the battery and push the communica-tor panel (V) back into its normal position. Installthe screws which hold the large panel in place andtighten them in a staggered pattern.Fig 12 After each use the case, interior panels and high

pressure hoses should be wiped down with a rag which hasa small amount of Armor-All. Never spray cleaners directlyon the DCS-2A.

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Section 4.0

Trouble Shooting the DCS-2A System4.1 GENERAL

The DCS-2A is an extremely simple system which should not malfunction if the instructions in this manualare followed. Most problems encountered in using the system can be easily remedied. The following informa-tion covers the common operating difficulties.

Probable Cause(s)

a)Communication power not on.

b) Communications incorrectlyhooked up.

c) Communications not hookedup.

Battery low or dead.

Terminals covered with corrosion.

Headset not workingShort in internal wiring.

Break in diver’s communicationwire.

Break in splice at waterproofconnector or failure of connector.Test with VOM.

a) One wire in cable is broken

b) Microphone/earphones dead.

Communicator not functional.

4.2 NO COMMUNICATIONS

Symptoms

1) No sound at either DCS-2A ordiver’s mask.

2) Battery indicator does not re-spond.

3) Communications weak or bro-ken up.

4) Communications will not workwith headset but works otherwise.

5) Communications interruptedwhen umbilical is moved.

6) Communications interruptedwhen waterproof connector ismoved.

7) Satisfactory communicationsthrough one earphone or micro-phone only (4 wire mode).

8) No sound at either DCS-2A ormask.

Remedy

Activate switch and adjust volume.

Switch terminal wires.

Plug into terminals.

Charge or replace battery, orbypass battery with external power.

Clean Terminals with wire brushto bright shiny metal.

Replace headset.Return to factory for repair

Splice wire if damage is minor.Replace wire if damage is major.

Replace splice or connector.

Stack connectors in microphoneterminals. Communicationsworks in two wire mode.

Replace microphone/earphones.

Return to factory for repair afterverifying no cure by followingabove procedures.

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4.3 NO PNEUMO READING

Symptoms

1) No air to diver’s end of pneumo

2) Gauge reads sustained pressureat surface.

3) Hose will not hold pressure andgauge needle will not rise.

4) Needle will not respond prop-erly to flow.

5) Air can be heard escaping intoconsole interior.

Probable Cause

Pnuemo hose not connected

Pneumo crimped or plugged.

Pneumo fitting cracked or loose.

a) Hole in pneumo hose.

b) Gauge mechanism damaged.

DCS-2A internal plumbing maybe cracked or broken.

Remedy

Attach fittings to DCS-2A

Check entire length of hose. Relieve any restrictions.

Check fittings at console withsoap and water solution. If fittingsbubble, either tighten or replaceas necessary.

Check hose; replace or splice asnecessary.

Replace or repair gauge. Returnto factory.

Return to factory for service.

4.4 NO AIR TO DIVER

Symptoms

1) No hose pressure in diver’sumbilical

2) No gauge reading on highpressure gauge.

3) Low hose pressure in diver’sumbilical.

4) Air can be heard escapingfrom hose.

5) Umbilical registers pressureat console gauge, but no flow atmask.

Probable Cause

a) primary air source not con-nected.

b) Valve closed at low pressuresource

c) Selector valve in “H.P. OFF”zone.

Valve closed at high pressuresource

Regulator not properly loaded.

Fitting loose on diver's hose, orfittings damaged.

Mask improperly serviced.

Remedy

Connect proper hose to console.

Open valve at low pressure com-pressor.

Move selector valve handle inline with flow from either highpressure source.

Open valve at high pressuresource.

Rotate adjustment wheel in ap-propriate direction.

Tighten fittings until snug. Do notover tighten. Replace fittings ifdamaged.

Clean and adjust mask.

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6) Air can be heard escaping intoconsole interior.

7) Umbilical hose pressure andsupply pressure drops rapidly.

8) With high pressure air on andregulator loaded, no umbilicalpressure.

Leakage in DCS plumbing.

Diver’s Umbilical cut or severed.

Regulator malfunction.

Return DCS-2A to factory forservice.

Replace diver’s hose.

Return DCS- 2A to factory forservice

Symptoms Probable Cause Remedy

5.0 APPENDIX5.1 EMERGENCY PROCEDURES

The following are general recommended emergency procedures. However, it is up to the indi-vidual diver and dive supervisor to make judgements under specific conditions on how to bestcope with particular situations.

5.2 DIVER LINE PULL SIGNALS

Problem

1) Loss of communications

2) Loss of primary air supply.

3) Diver’s umbilical severed.

4) Pneumo will not operate.

Action

a) Abort dive if operations are not absolutly necessary.

b) Use line pull signals as per this appendix section.

Switch to emergency backup system and abort dive.

a) Diver switches to bailout bottle and aborts dive.

b) Standby diver enters water and supplies first diver with airfrom pneumo.

a) Dive hose should be marked with colored tape every 10 feet.Take depth readings from this. (will only be approximate)

b) Diver’s personal depth gauge can provide back up.

# of Pulls

1

2

From Tender to Diver

“Are you all right?"When diver is descending, onepull means "Stop!”

"Going down"During ascent, this means,"You have come up too far, goback down until we stop you."

From Diver to Tender

“I am all right", or ... “I am on the bottom”

"Lower me down", or"Give me slack"

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# of Pulls

3

4

From Tender to Diver

"Stand by to come up"

"Come up"

From Diver to Tender

"Take up my slack"

"Haul me up

5.3 COMMUNICATIONS WIRING SCHEMATICS

If your DCS has communications, refer to the radio manual

The following parts are not shown on the blow apart drawing and are listed reference only.

Location Part # Description Qty

Not Shown 420-100 Case, Dive Control System-2A 1

Not Shown 405-039 Battery Charger Assembly 1

* The following parts in the interior plumbing require the use of Conical Seals, # 455-135.

the conical seals are provided with the items listed below.

Location Part # Description

29 405-105 Inlet Tube, H.P. (blue)

31 405-105 Inlet Tube, H.P. (orange)

40 405-106 S .S. Tube Assembly, H. P.

5.4 EXPLODED VIEWS & PARTS LISTS

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SA

NTA

B ARBA R A , CA L I FORN I A

DCS-2A EXPLODED VIEWS & PARTS LISTS

Key# Part # Description1 530-017 Screw2 415-104 Communicator3 530-035 Screw4 430-075 Washer5 410-003 Gasket, Foam6 445-105 Panel, Auxiliary7 450-106 Yoke Retainer8 420-125 Arrow, Orange9 420-120 Arrow, Blue10 445-115 Door, Storage Compartment11 420-160 Slide Latch12 330-405 Lock washer13 530-070 Screw

14 420-105 Box, Plastic15 410-145 Grommet16 415-110 Cable, Battery17 415-056 Battery, Gel Cell 12V18 430-064 DSI Small Knob19 455-050 Yoke & Bleeder Valve Assem.20 430-060 Retainer Ring21 455-065 Filter22 455-054 Hose, H.P. Supply23 410-006 Hose Protector, Orange

410-007 Hose Protector, Blue24 405-029 Hose, Yoke Assem., Blue

405-030 Hose, Yoke Assem., Orange25 455-135 Conical Seal

Communications Panel

22

DCS-2A MANUAL


Key

#

Par

t #

D

escr

ipti

on1

430-

111

Scre

w2

430-

134

Was

her

343

0-13

4W

ashe

r4

430-

111

Scre

w5

430-

075

Was

her

653

0-03

5Sc

rew

743

0-13

4W

ashe

r8

430-

145

Sock

et H

ead

Scre

w9

450-

144

Pneu

mo

Blo

ck10

455-

032

SS E

lbow

1145

5-00

7C

ap,

Pneu

mo

1245

5-00

6C

ap, U

mbi

lical

Out

let

1345

5-17

745

° Elb

ow14

450-

185

Flan

ge15

510-

014

O-R

ing

1653

0-07

0Sc

rew

1744

0-01

0Pn

eum

o G

auge

, Red

1844

0-13

0G

auge

, L.P

.19

440-

011

Pneu

mo

Gau

ge, W

hite

2044

0-11

5H

ose

Hol

der

2143

0-13

0W

ashe

r22

420-

012

Kno

b, P

neum

o23

420-

135

Dec

al24

450-

170

Kno

b, R

egul

ator

Adj

ustm

ent

2543

0-11

0Se

t Scr

ew26

450-

125

Mou

nt N

ut, R

egul

ator

2743

0-12

6W

ashe

r, R

egul

ator

Mou

nt28

450-

120

Stem

, Reg

ulat

or A

djus

tmen

t24

420-

225

Sele

ctor

Han

dle

3043

0-24

0N

ut31

430-

205

Was

her

3243

0-14

0Se

t Scr

ew, S

elec

tor

Han

dle

3344

0-13

5G

auge

, H.P

.34

455-

185

H.P

. Inl

et E

lbow

3545

5-11

1L

.P. I

nlet

Elb

ow36

450-

116

Was

her

3743

0-13

6W

ashe

r38

455-

152

Nut

3945

5-19

0N

ut, H

.P. I

nlet

Mou

nt40

430-

115

Was

her

4145

5-00

5C

ap, L

.P. I

nlet

4244

5-10

0M

ain

Pane

l43

445-

020

Gau

ge B

rack

et

4445

5-15

7V

alve

Bod

y45

455-

144

Val

ve f

lang

e46

455-

143

SS E

lbow

4743

0-14

1So

cket

Hea

d Sc

rew

4843

0-13

4W

ashe

r49

440-

210

Han

dle

Stop

5044

0-21

2V

alve

Han

dle

Opt

iona

l Shu

t Off

Val

ve

Pan

el M

ount

edP

lum

bing

and

Gau

ges

Opt

iona

l Shu

t Off

Val

ve


23

DCS-2A MANUAL


Key

# P

art

#

Des

crip

tion

Key

#

Par

t #

D

escr

ipti

on 1

455-

024

Con

nect

or, L

.P.

245

5-04

9C

heck

Val

ve, L

.P.

345

5-02

6M

ale

Elb

ow 4

405-

155

Tub

e, R

egul

ator

Sen

sor

545

5-12

0E

lbow

645

5-12

23/

8" N

PT N

ippl

e 7

455-

180

Mal

e R

un T

ee 8

455-

149

Stra

ight

Tub

e C

onne

ctor

935

0-06

2L

.P. P

lug

1051

0-01

3O

-Rin

g11

450-

142

Man

ifol

d B

lock

1245

5-14

9St

raig

ht T

ube

Con

nect

or13

405-

150

Tub

e, R

ed P

neum

o G

auge

1443

0-12

6W

ashe

r, R

egul

ator

Mou

nt15

405-

160

Out

let T

ube,

Red

Pne

umo

1645

5-18

0M

ale

Run

Tee

1745

5-04

0Fe

mal

e E

lbow

1845

5-05

1Pn

eum

o V

alve

1945

5-12

31/

4" N

PT N

ippl

e20

455-

121

1/4"

NPT

Str

eet T

ee21

455-

051

Pneu

mo

Val

ve22

455-

040

Fem

ale

Elb

ow23

405-

107

Tub

e, U

mbi

lical

Gau

ge24

455-

180

Mal

e R

un T

ee25

455-

040

Fem

ale

Elb

ow26

405-

161

Out

let T

ube,

Whi

te P

neum

o27

405-

102

Tub

e, W

hite

Pne

umo

Gau

ge28

405-

105

Inle

t Tub

e, H

.P. B

lue

2945

5-11

7M

ale

Bra

nch

Tee

3040

5-11

0T

ube,

L.P

. Sup

ply

3140

5-10

5In

let T

ube,

H.P

. Ora

nge

3240

5-10

4T

ube,

H.P

. Gau

ge33

455-

030

Con

nect

or H

.P.

3445

5-03

8St

reet

Elb

ow35

455-

135

Con

ical

Sea

l36

455-

196

Mal

e R

un T

ee, H

.P.

3745

5-03

2M

ale

Elb

ow38

455-

140

Sele

ctor

Val

ve39

430-

120

Was

her

4040

5-10

6SS

Tub

e A

ssy.

, H.P

.41

455-

105

Mal

e E

lbow

4240

5-12

0R

egul

ator

Ass

embl

y43

405-

145

Tub

e, M

ain

Pneu

mo

Supp

ly44

455-

047

Rel

ief

Val

ve45

455-

130

1/2"

Che

ck V

alve

L.P

.

A

460

-110

R

egul

ator

Bod

yB

4

10-0

10

Bac

k-up

O-R

ing

C

510

-010

O

-Rin

gD

4

50-0

38

Seat

(in

clud

es B

,C,E

,F)

E

410

-010

B

ack-

up O

-Rin

gF

5

10-0

10

O-R

ing

G

450

-037

Pi

ston

Ste

mH

5

10-0

14

O-R

ing

I

450-

034

O-R

ing

Cap

, Sm

all

J

510-

014

O-R

ing

K

510

-008

O

-Rin

gL

4

10-0

08

Bac

k-up

Rin

g, L

arge

M

450

-033

O

-Rin

g C

ap, L

arge

N

435

-006

Sp

ring

O

450

-032

Pi

ston

Hea

dP

4

10-1

19

O-R

ing

Q

410

-121

T

hrea

d Se

alR

4

30-0

22

Nyl

on L

ockn

utS

45

0-15

7 R

egul

ator

Cyl

inde

rT

4

55-0

26

Reg

ulat

or S

enso

r E

lbow

CA

UT

ION

- W

AR

NIN

GU

se o

nly

Div

ing

Syst

ems

Inte

rnat

iona

l Kir

byM

orga

n or

igin

al re

plac

emen

t par

ts. T

he u

seof

oth

er m

anuf

actu

rer'

s pa

rts

will

inte

rfer

ew

ith

the p

erfo

rman

ce ch

arac

teri

stic

s of y

our

life

supp

ort

equi

pmen

t and

may

jeop

ardi

zeyo

ur s

afet

y. A

ddit

iona

lly, a

ny s

ubst

itut

ions

will

voi

d an

y w

arra

ntie

s of

fere

d by

DSI

.W

hen

orde

ring

spar

es, a

lway

s ins

ist o

n K

irby

Mor

gan

Gen

uine

Par

ts.

Inte

rior

Plu

mbi

ng A

rran

gem

ent

24

DCS-2A MANUAL


DCS-2A DIVE LOG

Diver: Date:

DCS-2A Operator:

Dive Location:

Weather Conditions:

Purpose of Dive:

Low Pressure Air Source Pressure:

High Pressure Air Source Pressure:

Cylinder # Start Finish1 _______________________________

2 _______________________________

3 _______________________________

4 _______________________________

5 _______________________________

6 _________________________________

Dive Times:Diver Left Surface: ________________

Diver Reached Bottom: ____________

Diver Left Bottom: ______________ Maximum Depth:

Diver Reached Surface:______________ Total Bottom Time:

Repetitive Group: ________________ Decompression Required?: Y N

Decompression Schedule:______________________________________________________________________________________________________________________

Diver’s Signature_____________________ DCS-2A Operator _________________

Documents

Dive Control System - 2A - Scuba Engineer · the diagram, Figure 5, Page 8. DCS-2A: Dive Control System-2A. The Trademark name of the device this manual describes. The DCS-2A contains