ML303 v3 29 April 2003 Page 1 of 7

MiniPurge Interface Unit Handbook

ML303

CONTENTS: Specification Sheet General Information Installation, Operation & Maintenance Manual Certificates Drawings Project Specific Data

ML303 v3 29 April 2003 Page 2 of 7

SPECIFICATION SHEET

Customer: Date:

Contact Sales order No.

Customer ref Issue:

Customer O/N : Serial No. MiniPurge Interface Unit (MIU) (Amend details as required) Type Number : MIU/d_____________________ Location of MIU : Hazardous Area Certification : Sira 02ATEX1129

0518 II 2 G EExd IIC T6

Area Classification Group : Class 1, Div 1, Groups C & D T6 : EExd IIC T6 Pressurized/Alarm switch Actuated via 2 barg pneumatic signal from MiniPurge Alarm/Pressurized pneumatic output Contact Rating : DPST (SPCO) 3A 250Vac Power switch(es) Actuated via 2 barg pneumatic signal from MiniPurge Power Switch pneumatic output Contact Rating :4PNO (4PST) 16A 415Vac Silver Cadmium

Oxide MIU enclosure For the Hazardous Area : d________________ Conformity : UL & CSA, CENELEC Material : Aluminium Finish : Natural Cable entries NPT : M20 : Other : Wall mounting lugs : Yes We certify that the above numbered MIU conforms to the certificates as stated above. Signed: - Tested Date Inspected Date

ML303 v3 29 April 2003 Page 3 of 7

General Information Application Suitability EXPO hazardous area MiniPurge Interface Units (MIUs) are designed and built in

accordance with European CENELEC Standards EN50 014, EN50 018 and / or UL & CSA requirements for use in the USA and Canada. MiniPurge Interface Units also meet the requirements of the EMC and Low Voltage directives, and may carry the CE mark.

The units are European Certified by Sira Certification Services, refer to Appendix C for certification documentation. As with all equipment for use in Hazardous / Classified areas, local working and installation practices for hazardous area equipment must be adhered to when installing and maintaining this equipment. This equipment must only be installed by personnel who are aware of the requirements for installation of electrical equipment within hazardous locations.

Some of the MIUs are designed to be controlled primarily with compressed air. Where other inert compressed gasses are used (Nitrogen, for example) the user must take suitable precautions so that the build up of the gas does not present a hazard to health. Consult the Control of Substances Hazardous to Health (COSHH) data sheet for the gas used.

The following materials are used in the construction of MiniPurge Interface Units (MIUs). If substances that will adversely affect any of these materials are present in the surrounding environment, please consult EXPO for further guidance.

Materials of construction: Stainless Steel Nylon Mild (carbon) Steel Polyurethane Brass Acrylic Aluminium Silicone Rubber This equipment is designed for use under normal industrial conditions of ambient temperature, humidity and vibration. Please consult EXPO before installing this equipment in conditions that may cause stresses beyond normal industrial conditions. System Description EXPO range of MIUs is designed for use on a wide range of applications and

enclosures. They are to be used in conjunction with an EXPO MiniPurge Purge and Pressurization System, mounted on a Pressurized Enclosure, to control the power applied to equipment housed within the Pressurized Enclosure. The MIU receives pneumatic control signals from the MiniPurge and uses them to provide dry contact alarm signals and power switching.

Alternative versions of MIU are available which use intrinsically safe or increased safety switching systems to control the MIU functions. These are only available to special order. Contact the sales office for details.

This manual does not cover versions of MIU for mounting in the Safe Area or those using European

Increased Safety (EExe) components or intrinsically safe switching.

ML303 v3 29 April 2003 Page 4 of 7

The standard range of MIUs consists of 3 types: a. MIU/dAD/1DT/4X16/PO

Providing 4 pole 16 amp power switching and Alarm / Pressurized alarm contact

b. MIU/dXD/1DT/4X16/4NO/PO

Providing 4 pole 16 amp power switching, 4 pole x 5 amp signal switching and Alarm / Pressurized alarm contact

c. MIU/dTD/1DT/4X35/4NO/PO Providing 4 pole 35 amp power switching, 4 pole x 5 amp signal switching and Alarm / Pressurized alarm contact

All units are designed to be mounted in the hazardous area / classified location, and are built into aluminium flameproof / explosion housings. INSTALLATION The MIUs are designed to be mounted in the hazardous / classified location. The

area classification that the units are suitable for use in is as follows. Please note that the gas group varies for European / US area classifications. Europe Zone 1 & Zone 2 Gas Group IIC USA/ Canada

Class1 Divs 1 & 2 Gas Groups C & D

Units supplied in the dA size enclosure are also approved for US / Canada Gas

Group B (Hydrogen) Units supplied as suitable for use in both Europe and the USA/Canada will be

supplied with NPT tapped cable entries. Installation of cables to and from the unit must be made using appropriately

approved cable entry devices, correctly fitted in accordance with local regulations and installation practices.

Pneumatic connections from the MiniPurge to the MIU should be run in pipe suitable for the fittings supplied with the unit. As standard, the fittings on the output of the MiniPurge will be 1/8 BSPP / NPT female, and the inputs on the MIU will be M5 Female. An adapter is supplied with the MIU to adapt the M5 female thread in the pneumatic connection to 1/8 BSPP / NPT. It is recommended that pipe with appropriate 1/8 fittings (not supplied with the MIU) is used to connect the units together.

Units supplied in dX and dT size enclosures require a power supply to operate the power switching contacts.

For the dX size units, the supply should be connected to the N and 115 or 230 terminals, for 115 or 230 volt supplies respectively. For the dT enclosure, connect the supply to the L and N terminals, and select the appropriate supply voltage using the voltage selector switch.

Versions supplied for 24 volt DC supplies only have terminals marked + and for supply voltage connection.

Refer to the drawings section of this handbook for the wiring schematic of the unit you are installing.

ML303 v3 29 April 2003 Page 5 of 7

MAINTENANCE Periodically: Suggest at a minimum of every six months. There are no user serviceable parts within the MIU system apart from those

mentioned in this handbook. Repeat the commissioning tests to check correct operation of the system. Check that the air supply quality, where applicable, is still acceptable. Check that the system has not been modified in an unauthorised manner. Check that the certification labelling is legible and that the system is suitable for

the hazardous location. COMMISSIONING Once the MIU has been installed, check that all terminals are tight, the cable entries

are correctly installed and the pneumatic connections to the MiniPurge are tightened.

If the commissioning is being carried out in the Hazardous Area, appropriate precautions must be taken to prevent an explosion. The relevant Hot Work Permit or similar must be obtained and appropriate regulations followed.

Commissioning the MIU requires a working purged enclosure and MiniPurge system. For operation and commissioning instructions for the MiniPurge system, refer to the appropriate handbook supplied with the MiniPurge. The description below assumes a standard Leakage Compensation MiniPurge is in use.

Operation of the Alarm / Pressurized contact can be tested as follows: With the air supply turned off, there should be continuity between the A and C

terminals, and no continuity between the C and P terminals. Close the enclosure door, and turn the air supply on, to pressurize the enclosure.

The purge should begin, and the Pressurized indicator on the MiniPurge should change from Red to Green. There should now be continuity between the C and P terminals, and no continuity between the C and A terminals of the MIU.

Operation of the power switching contacts can be tested as follows: With the air supply off, the power switching contacts should be open circuit.

Remember to turn on the power supply, for units that require a power supply to control the switching (dX and dT size units).

Close the enclosure door. Turn on the air supply. The purge cycle should begin. Once the purge cycle has been completed the power switching contacts will close.

Both pneumatic connections between the MiniPurge and MIU are now pressurized, so now check the pneumatic connections for leaks.

ML303 v3 29 April 2003 Page 6 of 7

FAULT FINDING Refer to the table below to solve any malfunction. Problem Potential Cure The Alarm / Pressurized contact fails to operate.

Check the pneumatic connection from the MiniPurge for leakage / blockage.

Check the operation of the pneumatic feed through as follows:

Unscrew the air connection to the feed through on the side of the MIU, and use a small terminal screwdriver to manually depress the piston inside the feed through.

Pressing the piston should transfer the motion to the switch within the MIU, and the change-over action of the switch should be observed with a continuity tester.

The power switching contacts do not close. (dA MIU units)

The contactor is directly operated by the pneumatic feed through. Operation should be tested as outlined for the alarm contact above.

The power switching contacts do not close (dX and dT Units)

Check that there is power supplied to the MIU Check operation of the pneumatic feed through as

above for the Alarm/ Pressurized contact. Check the voltage selection matches that of the

supply Check the fuse in the MIU. (Refer to the circuit

diagram for the fuse rating.) CERTIFICATES See attached Certificates: Sira 02ATEX1129 DRAWINGS AND DIAGRAMS See attached drawings: TITLE Drawing Number MIU/dA Schematic Diagram AGE-WC00-092 MIU/dA Enclosure Dimensions MEN-DBG0-001 MIU/dX Schematic Diagram AGE-WC00-091 MIU/dX Enclosure Dimensions MEN-DBG0-003 MIU/dT Schematic Diagram AGE-WC00-083 MIU/dT Enclosure Dimensions MEN-DBG0-002 Cat 5 Network Connections

ML303 v3 29 April 2003 Page 7 of 7

PROJECT SPECIFIC DATA Recorded below are the drawing numbers detailing items specific to the project the MIU is supplied to.

Drawing Number

Title

1

2

3

4

5

6

7

8

9

Connections for Cat 5 UTP Network Cabling

View of RJ 45 Plug looking onto the pin ends Pin Number Pin Function Wire Colour* 1 TX+ Transmit data + White/Orange 2 TX- Transmit data - Orange 3 RX+ Receive data + White/Green 4 No connection Blue 5 No connection White/Blue 6 RX- Receive data - Green 7 No connection White/Black 8 No connection Black * Wire colours are not necessarily common to all cable varieties. Always check the pinout of the connector. Transmit and receive are noted as data flows out of the network interface card on the PC. Obviously, Transmit and Receive are the reverse on the hub.

1 5 7 8 6 4 32

Expo Technologies Ltd., Tel + 44 (0) 20 8398 8011 Summer Road, Fax + 44 (0) 20 8398 8014 Thames Ditton, E-mail: sales@expoworldwide.com Surrey, England, KT7 0RH Expo Technologies Inc., Tel: (440) 247 5314 PO Box 486, Fax: (440) 247 5409 Chagrin Falls, E-mail: sales.na@expoworldwide.com Ohio 44022-0486, USA

www.expoworldwide.com