Probebrochure rev8

5/24/2018 Probebrochure rev8

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Outotec Pty Ltd Australian Service Centre

28 Rodborough Rd, Frenchs Forest NSW 2086 Page 1of 7Level 2, 1 Walker Street, West Perth WA 6005 www.outotec.comABN 7400 3491 165

OUTOTEC PTY LTDBED LEVEL DETECTION PROBE BLD-2000 SERIES

The BLD - 2000 series Bed Level Probes are constructed of 316L or 904L StainlessSteel, and therefore are resistant to corrosion.

They consist of a sealed stainless steel tube and circuit boards with a Reed SwitchRelay Matrix housed inside.

The output is a 0 -10 k-ohm resistance. This is then converted using a resistancetransmitter to produce a 4-20 mA signal.The 4-20 mA signal is transmitted back to the Control Room, where it is used tocontrol the speed of the flocculant dosing pumps.As the Bed Level increases, the pump speed is increased and vice-versa to maintaina constant level. These levels are important in the control of overflow clarity.

A Derakain Fibreglass cone-shaped float has been designed to promote self-cleaningand to reduce the build up of solids. The float has a hole through its axis with magnetsalong its inner sleeve. The float slides up and down the stainless steel tube probewhilst floating on the bed. The magnets activate the Reed Switches installed insidethe probe. The Probe has PVC stops, both in the lower and upper positions to preventthe float from falling out of range.

By filling the cone float with water, it is weighted so it sinks very slowly in a bucket ofProcess water. Therefore, it will float on any solids, giving an indication of the BedLevel.

The probe position is critical to the operation of the Thickener. The ideal location is atmidpoint between the Launder and the Feedwell outer lip. The unit should be at alevel where the bottom of the Probe is level with the bottom of the Deflector Cone.

The units are available in the following standard sizes that suit most applications.However, any size or range can be built to suit the Clients requirements.

The part numbers and descriptions are as follows:

Model Description Part Number3.0-316-1.0 3.0m long, SS Gr 316 material, 1.0 m

sensing range.S.T.BL.3000.1000.316

4.0-316-1.5 4.0m long, SS Gr 316 material, 1.5 msensing range.

S.T.BL.4000.1500.316

Standard Derakain Cone Float S.T.BL.CF


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Typical wiring diagrams


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ASSEMBLY PROCEDURE

The Bed Level Detection Probe BLD-2000 Series is delivered in a

two-piece configuration. The lower section (with wire attached) contains theelectronics and is Fragile; therefore extra care should be taken whenunpacking this unit. The upper section is a hollow tube.

Whilst the lower section is fully sealed to IP65 standards, it is recommendedthat as part of these assembly instructions the Female threaded section befilled with Silicone or equivalent sealant, and the Male threaded section beTeflon taped, before connecting the two components - this ensures anadditional seal for the electronic housing section.

ASSEMBLY

1. Remove the cable ties and unroll the cable.

2. Feed the cable through the hollow "upper" tube.

3. When the cable is fed completely through the upper tube, apply Teflontape to the threaded male section on the upper tube and screw the twocomponent parts together.

4. Then fill the threaded female section on the "sensor" tube with siliconsealant. It is imperative that the join area be sufficiently sealed to reduceany possibility of contamination to the electronics during operation.


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5. Finally, fit the rubber boot at the top of the upper tube (where the cableexits). This will stop rain and dust from entering the upper section of theProbe.

The Probes are tested and calibrated prior to delivery. However, they should berechecked upon installation as follows:

* Before lowering the Probe into position, remove the lower bolt, locking nut andwashers.

* Loosen and remove the lower PVC collar.* Place the weighted Cone Float over the Probe, (pointy end up). If float has not

been weighted with process water, remove the bolt from the bottom and fill withenough process water so that when in a container of process water, the floatsinks slowly. Refit the bolt.

* Refit the PVC collar, bolt etc.* Lay the Probe across the bridge handrails and connect the wiring to the control

panel.* Move the float between the two PVC collars, monitoring the output on the

Control Panel display.* The output is 4-20 mA and should be displayed as 0 - 100%. If, when fully

raised, the signal drops out of range (i.e. gets to 100% and returns to 0%) thenthe PVC collar should be lowered so that the float does not exceed this range.

* There are Spanand Zerobuttons located on the Resistance Transmitter tocalibrate the 0 - 100% range.

When complete, install the Probe in its correct position ensuring that it is notpositioned lower than the original install - the bottom of the Probe should be level withthe lowest point of the Deflector Cone.

Note: The Cable entry end of the Probes are design to be IP 65 NOT fully

submersible. Any damage caused by submersing, dropping or failure to complywith assembly procedure is not covered by Warranty.

Probes are manufactured in Australia

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Probebrochure rev8