Bacharach 2772-0803 manual 8. Mechanical Chassis, 9. Pneumatic Chassis, 10. Pump Types

REMOTE INTELLIGENT SENSOR - AREA MONITOR

4.11.2REMOVAL OF THE MECHANICAL CHASSIS. Remove the cassette, undo the two ribbon cable connectors and the two hose couplings in the tubes that connect the chassis to the body of the instrument. Undo the three (captive) cap head screws that secure the chassis (see Figure 4-8). A 2.5 mm hex key is required for this. The mechanical chassis can now be lifted out.

Figure 4-8. Mechanical Chassis

4.11.3PUMP REMOVAL. Turn the chassis cover and remove three slot head screws (Figure 4-9) to allow the pneumatic chassis to be folded out to give access to the pump. It is not necessary to discon- nect and remove the module.

Carefully disconnect tubes to the pump inlet and outlet. Note original orientation and position, for trouble free reconnecting. Disconnect input wiring, and remove screws holding pump which can now be withdrawn and discarded. Refer to Fig- ure 4-10 which shows both pump types together with the orientation of pump connections.

Figure 4-9. Pneumatic Chassis

4.11.4FITTING THE NEW PUMP. This is a reversal of the procedure detailed above. Take care that the correct pump is fitted and that everything is put back in the original orientation. Make sure that the pump moving parts are free to rotate without anything fouling them.

Figure 4-10. Pump Types

4.11.5REPLACING THE MECHANICAL CHASSIS AND SETTING PUMP FLOW. Care- fully replace the chassis and route the tubes be- tween chassis and body of the RIS as they were originally. Check that the tube connections are oriented correctly. Note, the blue tube (or white in some cases) should be at the top and the green (or clear) one should be at the bottom. Reconnect the ribbon cable connectors, and tighten the three screws.

The cassette can be replaced and power re- stored. Switch on SW1 and press the tape reset button.

Enter the TEST Mode and set the pump flow as described in Section 4.5.

On completion, return the system to service.

4.12 EXTERIOR CLEANING

An occasional wipe with a damp cloth is ad- equate in most circumstances. When oily or sticky deposits build up, a mild detergent solution on the cloth will normally remove them. Clean with the door shut and avoid excessive water. It should not be necessary to clean inside the instrument (except when cleaning the optics block as described in Section 4.10.5).

4.13 KEY PARAMETER CHECKS

It is recommended that the TEST Mode checks are carried out at each cassette change. These are as described in Section 2.8.

It is good practice to record the reading taken on the form provided in the back of this manual. If any value requires adjustment, the reading before and after should be noted. If a system ‘fault’ occurs the TEST Mode parameters at the time should be

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