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MPD Operating Manual

2.5 Fitting Sensors

WARNING

Before installing the sensors, isolate the power supply by disconnecting or

removing the associated control module from the installation.

CAUTION

• The sensitivity of catalytic sensors is impaired by silicone compounds. Do not

expose the sensors to silicones or silicone-based products.

• The sintered disc on the sensor assembly must be kept free from containments;

i.e. oil and dirt.

• The relevant site procedures must be obeyed at all times when opening the

Terminal Housing or removing the sensor in a hazardous areas.

If replacing a sensor refer to CAUTION 1 in Section 4 - Maintenance.

To t the MPD proceed as follows:

1. Remove the protection disc and t the accessories as required. (Refer to

Section 3 - Fitting Accessories).

2. Isolate the power supply and wait for ve minutes.

3. Remove the Terminal Housing lid.

4. Pass the cable into the Terminal Housing and t the sensor to housing.

To comply with the certication requirements, a minimum of ve threads

must be engaged.

5. Connect the sensor cable to the terminal block. (See the label adjacent

to the connector).

6. After mounting the Terminal Housing in the required location, connect the

associated Control Module wiring to the terminal block (see the label).

7. Replace and secure Terminal Housing lid.

8. If not already replaced by accessories, unscrew the Filter Housing, remove

the protection disc and replace Filter Housing and gasket.

NOTe

The Hydrophobic Barrier is retained in position by the Filter Housing, or

one of the accessories.

9. Connect power supply to the Sensor by reconnecting or replacing the

associated Control Module.

10. Calibrate the system as detailed in the equipment manual.

NOTe:

Calibration of the MPD is mandatory before the detector can be used for

gas monitoring. Refer to Section 7 - Calibration for the proper procedure.

Honeywell MPD Series User Manual

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