25 Fitting Sensors 15 - Honeywell MPD Series Operating Manual

25 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 fit the MPD proceed as follows:
1. Remove the protection disc and fit the accessories as required. (Refer to
Section 3 - Fitting Accessories).
2. Isolate the power supply and wait for five minutes.
3. Remove the Terminal Housing lid.
4. Pass the cable into the Terminal Housing and fit the sensor to housing.
To comply with the certification requirements, a minimum of five 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.
MPD Operating Manual 15