Portable Gas Monitor (PGM-IR) Infrared Sensor Replacement
Instruction 3015-5508 (Rev 2)
5
5. Install the New IR Sensor
Step
Description
12.
Record calibration label information (found on the new IR sensor) into Table 2 for use
later in this procedure. Refer to Figure 6. Note that calibration information is
dependent on the gas type supported by the IR sensor. For example, refrigerant and
SF
6
sensors use a single calibration parameter (TEMPCO). CO
2
sensors use five
parameters.
Figure 6. Sample IR Sensor Labels: Refrigerant and SF
6
(Left); CO
2
(Right)
Table 2: Calibration Parameters Worksheet
All Sensors
CO
2
Only
TEMPCO
LOTEMP
HITEMP
LOKCAL
HIKCAL
13.
To begin the installation of the new IR sensor, remove the protective caps from the
gas-inlet and gas-outlet fittings on the new IR sensor.
14.
Position the new sensor inside the chassis so that the end with the 12-pin electrical
connector (IR Source) is located on the
right
, and that the gas fittings are facing
upwards.
15.
Reconnect the tubing that was removed in step 8 to the gas-inlet and gas-out fittings
on the IR sensor.
16.
Plug the 12-conductor ribbon cable from IR SOURCE connector J5 on the main board
into the 12-pin IR emitter connector.
17.
Plug the 10-conductor ribbon cable from DET connector J6 on the main board into the
10-pin IR sensor connector.
18.
Using the two cable ties supplied in the kit, secure the sensor to the cable-tie mounts
on the side wall of the chassis. Note that the 12-conductor ribbon cable is secured in
place by positioning it under the cable tie. Cut off any cable-tie excess.
19.
Check to ensure that the new IR sensor is properly secured, and that all tubing and
electrical connectors are tight.
20.
Reconnect the tubing from the purge-air bag onto its tee-fitting. (This step does not
apply to models without the purge air bladder bag.)
21.
Connect the battery pack to the monitor’s battery connector, and then turn ON the
monitor.
22.
Allow the monitor to warm-up for at least ½ hour before proceeding.
