MicroRAE User’s Guide
46
The LEL sensor is square and has four pins that insert into four plated holes in the PC board.
When removing or installing an LEL sensor, lift it straight out and be careful not to bend the pins.
13.2.
Replacing Sensors
1.
Install the replacement sensor. Make sure the electrical contact pins are aligned with the
holes in the PC board and that the sensor is seated firmly.
2.
Remove the plastic film from the top of the sensor.
3.
Replace the cover and tighten the four screws.
WARNING!
It is extremely important that sensors are installed in the correct orientation.
When installing a new sensor, the plastic film should be on top of the sensor. Once the sensor is
installed, remove the plastic film.
IMPORTANT!
Always perform a full calibration after replacing sensors.
13.3.
Replacing The LEL Filter
If the LEL sensor appears dirty, it should be replaced with a new one (H
2
S filter P/N: 014-3603-
005, package of 5; or H
2
S & Si filter P/N: 014-3604-005, package of 5).
1.
Remove the LEL filter from the gasket and dispose of it.
2.
Replace the LEL sensor in its place in the gasket.
LEL
Sensor
