35-3010A-11 Sample-Draw Detector • 21
7.
Secure the retaining plate to the standoffs with the two screws you removed in step 3.
8.
Turn on incoming power.
9.
Calibrate the replacement sensor as described in “Calibration, LEL Detector” on
page 23.
Replacing the Hydrogen Sulfide Sensor
1.
Turn off incoming power.
2.
Open the housing door of the sample draw detector.
3.
Unscrew the 5 screws that retain the preamp circuit board.
4.
Lift the preamp circuit board away from the flow block.
Be careful not to pull on the cables that connect the preamp circuit to the main circuit
board.
There is a foam gasket in the bottom of each flow cavity beneath the circuit board.
Make sure the gaskets stay in place.
5.
Pull the H
2
S sensor off the preamp circuit board. It is located in the amp 2 position
(right side) of the preamp circuit board.
6.
Plug the new sensor into the preamp board.
7.
Reinstall the preamp circuit board with the sensors onto the flow block.
8.
Turn on incoming power.
9.
Calibrate the replacement sensor as described in “Calibration, H
Replacing the IR CO
2
Sensor
1.
Turn off or unplug incoming power.
2.
Unscrew the four screws that hold the circuit board on the flow block.
3.
Pull the circuit board off the flow block.
4.
Unplug the infrared detector from the circuit board.
5.
Plug the new detector into the circuit board.
6.
Reinstall the circuit board to the flow block.
7.
Turn on or plug in power.
8.
Calibrate the replacement sensor as described in “Calibration, H
Replacing the Hydrophobic Filter
1.
Turn off or unplug power to the controller.
2.
Locate the hydrophobic filter. It is just to the left of the main circuit board.
3.
Grasp the hydrophobic filter and pull it out of its metal clamp.
4.
Remove the rubber seals from each end of the hydrophobic filter and remove the
filter.
5.
Place the new hydrophobic filter in the same orientation as the one that was removed.
6.
Place the new hydrophobic filter back into the metal clamp.
