35-3001-13-02 Carbon Dioxide/Oxygen Sample-Draw Detector • 19
CAUTION:
Allow the replacement sensor to warm up for 5 minutes before you continue.
12. Calibrate the replacement sensor as described in “Calibration, Oxygen Sensor” on page 22.
Replacing the Hydrophobic Filter
1. Turn off the controller.
2. Turn off power to the controller.
3. Open the housing door of the sample-draw detector.
4. Disconnect the filter from the rubber elbows on each end of the filter, then remove the filter from the
sample-draw detector.
5. Install the new filter. Be sure the side of the filter marked “INLET” is connected to the elbow that is
connected to the inlet fitting.
6. Turn on power to the controller.
7. Turn on the controller.
8. Verify that the flow rate is approximately 1.0 SCFH, then close the housing door.
Replacing the Particle Filter
1. Turn off the controller.
2. Turn off power to the controller.
3. If the particle filter is installed at the inlet fitting:
a. Disconnect the tubing routed to the sampling area, if installed, from the particle filter.
b. Disconnect the particle filter from the tubing stub.
c. Install the new particle filter onto the tubing stub. Be sure the arrow on the particle filter is pointing
toward the inlet fitting.
d. Reinstall the tubing routed to the sampling area.
4. If the particle filter is installed at the end of the inlet line:
a. Remove the particle filter from the tubing stub.
b. Install the new particle filter onto the tubing stub. Be sure the arrow on the particle filter is pointing
toward the inlet line.
5. Turn on power to the controller.
6. Turn on the controller.
Adjusting the Low Flow Setting
NOTE:
Adjusting the low flow setting will cause a low flow alarm at the sample-draw detector and a fail alarm
at the controller. Be sure to put the controller into its calibration program or disable external alarms
before performing this test.
The factory-set low flow setting is 0.6 SCFH (±0.1). To adjust the low flow setting:
1. Use the sensor flow control valve to set the flow to 0.6 SCFH. Turn the valve’s knob clockwise to increase
the flow and counterclockwise to decrease the flow.
If the sample-draw detector goes into low flow alarm before you can adjust the flow down to 0.6 SCFH,
adjust the pressure switch adjustment screw 1/4 turn clockwise, then attempt to set the flow again. Repeat
this step until you are able to adjust the flow to 0.6 SCFH.
