35-3001-06H-DIL Hydrogen/Oxygen Sample-Draw Detector • 17
12. Calibrate the replacement sensor as described in “Calibration, Oxygen Sensor” on page 21.
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 0.8 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:
1. Disconnect the tubing routed to the sampling area, if installed, from the particle filter.
2. Disconnect the particle filter from the tubing stub.
3. Install the new particle filter onto the tubing stub. Be sure the arrow on the particle filter is
pointing toward the inlet fitting.
4. Reinstall the tubing routed to the sampling area.
4. If the particle filter is installed at the end of the inlet line:
1. Remove the particle filter from the tubing stub.
2. 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 1.0 SCFH (±0.1). To adjust the low flow setting:
1. Install a 0-2 SCFH flowmeter with an adjustment valve at the inlet of the sample-draw
detector.
NOTE:
RKI Instruments, Inc. offers a 0 - 2 SCFH flowmeter but tubing connection fittings must
be user installed to the flowmeter’s 1/8” NPT female fittings.
2. Use the inlet line flowmeter’s adjustment valve to set the inlet line flow to 1.0 SCFH.
