RKI Instruments 35-3010RKA-08 - Manual (Page 23)

35-3010RKA-08 Sample-Draw Detector • 19
Replacing the Charcoal Filter
NOTE: The charcoal filter does not normally need to be replaced in the 35-3010RKA-08
because it does not include a CO sensor.
1. Turn off or unplug power to the controller.
2. Locate the charcoal filter. It is located along the upper edge of the detector housing.
3. Grasp the charcoal filter and pull it out of its metal clamp.
4. Remove the rubber seals from each end of the charcoal filter and remove the filter.
5. Place the new charcoal filter in the same orientation as the one that was removed.
6. Place the new charcoal filter back into the metal clamp.
Adjusting the Low Flow Setting
The factory-set low flow setting is 0.6 SCFH (±0.2). To adjust the low flow setting:
1. Use the flow adjust potentiometer (VR1) to set the flow to 0.6 SCFH.
If the sample-draw detector goes into low flow alarm before you can adjust the flow
down to 0.6 SCFH, adjust the low flow potentiometer 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.
2. Slowly turn the low flow potentiometer counterclockwise just until the sample-draw
detector goes into low flow alarm.
NOTE: The low flow potentiometer is accessible through a circular cutout in the main
circuit board. The cutout is labeled PS1.
3. Verify that the low flow alarm is 0.6 SCFH (±0.2). Repeat steps 3 and 4 if necessary.
4. Use the flow adjust potentiometer (VR1) to set the flow to 1.2 SCFH.
5. Make sure the sample-draw detector’s Fail light is off.
Calibration Frequency
Although there is no particular calibration frequency that is correct for all applications, a
calibration frequency of every 3 months is adequate for most sample draw detector
applications. Unless experience in a particular application dictates otherwise, RKI
Instruments, Inc. recommends a calibration frequency of every 3 months for the oxygen
sensor and every 6 months for the IR CH
4
sensor in the sample draw detector.
If an application is not very demanding, for example detection in a clean, temperature
controlled environment, and calibration adjustments are minimal at calibration, then a
calibration frequency of every 6 months for the oxygen sensor and every 12 months for the
IR CH
4
sensor is adequate for the sample draw detector.
If the application is very demanding, for example if the environment is not well
controlled, then more frequent calibration than every 3 months for the oxygen sensor and
every 6 months for the IR CH
4
sensor may be necessary for the sample draw detector.