User Manual

18 • 35-3010RKA-06 Sample-Draw Detector
Replacing the Charcoal Filter
NOTE: The charcoal filter does not normally need to be replaced in the 35-3010RKA-06
because it does not include a CO sensor.
1. Tu rn off or unplug power to the contro ller.
2. Locate the charcoal filter. It is located along the upper edge of the detector hou sing.
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 rem oved.
6. Place the new charco al 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 flo w to 0 . 6 SCFH.
If the sample-dra w detector goes into low flow al arm 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 a ga in. 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 in to 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 flo w to 1 . 2 SCFH.
5. Make sure the sample- d raw detector’s Fail light is off.
Calibration Frequency
Although there is no particular calibration frequency that is co rrect for all applications, a
calibration frequency of every 3 months is adequate for mo st sample-draw d e te ctor
applicatio ns. Unless experience in a particular application dictates otherwise, RKI
Instruments, Inc. recommends a calibration frequency of every 3 months for 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, th en a
calibration frequency of every 6 months is adequate.
If the application is very demand ing, for example if the environment is no t well
controlled, then more frequent calibration than every 3 mo nths may be necessary.