Calibration frequency – RKI Instruments 35-3010RKA-03 User Manual
Page 23
35-3010RKA-03 Sample-Draw Detector • 19
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, CO Detector” on
page 23.
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.
Replacing the Charcoal Filter
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 sample