RKI Instruments GD-K7D2 (24 VDC) User Manual
Page 19
Model GD-K7D2 (24 VDC) Sample Draw Transmitter • 15
Performing the response test
NOTE:
This procedure describes a response test using the RKI calibration kit that
incudes a “demand flow” regulator. A calibration kit that uses a gas collection
bag is also available. Contact RKI Instruments, Inc., for more information
concerning the gas collection bag accessory.
1.
Disconnect the incoming Teflon sample tubing from the sample filter.
2.
Connect the calibration kit sample tubing from the regulator to the sample filter.
The GD-K7D2’s pump automatically begins pulling the gas from the calibration
cylinder when you connect the GD-K7D2’s sample filter to the regulator.
3.
Allow gas to flow for two minutes and verify the reading is within ± 20% of the
response reading you determined earlier.
NOTE:
If the reading is not within ± 20% of the correct response reading, calibrate the
GD-K7D2 as described in the Calibration section of this manual.
4.
Disconnect the calibration kit sample tubing from the sample filter.
5.
Disconnect the calibration kit sample tubing from the regulator, then remove the
milliampmeter test clips from the output check pins.
6.
Reinstall the incoming Teflon sample tubing to the sample filter.
7.
Slide the cover over the detection unit and installation bracket, then tighten the
thumbscrew at the front of the cover to secure it.
8.
Disassemble the calibration kit as described in the Calibration section of this insert.
9.
Allow time for the gas reading to return to normal and return the controller to normal
operation.
NOTE:
If the gas reading does not return to normal before returning the controller to
normal operation, unwanted alarms may occur.
Quarterly/Biannually
Calibrate the GD-K7D2 as described in the Calibration section of this manual. The
calibration frequency (every 3 to 6 months) depends on your specific application.
Troubleshooting
The troubleshooting guide describes symptoms, probable causes, and recommended
action for problems you may encounter with the GD-K7D2.
Fail Condition
Symptoms
•
The GD-K7D2’s flow light is off.
Probable causes
•
The GD-K7D2 wiring to the controller is disconnected or misconnected.
•
The 24 VDC to the GD-K7D2 is interrupted.
•
The GD-K7D2’s flow rate is too low because of an obstructed sample line, failed
pump, etc.