RKI Instruments GD-K7D2 (24 VDC) - Manual (Page 25)

Model GD-K7D2 (24 VDC) Sample Draw Transmitter • 21
Setting the Zero Reading
1. Connect the calibration kit sample tubing from the sample filter to the regulator.
NOTE: The GD-K7D2 pump automatically begins pulling the calibrating sample from
the calibration cylinder when the calibration kit is completely assembled and
connected to the GD-K7D2’s sample filter.
2. Allow the GD-K7D2 to draw gas for two minutes and verify a reading of 4.0 mA. If
necessary, use the zero pot to adjust the reading to 4.0 mA.
3. Disconnect the calibration kit sample tubing from the regulator, then unscrew the
regulator from the zero air calibration cylinder.
Leave the calibration kit sample tubing connected to the sample filter.
Setting the Response Reading
1. Screw the regulator into the calibration cylinder.
2. Connect the calibration kit sample tubing from the GD-K7D2’s sample filter to the
regulator.
3. Allow the GD-K7D2 to draw gas for two minutes and verify that the reading matches
the response reading you determined earlier. If necessary, use the span pot to adjust
the reading to match the correct response reading.
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. Unscrew the regulator from the calibration cylinder.
8. Slide the housing cover over the GD-K7D2, then tighten the thumbscrew at the front
of the cover to secure it to the GD-K7D2.
9. Allow time for the gas reading to return to normal, then 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.
10. Store the components of the calibration kit in a safe and convenient place.
11. Verify that the controller display reading decreases and stabilizes at 0 PPM.