RKI Instruments 35-3010RK-06-02 - Manual (Page 23)

35-3010RK-06-02 Sample-Draw Detector • 19
Setting the Zero Reading
NOTE: If you can verify a fresh air environment, it is not necessary to use the CO
2
in
nitrogen calibration cylinder to set the zero reading.
1. Screw the regulator into the CO
2
in nitrogen calibration cylinder.
2. Connect the calibration kit sample tubing to the regulator.
3. Connect the sample tubing from the regulator to the inlet line at or near the INLET
fitting.
4. Allow the gas to flow for one minute.
5. Verify a voltmeter reading of 100 mV ± 2 mV at the AMP 1 test points for the CO
channel as described in the Preparing for Calibration section above.
6. If necessary, use a small flat-blade screwdriver to adjust the zero pot for the CO
channel until the voltmeter reading is 100 mV ± 2 mV.
7. Disconnect the sample tubing from the inlet line.
8. Unscrew the regulator from the CO
2
in nitrogen calibration cylinder. Leave the
sample tubing connected to the regulator.
Setting the Response (Span) Reading
1. Screw the regulator into the 3-gas calibration cylinder.
2. Connect the sample tubing from the regulator to the inlet line at or near the sample-
draw detector’s INLET fitting.
3. Allow the calibration gas to flow for one minute.
4. Check the mV output on the AMP 1 test points for CO and verify that the reading
matches the response reading (±2 mV) you determined earlier.
5. If necessary, use the AMP 1 span pot to adjust the reading to match the correct
response reading.
6. Disconnect the sample tubing from the sample-draw detector’s inlet line.
7. Unscrew the regulator from the calibration cylinder.
NOTE: For convenience, leave the regulator connected to the sample tubing.
Returning to Normal Operation
1. Remove the voltmeter leads from the test points.
2. Reconnect the incoming sample line.
3. Wait 1 to 2 minutes to allow the calibration gas to be drawn out and the reading to
stabilize.
4. Close the housing door.
5. Store the components of the calibration kit in a safe and convenient place.