35-3010RK-02 Sample-Draw Detector • 21
board. Plug the positive lead into the test point labeled CAL+2; plug the negative lead
into the test point labeled CAL-2.
4.
Use the following formula to determine the correct test points output for the H
2
S
calibrating sample.
Output (mV) = (calibrating sample/fullscale) X 400 + 100
For example, with a calibrating sample of 25 ppm H
2
S and a fullscale setting of 100
ppm H
2
S, the correct output for the H
2
S test points is 200 mV.
200 (mV) = (25/100) X 400 +100
Setting the Zero Reading
1.
Screw the regulator into the zero air 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 1 minute.
5.
Verify a voltmeter reading of 100 mV ± 2 mV at the AMP 2 test points for the H
2
S
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 H
2
S
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 zero air cylinder. Leave the sample tubing connected
to the regulator.
Setting the Response (Span) Reading
1.
Screw the regulator into the 4-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 1 minute.
4.
Check the mV output on the AMP 2 test points for H
2
S and verify that the reading
matches the response reading (±2 mV) you determined earlier.
5.
If necessary, use the AMP 2 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.
