RKI Instruments 35-3010RKA-01 User Manual
Page 28
24 • 35-3010RKA-01 Sample-Draw Detector
1.
Open the housing door.
2.
Set a voltmeter to measure in the millivolt (mV) range. It will be used in the
calibration of the CO and H
2
S channels.
•
When checking the mV output of the CO channel, plug the voltmeter leads into
the test points in the AMP 1 section of the main circuit board. Plug the positive
lead into the test point labeled CAL+1; plug the negative lead into the test point
labeled CAL-1.
•
When checking the mV output of the H
2
S channel, plug the voltmeter leads into
the test points in the AMP 2 section of the main circuit board. Plug the positive
lead into the test point labeled CAL+2; plug the negative lead into the test point
labeled CAL-2.
3.
Use the following formula to determine the correct test points output for the CO and
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 1 and AMP 2 test points for
the CO and H
2
S channels 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 or 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 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.
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.
7.
If necessary, use the AMP 2 span pot to adjust the reading to match the correct