18 • 65-2462RK Hydrogen Transmitter
Zeroing with Background Gas
If the sample area has a background gas that is not N
2
(such as fresh air or helium), you must rezero the
detector while applying that background gas.
1. Screw the regulator into a calibration cylinder containing the background gas (such as zero air or
helium).
2. Turn the regulator knob counterclockwise to open the regulator.
3. Allow the calibration gas to flow for one minute.
4. Verify a voltmeter reading of 100 mV ± 2 mV at the H
2
test points as described in the Preparing for
Calibration section above.
5. If necessary, use a small flat-blade screwdriver to adjust the zero pot for the H
2
channel until the
voltmeter reading is 100 mV ± 2 mV.
6. Turn the regulator knob clockwise to close the regulator.
7. Unscrew the regulator from the calibration cylinder.
Returning to Normal Operation
1. Remove the voltmeter leads from the amplifier test points.
2. Unscrew the calibration cup from the detector.
NOTE:
For convenience, leave the regulator and calibration cup connected by the sample tubing.
3. Secure the junction box cover to the junction box.
4. When the controller display reading falls below the alarm setpoints, return the controller to normal
operation.
5. Verify that the controller display reading decreases and stabilizes at 0% volume.
6. Store the components of the calibration kit in a safe and convenient place.
