RKI Instruments 65-2442RK User Manual
Page 17
65-2442RK PPM Hydrogen Transmitter • 13
15. Allow the replacement detector to burn-in for at least 5 days before you continue with
the next step. A burn-in period of 7 days is recommended.
16. After the burn-in period, set the load voltage as described in “Setting the Detector
Load Voltage” on page 13.
17. After setting the load voltage, calibrate the transmitter as described in “Calibration”
on page 15 of this manual.
Setting the Detector Load Voltage
The detector load voltage must be reset when the detector or amplifier is replaced or if
you suspect that it has been changed from the factory setting for your detection range.
This procedure involves setting a voltage while applying calibration gas to the detector
that matches the full-scale concentration for the transmitter. After replacing the detector or
amplifier as described earlier in this manual, the following procedure must be completed
before calibrating the sensor. Be sure to follow the timing recommendations in “Replacing
the PPM Hydrogen Detector” on page 10 and “Replacing the Amplifier” on page 11 for
setting the load voltage.
WARNING: The controller is not an active gas monitoring device during the load
voltage setting procedure.
NOTE:
The following procedure assumes the use of a calibration kit which includes a
calibration gas cylinder equal to the transmitter’s full scale gas concentration, a
0.5 LPM fixed flow regulator with an on/off knob, a calibration cup for the
detector, and a humidifier tube to connect the regulator to the calibration cup.
1.
Screw the calibration cup onto the bottom of the hydrogen detector.
2.
Use the humidifier tube to connect the regulator to the calibration cup.
3.
Set a voltmeter to measure in the DC volt range.
4.
Remove the junction box cover.
5.
Remove the screw, flat washer, and lock washer retaining the amplifier to the junction
box, and carefully lift the amplifier to gain access to the load voltage adjustment pot.
See Figure 1 for the pot location.
6.
Screw the regulator into the calibration gas cylinder. The cylinder must be equal to the
transmitter’s full scale gas concentration.
7.
Turn the regulator knob counterclockwise to open the regulator.
8.
Allow the calibration gas to flow for one minute.