RKI Instruments 65-2422RK-05 - Manual (Page 12)

8 • 65-2422RK-05 H
2
S Transmitter
Start Up
This section describes procedures to start up the H
2
S transmitter and place the transmitter
into normal operation.
Introducing Incoming Power
1. Complete the installation procedures described earlier in this manual.
2. Verify that the power wiring to the controller is correct and secure. Refer to the
controller instruction manual.
3. Turn on or plug in the incoming power at the power source end, then turn on the
controller.
4. Verify that the controller is on and operating properly. Refer to the controller
instruction manual.
CAUTION: Allow the transmitter to warm up for 5 minutes before you continue with the next
section, “Setting the Zero Signal”.
Setting the Zero Signal
WARNING: Do not remove the sensor cap or junction box cover while the circuits are
energized unless the area is determined to be non-hazardous. Keep the
sensor cap and junction box cover tightly closed during operation.
NOTE: If you can verify that the detector is in a fresh air environment (environment
known to be of normal oxygen content and free of toxic and combustible gases),
it is not necessary to apply zero air when verifying or setting the fresh air
reading.
The procedure below describes applying zero emission air, usually called zero air, using a
calibration kit that includes a calibration cup, calibration gas, sample tubing, and a fixed
flow regulator with an on/off knob. RKI Instruments, Inc. recommends using a 0.5 LPM
(liters per minute) fixed flow regulator.
1. Unscrew and remove the junction box cover from the junction box.
2. Set a voltmeter to measure in the millivolt (mV) range.
3. Plug the voltmeter leads into the test points on the amplifier. Plug the positive lead
into the test point labeled TP+; plug the negative lead into the test point labeled TP-.
4. Screw the calibration cup onto the bottom of the detector.
5. Screw the regulator into the zero air calibration cylinder.
6. Use the sample tubing to connect the regulator to the calibration cup.
7. Turn the regulator’s on/off knob counterclockwise to open it. Gas will begin to flow.
8. Allow the gas to flow for 2 minutes.
9. Verify a voltmeter reading of 100 mV (±2 mV).
10. If necessary, use a flat-blade screwdriver to adjust the span pot until the voltmeter
reading is 100 mV (±2 mV).
11. Turn the regulator’s on/off knob clockwise to close it.