Start up – RKI Instruments 65-2424RK User Manual
Page 10
6 • 65-2424RK H
2
S Transmitter
9.
If shielded cable is used, connect the cable’s drain wire to an available chassis (earth)
ground at the controller. RKI controllers typically have a ground stud that can be used
to ground the cable’s drain wire.
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 operator’s manual.
3.
Turn on or plug in the incoming power to the controller, then turn on the controller.
4.
Verify that the controller is on and operating properly. Refer to the controller
operator’s 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
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.
Remove the enclosure’s cover by unscrewing the four cover screws, one at each
corner.
2.
Set a voltmeter to measure in the millivolt (mV) range.
3.
Plug the voltmeter leads into the test points on the amplifier PCB. Plug the positive
lead into the test point labeled CAL+; plug the negative lead into the test point labeled
CAL-
.
4.
Screw the regulator into the zero air calibration cylinder.
5.
Use the sample tubing to connect the regulator to the calibration cup.
6.
Turn the regulator’s on/off knob counterclockwise to open it.
7.
Hold the calibration cup against the H
2
S sensor’s face. Leave the rubber boot and
sealing spacer on the sensor when calibrating. Hold the cup on gently to allow gas to
escape and avoid pressurizing the sensor’s sensing face.
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 zero pot until the voltmeter