8 • 65-2321RK Oxygen Transmitter
Start Up
This section describes procedures to start up the oxygen 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 power to the controller.
4.
Turn on the controller.
5.
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, “Verifying/Setting the Fresh Air Reading”.
Verifying/Setting the Fresh Air Reading
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 red + test point; plug the negative lead into the black - test point.
4.
Screw the calibration cup onto the bottom of the oxygen 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 two minutes.
9.
Verify a voltmeter reading of 434 mV (±2 mV).
10. If necessary, use a small flat-blade screwdriver to adjust the span pot until the
voltmeter reading is 434 mV (±2 mV).
11. Turn the regulator’s on/off knob clockwise to close it.
12. Unscrew the calibration cup from the detector.
13. Unscrew the regulator from the zero air calibration cylinder. For convenience, leave
the sample tubing connected to the regulator and the calibration cup.
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