RKI Instruments 65-2435RK - Manual (Page 10)

10 • 65-2435RK CO Transmitter
Start Up
This section describes procedures to start up the CO 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
CAUTION: If you suspect the presence of the target gas in the monitoring environment, use the
calibration kit and the zero air calibration cylinder to introduce “fresh air” to the
sensor and verify an accurate zero setting.
1. Verify that the transmitter is in a fresh air environment (environment known to be free of
carbon monoxide, other toxic and combustible gases and of normal oxygen content, 20.9%).
2. Unscrew and remove the junction box cover from the junction box.
3. Set a voltmeter to measure in the millivolt (mV) range.
4. 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-.
5. Verify a voltmeter reading of 100 mV (±2 mV).
6. If necessary, use a flat-blade screwdriver to adjust the zero potentiometer until the voltmeter
reading is 100 mV (±2 mV).
7. Remove the voltmeter leads and secure the junction box cover to the junction box.
Operating With a Background of Hydrogen
The CO sensor in the CO transmitter does respond to hydrogen in addition to CO. The transmitter
has the ability to compensate for this response up to 10,000 ppm hydrogen. If up to 10,000 ppm of
hydrogen is present, the CO transmitter will indicate only the CO concentration.