RKI Instruments 35-3010RKA-08 - Manual (Page 18)

14 • 35-3010RKA-08 Sample-Draw Detector
Start Up
This section describes procedures to start up the sample-draw detector and place the
sample-draw detector 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. See the controller
operator’s manual.
3. Turn on or plug in the incoming power at the controller, then turn on the controller.
4. Verify that the Pilot light is on at the sample draw detector.
5. Verify that the controller is on and operating properly.
6. Verify that the flowmeter indicates a flow rate of approximately 1.2 SCFH. If
necessary, use the bypass valve or flow adjust potentiometer to adjust the flow rate.
NOTE: The following step tests for leaks in the sample line. This test may cause a low
flow condition at the sample-draw detector.
7. Verify that the incoming sample line is not leaking. To test the sample line, plug the
open end of the sample line with your thumb. If the flowmeter ball drops to the
bottom of the flowmeter, the incoming sample line is not leaking.
8. Remove your thumb from the sample line, press the pump reset switch, and verify the
flowmeter returns to a normal flow rate.
Setting the Zero Reading
CAUTION: If you suspect the presence of combustible gas or an abnormal oxygen condition (not
20.9%) in the monitoring environment, use the calibration kit and the zero air
calibration cylinder to introduce “fresh air” to the sample draw adapter and verify an
accurate zero setting.
1. Verify that the sample-draw detector is sampling a fresh air environment
(environment known to be free of combustible gas, and of normal oxygen content,
20.9%).
2. Open the housing door.
3. Set a voltmeter to measure in the millivolt (mV) range.
4. Plug the voltmeter leads into the transmitter test points.
• For the IR CH
4
channel, plug the voltmeter leads into the test points on the LEL
transmitter. Plug the positive lead into the test point labeled TP+; plug the
negative lead into the test point labeled TP-.
• For the oxygen channel, plug the voltmeter into the test points on the oxygen
transmitter. 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) at the LEL transmitter.
6. If necessary, use a small flat-blade screwdriver to adjust the LEL transmitter’s zero pot
until the voltmeter reading is 100 mV (± 2 mV).
7. Verify a voltmeter reading of 434 mV (± 2 mV) at the oxygen transmitter.