RKI Instruments 35-3000RK-LEL - Manual (Page 12)

12 • 35-3000RK-LEL Combustible Gas Sample-Draw Detector
5. Connect the cable shield to an available chassis ground at the controller. The
grounding screw on one of the controller’s grounded conduit hubs is an example of a
chassis ground.
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 wiring is correct and secure. Refer to the controller operator’s manual
for connections at the controller.
3. Turn on or plug in the power to the controller, then turn on the controller.
4. Verify that the sample-draw detector’s PILOT light is on.
5. Verify that the controller is on and operating properly. Refer to the controller
operator’s manual.
6. Verify that the flowmeter indicates a flow rate of approximately 1.5 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 will cause a low
flow condition at the sample-draw detector and a fail condition at the controller.
Be sure to put the controller into its calibration program or disable external
alarms before performing this test.
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, verify that the flowmeter returns to a
normal flow rate.
9. Enable alarms or place the controller in normal operation.
CAUTION: Allow the sample-draw detector to warm up for 15 minutes before you continue with
the next section, “Setting the Zero Reading.”
Setting the Zero Reading
CAUTION: If you suspect the presence of combustible 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. See “Calibration” on page 18 for
instructions on using a zero air calibration cylinder for setting the zero reading.
1. Verify that the sample-draw detector is sampling a fresh air environment
(environment known to be free of combustible gas).
2. Verify a reading of 0 %LEL on the controller display screen for the applicable channel.
If the display reading is 0 % LEL, start up is complete. The sample-draw detector is in
normal operation. If the display reading is not 0 % LEL, continue with step 3.