14 • 35-3001-05-XX CO
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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 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 LED 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 1.0 SCFH. If necessary, use the sensor
flow control valve to adjust the flow rate. Turn the valve’s knob counterclockwise to increase the flow
and clockwise to decrease the flow.
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, press and hold the reset
switch and 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, release the reset switch, and verify 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 5 minutes before you continue with the next
section, “Setting the Zero Reading.”
Setting the Zero Reading
Since there is a background of CO
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in air of typically 300 - 600 ppm (0.03 - 0.06% volume), it is necessary
to use a calibration kit with a 100% nitrogen cylinder to set the zero signal for the
0 - 5,000 ppm and 0 - 5% volume versions. Fresh air can be used to set the zero signal for the
0 - 50% and 0 - 100% volume versions.
1. Screw the demand flow regulator into the 100% nitrogen calibration cylinder.
2. Connect the calibration tubing from the demand flow regulator to the inlet fitting. Gas will begin to
flow.
3. Allow the sample-draw detector to draw sample for one minute.
4. Verify a reading of 0% vol on the controller display screen for the applicable channel.
If the display reading is 0% vol, start up is complete. The sample-draw detector is in normal operation.
If the display reading is not 0% vol, continue with step 5.
5. Perform a zero operation at the controller. See “Setting the Zero Reading” on page 20 and the controller
operator’s manual for instructions to perform a zero operation.
6. Remove the calibration tubing from the inlet fitting, then reconnect the sample tubing to the inlet fitting.
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