22 • 35-3001A-04-02 Carbon Monoxide Sample-Draw Detector
Adjusting the Low Flow Setting
NOTE:
Adjusting the low flow setting will cause a low flow alarm at the sample-draw detector
and a fail alarm at the controller. Be sure to put the controller into its calibration program
or disable external alarms before performing this test.
The factory-set low flow setting is 0.6 SCFH (±0.1). To adjust the low flow setting:
1. Use the sensor flow control valve to set the flow to 0.6 SCFH. Turn the valve’s knob
counterclockwise to increase the flow and clockwise to decrease the flow.
If the sample-draw detector goes into low flow alarm before you can adjust the flow down to
0.6 SCFH, adjust the pressure switch adjustment screw 1/4 turn clockwise, then attempt to set
the flow again. Repeat this step until you are able to adjust the flow to 0.6 SCFH.
NOTE:
The pressure switch adjustment screw is accessible through a circular cutout in the
flowmeter circuit board.
2. Slowly turn the pressure switch adjustment screw counterclockwise just until the sample-draw
detector goes into low flow alarm.
3. Turn the sensor flow control valve’s knob counterclockwise to increase the flow until the unit
is out of low flow alarm when the reset switch is pressed and released.
4. Decrease the flow very slowly by turning the sensor flow control valve’s knob clockwise and
verify that the low flow alarm is 0.6 SCFH (±0.1).
If the low flow alarm is set too high, turn the pressure switch adjustment screw slightly
clockwise. Repeat steps 3 and 4 if necessary.
5. Use the sensor flow control valve to set the flow to 1.0 SCFH.
6. Make sure the sample-draw detector’s Fail LED is off.
