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Maintenance
b) Disconnect the particle filter from the tubing stub.
c) Install the new particle filter onto the tubing stub. Be sure the arrow on the particle
filter is pointing toward the inlet fitting.
d) Reinstall the tubing routed to the sampling area.
4. If the particle filter is installed at the end of the inlet line, perform the following:
a) Remove the particle filter from the tubing stub.
b) Install the new particle filter onto the tubing stub. Be sure the arrow on the particle
filter is pointing toward the inlet line.
5. Turn on power to the controller.
6. Turn on the controller.
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
clockwise to increase the flow and counterclockwise 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 clockwise 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
counterclockwise 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.
