20 • 35-3001-13-02 Carbon Dioxide/Oxygen Sample-Draw Detector
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.
Removing the Particle Filter’s Tubing Stub, if Necessary
A short tubing stub comes factory installed in the particle filter. It is used for connecting the particle filter to the
inlet fitting. If you have installed the particle filter and no longer want it installed, you will need to remove the
particle filter’s tubing stub from the inlet fitting and replace it with tubing.
CAUTION:
Do not pull the tubing stub downward to remove it.
1. Remove the particle filter from its tubing stub.
2. Unscrew the outside inlet fitting tube nut from the fitting body. The tubing stub should come out with the
tube nut. Be careful not to lose the O-ring that may come out with the tubing stub. If you do lose the O-ring
or if it is damaged, see “Parts List” on page 24 for the spare part number.
Figure 5: Inlet Fitting with Tubing Stub
Outside of Case
Fitting Body
Front Ferrule
Back Ferrule
1/4" Tube
1/4" Tube
O-ring
Tube Nut
Inside of Case
