20 • 35-3001A-09 Oxygen/Hydrogen Sulfide Sample-Draw Detector
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.
Figure 7: Inlet Fitting with Tubing Stub
CAUTION:
Do not pull the tubing stub downward to remove it.
1. Remove the particle filter’s 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 25 for the spare part
number.
3. Push the tubing stub up and out of the front ferrule being careful not to lose the ferrule set. If
you do lose the ferrule set or if it is damaged, see “Parts List” on page 25 for the spare part
numbers.
1/4" Tube
Back Ferrule
Front Ferrule
Fitting Body
Outside of Case
1/4" Tube
O-ring
Tube Nut
Inside of Case
