Gas Detector Pump Operations
How to check the pump for leaks
Insert an unopened tube into the pump inlet and pull a
stroke. After 3 minutes unlock the handle and release
it slowly holding the handle and the pump body
securely. If the handle returns to the red "0 mark" line,
then the pump is leak free and ready to use.
Measurement Procedure
- Break both ends of the tube using the tip
breaker on the sampling pump.
- Insert one end of the tube securely into the
sampling pump inlet, ensuring that the arrow
mark on the tube points towards the pump.
- Rotate the piston shaft until the
red dot on it aligns with the red
dot on the pump body.
- Insert the open end of the tube into the gas to
be sampled and pull the handle 0.5 or 1 stroke
until it locks in place, and wait for the indicated
sampling time. For a second stroke, rotate the
hand 90o, push it back to the 0 mark without
removing the detector tube, and pull the piston
handle for another full stroke. Repeat for the
number of required strokes.
- Remove the tube from the pump and read
the concentration directly on the tube scale.
If tailing occurs read at the midpoint of the
taper. Take the reading within a few minutes of
sampling.
- Check for possible cross-sensitivities.
