Airtightness test

If the sampling pump is not airtight, measurements will not yield correct results. Before starting with the measuring, be sure to verify that the sampling pump is really airtight.

Testing procedure

1 First, confirm that the inlet nut is not loose.



2 Insert a detector tube (with both tips intact) into the rubber tube inlet of the sampling pump



3 With the handle fully pushed in, align both of the guide marks (red line + triangle) on the pump (tail-end block) and the handle (100).




4 Pull out the handle in one thrust until it is locked, and then remove your hand (from the handle). Wait until the sampling time (approx. 1 minute) has elapsed.



5 Grasp the handle and turn it 90 degrees. If the pump is completely airtight, the handle should readily return to its original position; with the handlefs demarcation line read line fully concealed.



Note)
When you return the piston, please ease it back gradually (lightly holding on to it so it does not snap back in one thrust. (Since there is a vacuum inside the cylinder, the handle tends to return rapidly). If it snaps back too hard, the impact can damage the pump causing it to malfunction.

When the airtightness test does not provide the desired result,
Primary causes of leakage in gas sampling pumps are looseness of the inlet nut, porosity of the inlet rubber, impure or insufficient sealing grease, etc. Please perform the necessary maintenance according to the procedures described in the sampling pump instructions manual. If the pump still leaks after performing the maintenance procedures according to the manual, immediately discontinue use, and contact your authorized GASTEC representative.


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