BD Sensors KHP 4002 User Manual page 18

The max. pressure value depends on the volume of the calibration circuit. Move the fine
adjustment valve (2) until the requested test pressure has been reached precisely (to be
read on the reference instrument)
NOTE: After increasing the pressure, the reading may slightly drop
again for about 30 seconds, which is caused by thermodynamic ef-
fects, the tube connection and the sealing gaskets. If the pressure
drop does not come to a standstill, check the measuring circuit for
tightness. Due to the low volume of each compression stroke of the
test pump, only small volume test specimens should be tested.
• A pressure reduction is achieved by turning the fine adjustment valve (2) counter-
clockwise first and the by carefully opening the relief valve (3).
Remove the reference instrument or the test specimen only when the
relief valve (3) is open and no pressure is in the test pump any more.
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