ENGLISH
10/12
pressure indicators can be checked using an increasing pressure and
thereafter a declining pressure. This will give you the opportunity of
revealing any different readouts during increasing and declining
pressures. This is called hysteresis. To be able to achieve an exact
pressure, the pump has been provided with a volume adjuster which
enables fine adjustment of the pressure.
3.3
Pressure test process
3.3.1
Preparation of the test
Start connecting the hoses as described, including the pressure
indicator which has to be tested. Exhaust the system by turning the
release valve on the hand pump anti-clockwise and set the fine
adjustment threaded piston to mid range. Zero set the EPM if
necessary.
3.3.2 Increasing
pressure
Close the release valve and apply pump action to the hand pump piston
to generate the required approximate pressure. Stop a little before the
required pressure is reached and use the fine adjustment to reached
the desired pressure. Repeat this for each desired calibration point.
3.3.3 Declining
pressure
Open release valve with caution to let the pressure drop to a little above
desired pressure. Use the fine adjustment to reach desired pressure.
Repeat until all calibration points have been calibrated. Finally, the
system is vented using the release valve.
Warning
The hand pump may generate pressures higher than 7 Bar.
Therefore, please be careful not to expose the instrument
and the test object to over pressures.
For model EPM-2021, we recommend
ONLY
to use the fine
adjustment. Just a single stroke of the pump may bring the
pressure in excess of the measuring range (130 mbar) of the
EPM2021.
