5.2
Pressure measurements
For adjustments, calibrations or an inspection of accuracy, it is vital that the test item and the
reference have the same pressure.
The pressure needed for the test points is built up and adjusted with the hand pump (
§ 5.1).
Wait for pressure stabilisation!
After changes in the pressure, it takes a few minutes for the pressure in the measure-
ment device to stabilise (
§ 3.1).
Wait approximately 3…5 min before you begin taking measurements.
The necessary procedures for measuring pressure are configured by the operator.
Carrying out the pressure measurements:
•
Carry out the necessary tests and measurements.
•
Document your results.
5.3
Releasing pressure
Once the pressure measurements have been completed, the positive pressure in the hand
pump, the test item and in the pressure hose need to be brought into balance.
CAUTION! Risk of injury through excessive pressure!
Do not remove any connected components (test item, pressure hose, reference gauge) if
the hand pump is under pressure.
Open the pressure relief valve before removing any of the components.
Hold the hand pump so that no liquid is present at the cap of the
reservoir.
Otherwise liquid may be forced out through the safety valve in the
cap.
Releasing pressure: Turn the pressure relief valve knob
2-3 ro-
tations in an anti-clockwise direction and wait until there is no
longer any positive pressure.
Remove the test item with adapters and seals from the pressure
hose.
Put the hand pump away along with any accessories which have
been used.
(
§ 7: 'Maintenance / cleaning, storage and transportation')
IMPORTANT! Do not release the pressure without supervision!
When relieving the pressure, hydraulic liquid flows from the measurement device into
the reservoir. Pressure equalisation in the reservoir occurs through the safety valve in
the seal.
In the event of large-volume measurement devices or if hydraulic liquid has been refilled
during pressure generation, liquid can leak through the safety valve.
Carefully drain the pressure and note the fill level in the reservoir.
