10
Ensure that there is always a reliable pressure indicator connected to the pump when the pump is
used.
8. Test how much pressure increase can be done using the fine control. If it is enough,
continue to step 10.
9. With handles fully squeezed in, select the high pressure position on the stroke
selector and operate handles to generate approximate pressure.
Smaller handle
strokes enable easier pressure generation at high pressures.
The rate of the
pressure increase depends on the volume of the measurement system. Carefully
follow the reading of the pressure indicator in order to avoid exceeding the
maximum pressure of the measurement system.
10. Adjust pressure to required value using the fine control. Immediately after pressure
generation, the pressure may fall slightly due to the stretching of the pressure
measurement hose. Thermodynamic effects may also cause pressure variation.
In that case, adjust the pressure back to required value using the fine control.
11. The principal tool for releasing pressure from the measurement system is PGHH’s fine
control. Use of PGHH’s vent valve is also possible, but requires caution in order to
avoid pressure shocks to the measurement system.
12.
To totally release pressure from the system, turn PGHH’s vent valve
counterclockwise. Return the stroke selector knob to prime position after first
squeezing handles fully in.
Never fully screw out the ent valve. The sealling ball, placed inside the pump, may wear off.
If there is a strong counterforce while operating the handles, but no pressure increase is indicated,
stop pumping and locate the fault. Always keep a reliable indicator connected to the measurement
system.
The measurement system must only contain the measurement liquid and no gas.
