9
Figure 3. Selecting prime versus high pressure mode with switching knob.
Priming pressure
switching
knob
(selector)
High pressure
4. Adjust the fine control (1 in figure 1) to “the middle”. Make sure the stroke
selector /switching knob (7 in figure 1) is set to prime fully out. If not, squeeze
handles fully in and press the selector (see figure 3).
To expel the air from the pump:
close the vent valve, increase the pressure (for example up to 50 bar) and after
that, open the vent valve.
or optionally
connect the hose to PGHH but not the instrument to be calibrated. Pump until
drops of water/oil come out of the end of the hose. Then connect the instrument
and raise pressure as described in the previous paragraph.
5. Make sure no gas is left in the measurement system during the calibration procedure.
Keep for example a valve connected to the measurement system open while priming
the system until all gas is removed or temporarily connect a vacuum pump to remove
gas from the measurement system. Remember to remove the vacuum pump from the
system before increasing the pressure.
Vent external systems before connecting to the pump.
6. Close PGHH’s vent valve fully clockwise.
7. Prime the system by squeezing handles together and then releasing, allowing the
fluid to enter the pump cylinder. Repeat as necessary until system is fully primed and
low pressure is indicated on either a calibrator or the test instrument.
