BEAMEX CENTRICAL, User Manual

Page: 37 / 61

PO8C - Operation 31
O
PERATION
Turn the selector valve to VENT position.
Ensure that the regulated pressure is set to zero by turning the PRESSURE AD-
JUST knob
counterclockwise . Also turn the VACUUM ADJUST knob counter-
clockwise and set the ADJUSTABLE VOLUME to its midpoint.
Connect the output of PO8C module to the instrument under test and to a suitable
pressure measurement module.
Turn selector valve to either PRESSURE or VACUUM position depending on
your pressure needs. If you want to create pressures above atmospheric pres-
sure, open SUPPLY valve to ON position.
To regulate the pressure, use either PRESSURE ADJUST or VACUUM AD-
JUST
4
knobs (again, depending on your pressure needs). Observe the regulated
pressure/vacuum value from the pressure calibrator’s display. For exact pressure
adjustment, close the selector valve and use the ADJUSTABLE VOLUME knob.
Remember to make small changes and wait for the pressure to settle. Changes
in gas pressure affects the gas temperature and the tension/volume of the meas-
urement hoses.
To vent pressure, turn selector valve to VENT position. To avoid pressure shocks,
rotate the selector valve to VENT position via the regulator used for creating the
pressure.
When ready, ensure that the regulated pressure is set to zero by turning the
PRESSURE ADJUST knob
counterclockwise . Also turn the VACUUM ADJUST
knob counterclockwise , return the ADJUSTABLE VOLUME to its midpoint and
set the selector valve to CLOSE position..
Warning!
High pressure is always dangerous. Read carefully the
warnings in part Appendix of this manual.
4
Vacuum adjuster: Pull to adjust, push to lock.