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Vacuum Degasser User manual
Page 12 MAN 0376
Operating the Degasser
Operating Summary
The notes below give a brief overview of the operating process. More information
is given in the following sections.
„
Select and fill each titrant container with the titrant(s) used for the analysis.
„
Verify that the Vacuum Degasser is properly installed as described in the previ-
ous
Setup and connection of the Degasser chapter.
Caution!
Never connect the Vacuum Degasser to the output side of the MPT-2
Autotitrator pump. The high pressure may cause permanent damage to the
degassing membrane.
„
Verify that plugs are installed in any unused ports.
„
Switch on the degasser and prime the MPT-2 as described in the MPT-2
Autotitrator manual. Allow the system to equilibrate for 5-10 minutes.
„
Shutdown the instrument when not performing any degassing.
General Operation
Powering up the Vacuum Degasser
With the Vacuum Degasser plumbed into the system and the power lead installed,
as described in the (see previous section), turn on the rear panel power switch. The
green Power LED should illuminate.
Immediately upon turning on the instrument, the microprocessor examines the
vacuum sensor signal to confirm that it is within an expected range. Following the
start-up test, the microprocessor ramps the vacuum pump to high RPM, to quickly
exhaust atmosphere from the vacuum chamber. As the vacuum level approaches
the preset control value, the pump RPM will slowly ramp down to a low speed
(typically 40 to 60 RPM) and will vary slightly as needed under the changing degas-
sing load to maintain a virtually constant vacuum level.
Initial pump-down
During initial pump-down, the yellow Status LED will be lit. Once the vacuum has
reached normal operating level, the yellow LED will extinguish and the green Vac-
uum LED will illuminate. As well as checking the front panel LEDs, the running of
MAN0376-2.0 - Vacuum Degasser.book Page 12 Friday, January 12, 2007 2:49 PM