PACE Pressure Controller User Manual
[EN] English 6 - 5 K0443 Revision A
Venting
Either a zero or vent operation uses the vent port.
Vent
The system gas at the output pressure can be released from the vent port. Unrestricted gas
flow occurs in this operation.
Recommended
Use a controlled method to reduce the system pressure, at a controlled rate, to near
atmospheric pressure then select vent.
Zero
During a zero operation only the internal volume of the instrument vents to atmosphere.
Recommended
Do not obstruct the vent port. To diffuse gas exhaust, a diffuser may be fitted to the vent
port.
Output Port
The output port provides the controlled test pressure to the UUT.
Reference Port
The reference port provides the negative pressure to the gauge sensor and to the barometric
reference (option). Gauge sensors use this port identified as “REF”. For gauge sensors
(without a barometric reference) small pressures can be applied (Ref: MWP stated on the rear
panel of the control module). All other pressure measurement requires the port to be opened
to atmosphere.
When in gauge mode, the instrument shows and controls the pressure difference between
the reference port and the output port.
Note: This is not a true differential operation as there is no true differential calibration of the
sensor.
The transducer of the barometric reference option senses atmospheric pressure through the
reference port, when enabled the port must be open to atmosphere.
The reference connection should be used (differential connection option) for precision low
pressure measurement. The instrument controls pressure relative to the pressure at the
reference port. An atmospheric pressure change causes the controller to adjust the pressure
and appears at the pressure output as apparent instability. To keep a stable controlled
pressure, the reference port should be restricted. Using a reference port restrictor, short term
ambient pressure variations can be prevented from affecting controller performance.
The controller and UUT references should be connected together (using the optional
differential connection kit ) to provide a common reference to atmosphere.
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