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Pressure Systems, Inc. 98RK-1 & 9816 User’s Manual©
Page 22 www.PressureSystems.com
Figure 2.4
Optionally, the unit may be ordered with a true differential (reference per channel) manifold.
The RUN REF connection is used for situations where all channels have one reference
pressure. This input may also be left unattached to provide atmospheric reference pressure.
When using instruments with the reference per channel option (true differential), two (2)
pneumatic inputs will be provided for every numbered channel. These inputs are labeled “P” and
“R”. The “P” connection is the test pressure input. The “R” connection is the transducer
reference input pressure. Since each channel has its own reference pressure input, the RUN
REF input is not provided on the true differential tubing plate.
2.3.4.3 CAL Mode Inputs
The 9816 model (in the 98RK-1) contains pneumatic backplane inputs for CAL(CAL 1-8) and
CAL REF. When the module’s internal calibration valve is placed in the CAL/RE-ZERO position,
all DH200 transducer pressure inputs are pneumatically connected to the CAL input ports. All
DH200 reference inputs are pneumatically connected to the CAL REF input port. The CAL
input may be used to perform on-line zero adjustment of the transducers. The CAL input may
also be used for DH200 span adjustment calibrations and accuracy tests if appropriate pressure
calibrators (such as the 903x series) are available. Span calibration of multi-range scanners
may also utilize the CAL 1-8 ports if the highest applied pressure does not exceed the proof
pressure rating of any other installed transducer, otherwise the individual transducers must be
calibrated with the valve in the RUN position.
When the internal calibration valve is in the CAL/RE-ZERO position, the RUN inputs (RUN REF
and numbered input ports) are pneumatically dead-ended to prevent migration of contaminants
into the instrument.