Pressure Systems 9816, 98RK user manual CAL Mode Inputs

Pressure Systems, Inc. 98RK-1 & 9816 User’s Manual©

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.

2.3.4.3CAL 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-ZEROposition, 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 1-8ports 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-ZEROposition, the RUN inputs (RUN REF and numbered input ports) are pneumatically dead-ended to prevent migration of contaminants into the instrument.

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