Pressure Systems 9022 - Manual (Page 117)

Pressure Systems, Inc. NetScanner™ System (9016, 9021, & 9022) User’s Manual
www.PressureSystems.com 4 - 7
4.3.1. Span Calibration Valve Control
Before executing a Span adjustment (Calculate and Set Gains (‘Z’) command), the Model 9016
modules should have their calibration manifold valve placed in the proper position. For single
pressure range units the CAL position should be used since the span calibration pressure can be
applied between the CAL and CAL REF ports. Since the module will not attempt to shift this
valve automatically, as it does for Re-zero adjustment, it should manually be placed in the desired
position with the Set Operating Options (‘w’) command (option indexes = 0C and 12).
When span calibrating Model 9016 modules with multiple ranges installed, the CAL port may be
used to apply pressure to all transducers only if the specified proof pressure is not exceeded on
any channel. Refer to Calculate and Set Gains (‘Z’) command to specify the channels to be
affected by the command in a multi-range unit. If the application of a specific span pressure
exceeds the proof pressure rating of any other transducer contained within the same scanner, the
calibration pressures must be applied to the RUN side pneumatic input ports. Since the calibration
command (‘Z’) has a channel selection bit map parameter allowing it to calibrate only the desired
pressure channels, the RUN port is a viable option for supplying the calibration pressures. This also
applies to Models 9021 and 9022, which assumes an upscale pressure is already applied to its
transducer being adjusted.