Pressure Systems 9022 - Manual (Page 112)

Pressure Systems, Inc. NetScanner™ System (9016, 9021, & 9022) User’s Manual
www.PressureSystems.com 4 - 2
NOTE: Periodic zero and span calibration should be the only calibration required
to maintain specified performance throughout the life of the scanner.
Each model 9016 Intelligent Pressure Scanner contains an integral purge/leak check calibration
manifold. (Models 9021 and 9022 have no valves.) Through software commands to each 9016, this
valve may be placed in one of four positions: RUN, CAL, PURGE, or LEAK-CHARGE. (See the
Set/Do Operating Options/Functions (‘w’) command (ii=0C & 12) in Chapter 3, and in particular
the Valve Position Chart at the end of command’s description.) When each module’s internal
calibration valve is placed in the CAL/RE-ZERO position (through software commands), 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 9016’s transducers. This capability virtually
eliminates sensor zero drift error and ensures the highest possible data accuracy. The CAL input
may also be used for DH200 span adjustment calibrations. Span calibration of multi-range scanners
may also utilize the CAL input ports if the highest applied pressure does not exceed the proof
pressure rating of any installed transducer. Zero and span adjustment functions may also be
performed on Models 9021 and 9022 channels, but any valving must be supplied externally.
For reference when operating the 9016 calibration manifold, Figures 4.1 through 4.4 show
simplified pneumatic diagrams of the calibration manifold in its various positions.