Pressure Systems 9022 Manuel d'utilisateur télécharger pdf (Page 114)

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Measurement Specialties Inc. NetScanner System (9016, 9021, & 9022) User’s Manual

4 - 2

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.

NOTE: Periodic zero and span calibration should be the only calibration

required to maintain specified performance throughout the life of the scanner.

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Pressure Systems 9022 Manuel d'utilisateur Page 114