Pressure Systems 9022 Manual de usuario descargar pdf (Pagina 29)

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

2 - 9

2.3.6.2 CAL Mode Inputs

The 9016 model tubing plates contain inputs labeled CAL 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 port. 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

port 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.

2.3.6.3 PURGE Mode Inputs

All standard 9016 models contain a purge/leak check option. The purge option allows users to

apply positive pressure to the PURGE input which will then be vented out of the user input

ports, forcing contaminants (such as moisture) out of the pneumatic input lines. Note that on

common reference 9016 scanners, only the numbered input ports will be purged (RUN

REF is not purged). True differential 9016 scanners will purge both the run and reference input

ports for all channels. The purge supply provided to the 9016 must always be a higher

pressure than the highest pressure present on the input ports of the module. The purge

supply must also be capable of maintaining proper purge pressure at the high flow rates

encountered while the module is in the purge mode.

When commanded into the PURGE position, the purge input pressure will be connected to the

numbered measurement input ports allowing for a flow of air away from the instrument. The

purge cycle should be terminated by commanding the 9016 into a non-purge mode such as CAL.

Purge cycles should never be terminated by turning off the purge supply air while in the

purge position.

Warning: Failure to provide proper purge supply pressure will

result in migration of moisture and contaminants into the 9016

module which can result in permanent damage to module

components.

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Pressure Systems 9022 Manual de usuario Pagina 29