Measurement Specialties 9116 User Manual

Pressure Systems, Inc.                                                                                        Model 9116 User’s Manual 
 
 

 

Page 15 

 

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  CAL Mode Inputs 

 
The Model 9116 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 Model 9116s 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 Model 9116 scanners, only the numbered input ports will be purged 
(RUN REF is not purged).  True differential Model 9116 scanners will purge both the run and 
reference input ports for all channels.  The purge supply provided to the Model 9116 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 Model 9116 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.