Measurement Specialties 9116 User Manual

Pressure Systems, Inc.                                                                                        Model 9116 User’s Manual 
 
 

 

Page 91 

 

www.PressureSystems.com 

 
Each internal DH200 transducer in a Model 9116 Intelligent Pressure Scanner contains non-
volatile read/write memory capable of storing the transducer's full thermal and pressure 
calibration data. 
 
The Model 9116 Intelligent Pressure Scanner module uses a third-order polynomial to convert 
transducer output voltage to pressure.  All calculations are carried out internally using high 
precision math.  The following formula is used for all pressure output calculations. 
 
 

P

T

(V)  

= 

[C

0

(T) + C

1

(T)*V + C

2

(T)*V

2

 + C

3

(T)*V

3

] * C 

SPAN

 - C

RZ

 

where: 
 

P

T

 

 

= 

Calculated applied pressure 

 V 

  = Transducer 

output 

voltage 

 

C

0

(T) .. C

3

(T)  =  Conversion coefficients generated from calibration data at 

temperature T. 

 

C

RZ

 

 

= 

Re-zero adjustment’s “offset”correction coefficient 

 

C

SPAN 

 

= 

Span adjustment’s “gain” correction coefficient 

 
Since the polynomial’s coefficients are a function of the current temperature, they are 
dynamically re-calculated by the module firmware (with other equations) to compensate for each 
transducer’s measured temperature change. 
 
Each Model 9116 Intelligent Pressure Scanner contains an integral purge/leak check calibration 
manifold. Through software commands, 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 9116’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.