Honeywell SC Series - 10.5.5 Calibration Data Entry

32 Honeywell Sensing and Control
Signal Conditioning, Self Calibrating Digital Indicators
Rev. G, 008-0608-00
10.5.5 CALIBRATION DATA Sub-Menu
This enters the values that will be used by the instrument when
it calibrates itself to the transducer. The menu items that are
displayed will change according to what the CALIBRATION TYPE
is set for.
EXCITATION Menu Item
This sets the excitation voltage used to power up the transducer.
The choice are:
• “EXCITATION=5VDC” means 5 volts dc excitation.
• “EXCITATION=10VDC” means 10 volts dc excitation.
NOTE: if the transducer includes a Signature Module, the excita-
tion voltage of the instrument is set to 5 Vdc regardless of the
value stored within the Signature Module.
FULL SCALE MV/V Menu Item
The transducer output when its full-scale load is applied to it, in
milliVolts-per-Volt. This menu item is used by the instrument to
set the gain of its amplifier circuit, and (when the CALIBRATION
TYPE is set to mV/V Calibration) to calibrate the instrument. This
value is normally found on the transducer’s Certificate of Calibra-
tion issued by its manufacturer.
This menu item may be automatically updated by a transducer’s
Signature Module. It is available for all calibration types.
FULL SCALE VALUE Menu Item
The transducer’s full-scale output in engineering units.
This menu item may be automatically updated by a transducer’s
Signature Module. It is available only with the Shunt Calibration
and mV/V Calibration types.
ZERO SCALE VALUE Menu Item
The transducer’s zero-scale output in engineering units, which is
usually zero.
This menu item may be automatically updated by a transducer’s
Signature Module. It is available only with the Shunt Calibration
and mV/V Calibration types.
SHUNT CAL VALUE Menu Item
The shunt calibration value must be calculated by using informa-
tion found on the transducer’s Certificate of Calibration and the
following formula:
SHUNT CAL VALUE =
Shunt-calibration output
Full-scale output
x Full-scale capacity
The terms have the following meanings:
• Shunt-CalibrationOutput:Thetransducer’soutputunder
shunt calibration conditions in mV/V. Sometimes called
“Shunt Cal. Factor”.
• Full-ScaleOutput:Thetransducer’sfull-scaleoutputinmV/V.
Sometimes called “Calibration Factor”.
• Full-ScaleCapacity:Thetransducer’sdesiredfull-scaleread-
ing in engineering units (PSI, lbs, Kg, etc.). You may wish to
convert the engineering units of this value. For example, if
the transducer full scale is 3000PSIG and you wish the chan-
nel to read in bar, you must convert 3000PSIG into 206.84
bar.
This menu item may be automatically updated by a transducer’s
Signature Module.
The shunt resistor’s ohmic value used to generate the Shunt-Cal-
ibration Output is given on the transducer’s Certificate of Calibra-
tion. Normally, the instrument has a shunt calibration resistor of
59000 (59K) ohms installed. If your transducer and instrument
were purchased at the same time from Honeywell, the correct
shunt resistor has been installed.
This menu item is only available with the Shunt Calibration type.
To verify proper transducer operation, you can apply the shunt re-
sistor to the transducer while the instrument is in the RUN mode.
Press and hold the [ENTER] button for three seconds; this will
apply the shunt resistor and display the reading.