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Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
Analog Inputs
This section of the Calibration screen allows the opera-
tor to defi ne the parameters of an installed auxiliary ana-
log instrument. These instruments are usually not part
of a typical compressor setup but Vission 20/20 provides
a way for the operator to add additional capabilities. The
layout of this screen is typical to the pressure and tem-
perature calibration screens.
Device Calibration:
• These setpoints allow the operator to defi ne what the
input from the auxiliary instrument means in terms
of units and range. If a temperature measuring in-
strument is connected, then the operator would se-
lect temperature from the Unit drop-down box then
set the maximum and minimum value for the scale.
Offset:
• Once the two-point calibration is completed, it is not
uncommon for there to be a small error. By entering
the value of the error from the calibrated value and
the actual value into the adjustment entry box, that
error will be added/subtracted from the total offset.
The offset is applied to the calibrated value which
should correct the error.
Range:
• Here the operator defi nes the signal type and range
transmitted by the instrument. The operator can
choose from several predefi ned ranges in the drop-
down box or enter a value.
Section 13 • Instruments Calibration