Emerson Vilter MicroVission, Руководство по эксплуатации и обслуживанию

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Section 8 • Instruments Calibration
MicroVission Controller • Operation and Service Manual • Emerson • 35391MV 1.0
Auxiliary Inputs
Page 4 of the Calibration screen allows the operator to
define the parameters of an installed auxiliary analog
instrument. These instruments are usually not part of a
typical compressor set-up but MicroVission 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 define what the in-
put from the auxiliary instrument means in terms of unit
and range. If a temperature measuring instrument is
connected, then the operator would select temperature
from the “Units” dropdown box then set the minimum
and maximum value for the scale.
Channel Calibration
The Channel Calibration section defines the type of sig-
nal sent by the Instrument.
• Offset: Once the two-point calibration is complet-
ed, it is common for a small error to exist. By enter-
ing 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 defines the signal type
and range transmitted by the Instrument. The op-
erator can select from several predefined ranges in
the drop-down list or enter a value.
Figure 8-11. Instrument Calibration Screen Page 4 – Auxiliary Inputs (Discharge 2 Pressure)