Emerson VSG & VSSG Specifications download pdf (Page 75)

6 – 3

Section 6 • Instrument Calibration

Single Screw Compressor PLC Operation Manual • Vilter/Emerson • 35391CM

Figure 6-3. Pressure Calibration Screen - 3 of 3

CALIBRATE PRESSURE INSTRUMENT

To calibrate a pressure instrument, proceed with the fol-

lowing steps:

1. Select the units that the transducer is calibrated

in. For example, for a transducer calibrated 0-200

PSIA, the transducer units selected shall be ‘PSIA.’

For a transducer calibrated -30inHg to 30PSIG, the

transducer units selected shall be “inHg.”

2. Select the units that the pressure will be displayed

in on the HMI.

3. Enter the raw mA range (typically 4-20mA)

4. Enter the Span of the instrument. For a 0-200 PSIA

transducer, Enter “0” for XDCR Min and “200” for

XDCR Max.

CALIBRATE TRANSDUCER TO A KNOWN PRESSURE

There are two options when calibrating a transducer to

a known pressure.

NOTE

Differential pressures does not require calibration,

but the differential pressure display units can be

selected.

OPTION 1

1. Open the pressure transducer to a known pressure.

2. Adjust the Offset value until the “Displayed” value

is equal to the known pressure.

OPTION 2

1. Open the pressure transducer to a known pressure.

2. Enter the known pressure (in transducer units) into

“Target Value.” The controller will calculate an off-

set based on the known pressure that was entered.

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Emerson VSG & VSSG Specifications Page 75