Emerson VSG & VSSG Software Manual page 40

Instrument Calibration Pressures
Confirm the "mA Reading" value (the raw mA value at the analog module) is correct and stable.
If not already done, set the Minimum mA to 4.00
If not already done, set the Maximum mA to 20.00
Set the Minimum Pressure to the actual minimum pressure at 4mA as marked on the transducer.
Set the Maximum Pressure to the actual maximum pressure at 20mA as marked on the transducer.
Set the Offset to zero unless required otherwise. The offset value adds to the resultant linearly scaled value
and results in the Calibrated Value which is used for control
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