Section 13 • Instruments Calibration

Analog Inputs

This section of the Calibration screen allows the opera- tor to define 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 define 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 defines the signal type and range transmitted by the instrument. The operator can choose from several predefined ranges in the drop- down box or enter a value.

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Emerson 20/20 service manual Analog Inputs
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20/20 specifications

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