Tip
You can also set Active Calibration from the Calibration Data window. This allows you to
change the calibration without going through the calibration wizard.
For 2-point calibrations, two calibration coefficients (K0 and K2) are calculated and used in
measurement.
For 3-point calibrations, three calibration coefficients (K0, K1, and K2) are calculated and
used in measurement.
Postrequisites
To restore normal gas flow, close the calibration valve (Valve B) and open the isolation
valve (Valve D) and the input valve (Valve A).
Related information
Functional view of the SGM
Troubleshooting SGM calibration
5.4.3 Calibrate the SGM device using the Field Communicator
SGM calibration is required to generate calibration coefficients for your process gas. These
coefficients are required for accurate measurement.
Prerequisites
• You must have completed the purge procedure, and the reference chamber must
be filled with the reference gas to the appropriate control pressure.
• You must know whether you want the device to operate as a specific gravity meter,
a molecular weight meter, or a relative density meter.
• You must know whether you want to perform a two-point calibration or a three-
point calibration.
• You must have identified all required calibration gases and know their specific
gravity, molecular weight, or relative density.
• You must be prepared to flow all calibration gases through the device, at the
appropriate sample pressure. In a typical application, the sample pressure should be
approximately 25% greater than the control pressure.
Procedure
1. Choose Configure > Manual Setup > Measurements > Optional Setup > Gas Meter
Calibration.
2. Set the measurement type for this device.
Option
Description
Specific Gravity (SG)
Gas density will be measured as specific gravity, and specific gravity
will be used for calibration.
Purging and calibration
Configuration and Use Manual 43
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