Calibrate The Sgm Device Using The Display - Emerson Micro Motion SGM Series Configuration And Use Manual

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5.4.1

Calibrate the SGM device using the display

SGM calibration is required to generate calibration coefficients for your process gas. These
coefficients are required for accurate measurement.
Prerequisites
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Procedure
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Configuration and Use Manual
Calibrate the SGM device using the Field Communicator
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.
Enter the Off-Line Maintenance menu and activate SCROLL until OFF-LINE CAL
appears on the display, then activate Select.
When CAL SG appears, activate Select.
Set the measurement type for this device.
a. When CAL TYPE appears, activate Select, then scroll through the list of options.
b. When the desired option appears, activate Select, then store the selection.
Option Description
Specific Gravity (SG) Gas density will be measured as specific gravity, and specific gravity
will be used for calibration.
Molecular Weight (MW) Gas density will be measured as molecular weight, and molecular
weight will be used for calibration.
Relative Density (RD)
Gas density will be measured as relative density, and relative density
will be used for calibration.
Set the calibration type (calibration format).
a. Activate SCROLL until CAL PTS appears.
b. Activate Select, then scroll through the list of options.
c. When the desired option appears, activate Select, then store the selection.
Purging and calibration
(Section 5.4.3)
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