Emerson Micro Motion SGM - Page 34

• 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 if you want a two-point calibration or a three-point calibration. Most applications require a
two-point calibration. In purity applications, a three-point calibration may be more appropriate. For more
information, see 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 20% greater than the reference
chamber pressure.
Related information
Calibrate the SGM device using the display
Calibrate the SGM device using ProLink III
Calibrate the SGM device using a field communicator
5.4.1 Calibrate the SGM device using the display
Procedure
1. Read the Prerequisites in Calibrate the SGM device if you have not already done so.
2. Enter the Off-Line Maintenance menu and activate SCROLL until OFF-LINE CAL appears on the display,
then activate Select.
3. When CAL SG appears, activate Select.
4. 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 Meter Gas density will be measured as specific gravity, and specific gravity will be
used for calibration.
Molecular Weight Meter Gas density will be measured as molecular weight, and molecular weight
will be used for calibration.
Relative Density Meter Gas density will be measured as relative density, and relative density will be
used for calibration.
5. 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 Configuration and Use Manual
March 2021 MMI-20020954
34 Micro Motion Gas Specific Gravity Meters (SGM)