Emerson Micro Motion SGM Series Configuration And Use Manual page 52

Purging and calibration
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Option Description
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).
Option Description
2-Point Calibration (2 PT) Appropriate for gases with two main constituents. Requires two cal-
ibration gases.
3-Point Calibration (3 PT) Appropriate for gases with three main constituents. Requires three
calibration gases.
Select the number of the calibration that you want to perform.
The device can store up to four independent calibrations. All calibrations must have
the same calibration type (2-point or 3-point). Each calibration can use different
calibration gases.
Enter data for each calibration gas.
a. Choose Setup Calibration and choose the calibration gas you are describing.
b. Select the calibration gas from the list. If it is not listed, select Other.
c. Enter the specific gravity, molecular weight, or relative density of the calibration
gas.
Tip
Enter the calibration gases in order of density, from lowest to highest. This allows heavier
gases to replace lighter gases.
Set the low-density calibration point.
a. Connect Calibration Gas Low to the pipework.
b. Set the pressure regulator on the calibration gas to the appropriate sample
pressure for your installation.
c. Choose Start Calibration and choose the calibration gas you are using, then click
OK.
d. Open the calibration valve (Valve B) and the exit valve (Valve C).
e. As the gas flows, observe the Sensor Time Period and Stability values.
f. Wait a minimum of 15 minutes for the system to stabilize. When Calibration
Point is Good, click OK.
If measurement does not stabilize after 30 minutes, click Abort and troubleshoot
the problem.
g. Close the calibration valve (Valve B).
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Micro Motion Gas Specific Gravity Meters (SGM)