Adjust Concentration Measurement With Trim Slope And Trim Offset - Emerson Micro Motion SGM Series Configuration And Use Manual

Measurement support
Procedure
1.
2.
3.
4.
Example: Calculating the trim offset
Laboratory value
Meter value
Concentration offset: −0.72
Related information
13.6 Adjust concentration measurement with Trim
Slope and Trim Offset
Trim Slope and Trim Offset adjust the meter's concentration measurement to match a
reference value.
Tip
You can adjust concentration measurement by applying the trim offset only, or by applying both the
trim offset and the trim slope. For most applications, the trim offset is sufficient.
Prerequisites
•
138
Take a concentration reading from the meter, and record line density and line
temperature.
Subtract the meter value from a reference device.
Enter the result as the trim offset.
• Using ProLink III: Choose Device Tools > Configuration > Process Measurement >
Concentration Measurement, set Matrix Being Configured to your matrix, and
enter Trim Offset.
• Using the Field Communicator: Configure > Manual Setup > Measurements >
Conc Measure (CM) > Trim CM Process Variables > Concentration Offset
Take another concentration reading from the meter, and compare it to the
laboratory value.
• If the two values are acceptably close, the trim is complete.
• If the two values are not acceptably close, repeat this procedure.

Adjust concentration measurement with Trim Slope and Trim Offset

Ensure that the active matrix is the one that you want to trim. You can set the offset
and slope separately for each matrix on your transmitter.
64.21 %
64.93 %
64.21 − 64.93 = −0.72
®
Micro Motion Gas Specific Gravity Meters (SGM)