Emerson Micro Motion Configuration And Use Manual

9.7 Adjust concentration measurement with Trim
Offset and Trim Slope
Trim Offset and Trim Slope 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
You must be able to take measurements of your process fluid at two different
concentrations.
You must be able to take a sample of your process fluid at each of these concentrations.
For each sample, you must be able to obtain a laboratory concentration value at line
density and line temperature.
Procedure
1. Collect data for Comparison 1.
a. Take a concentration reading from the meter and record line density and line
temperature.
b. Take a sample of the process fluid at the current concentration.
c. Obtain a laboratory value for concentration at line density and line temperature,
in the units used by the meter.
2. Collect data for Comparison 2.
a. Change the concentration of your process fluid.
b. Take a concentration reading from the meter and record line density and line
temperature.
c. Take a sample of the process fluid at the current concentration.
d. Obtain a laboratory value for concentration at line density and line temperature,
in the units used by the meter.
3. Populate the following equation with values from each comparison.
Concentration
Lab
=
(
A × Concentration
Meter
)
+ B
4. Solve for A (slope).
5. Solve for B (offset), using the calculated slope and one set of values.
6. Enter the results as the trim slope and the trim offset.
• Using the display: Not available
• Using ProLink III: Device Tools > Configuration > Process Measurement > Concentration
Measurement
Measurement support
Configuration and Use Manual 127

Emerson Micro Motion Specifications

General

Brand	Emerson
Model	Micro Motion
Category	Measuring Instruments
Language	English