Micro Motion CDM100M, Configuration And Use Manual

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Tip
Density offset calibration is the preferred method for calculating a density offset, because the
procedure automatically corrects the data to reference temperature and reference pressure. If this
procedure is available on your device, use it and do not set
Density Offset manually.
Prerequisites
Ensure that your process is stable during the calibration procedure. Minimize variation in
density, temperature, flow rate, and fluid composition. Minimize aeration.
If concentration measurement is enabled on your meter, ensure that Active Matrix is set to
the matrix that you want to calibrate.
Following the procedures defined in ASTM 1298 or API 555, obtain a laboratory reference
value for the density of your process fluid at reference temperature and reference
pressure.
Procedure
1. Navigate to the Density Offset Calibration method:
Service Tools
>
Maintenance
>
Calibration
>
Density Offset Calibration
.
2. Enter the laboratory reference value.
3. Press OK and wait for a few seconds while the calibration process is performed.
4. Choose Results and check the values.
If the calibration succeeded, the screen displays the updated value for
Density Offset
,
the reference temperature, and the updated concentration or referred density
value. This value should match the laboratory reference value.
If the calibration failed, Density Offset is reset to the original value.
• Verify your laboratory reference value.
• Ensure that your process was stable during the entire procedure.
• Repeat the calibration.
9.4 Adjust temperature measurement with
Temperature Offset
You can adjust the reported temperature measurement by modifying the value for
Temperature Offset . The temperature offset is always added to the measured temperature
value.
Meter-specific temperature calibration factors are determined at the factory. These values
are available on the meter tag.
Temperature Offset is applied after the temperature
calibration factors.
The default value for Temperature Offset is 0. Accordingly, the default value has no effect on
the reported temperature value.
Measurement support
Configuration and Use Manual 127