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2. Enter the laboratory reference value.
3. Press OK and wait for a few seconds while the calibration process is performed.
9.6 Adjust temperature measurement with
Temperature Offset or Temperature Slope
You can adjust the line temperature measurement by modifying the value for Temperature
Offset or Temperature Slope. The measured temperature value is always multiplied by the
temperature slope. The temperature offset is always added to the result.
Meter-specific temperature calibration factors are determined at the factory. These values
are available on the meter tag. Temperature Offset and Temperature Slope are applied after the
temperature calibration factors.
The default value for Temperature Offset is 0. The default value for Temperature Slope is 1.0.
Accordingly, the default values have no effect on the reported temperature value.
Note
Temperature offset and temperature slope are applied only to temperature data from the on-board
temperature sensors (internal RTD). External temperature data is not adjusted.
Tip
Although you can set Temperature Offset or Temperature Slope manually, the temperature calibration
procedure will generate a pair of offset and slope values that are more accurate for the individual
meter. However, temperature calibration can be difficult. Consult Micro Motion before performing a
temperature calibration.
Prerequisites
You will need an external temperature measurement method that is highly accurate.
Ensure that your process is stable during the sampling procedure. Minimize variation in
density, temperature, flow rate, and fluid composition. Minimize aeration.
Procedure
1. Take a temperature reading from the meter.
2. Immediately after the previous step, take a sample from a location as close to the
meter as possible.
3. Using the external measurement method, measure the temperature of the sample.
4. Use the following equation to calculate an appropriate value for Temperature Offset or
Temperature Slope.
t
Line
= TemperatureSlope ×
(
ρ
Line
+ TemperatureOffset
)
Tip
In most cases, you will set only one parameter. Follow the guidelines established for your site.
Measurement support
Configuration and Use Manual 147