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.
Line
= TemperatureSlope ×
Line
+ TemperatureOffset
Tip
In most cases, you will set only one parameter. Follow the guidelines established for your site.
5. If you are using the offset to adjust temperature measurement, set Temperature
Offset to the calculated value.
• Using ProLink III: Device Tools > Configuration > Process Measurement > Line
Temperature > Temperature Offset
• Using the Field Communicator: Not available
The default value is 0. The range is unlimited.
6. If you are using the slope to adjust temperature measurement, set Temperature
Slope to the calculated value.
• Using ProLink III: Device Tools > Configuration > Process Measurement > Line
Temperature > Temperature Slope
• Using the Field Communicator: Not available
The default value is 1.0. The recommended range is 0.8 to 1.2. If your calculated
slope is outside this range, contact Micro Motion customer service.
Measurement support
132 Micro Motion
®
Gas Specific Gravity Meters (SGM)
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