13.6 Perform a (standard) D1 and D2 density calibration
Density calibration establishes the relationship between the density of the calibration fluids and the signal
produced at the sensor. Density calibration includes the calibration of the D1 (low density, usually air) and D2
(high density, usually water) calibration points.
Important
Micro Motion flow meters are calibrated at the factory, and normally do not need to be calibrated in the field.
Calibrate the flow meter only if you must do so to meet regulatory requirements. Contact customer support
before calibrating the flow meter.
Tip
Use meter validation and meter factors, rather than calibration, to prove the meter against a regulatory
standard or to correct measurement error.
Prerequisites
• During density calibration, the sensor must be completely filled with the calibration fluid, and flow through
the sensor must be at the lowest rate allowed by your application. This is usually accomplished by closing
the shutoff valve downstream from the sensor, then filling the sensor with the appropriate fluid.
• D1 and D2 density calibration require a D1 (low-density) fluid and a D2 (high-density) fluid. You may use air
and water.
• If LD Optimization is enabled on your meter, disable it. To do this using a field communicator,
choose Device Tools → Configuration → Informational Parameters → Sensor → LD Optimization and select
Disable. LD Optimization is used only with large sensors in hydrocarbon applications. If you are not using a
field communicator, contact Emerson before continuing.
• The calibrations must be performed without interruption, in the order shown. Ensure that you are
prepared to complete the process without interruption.
• Before performing the calibration, record your current calibration parameters. You can do this by saving
the current configuration to a file on the PC. If the calibration fails, restore the known values.
13.6.1 Perform a D1 and D2 density calibration using the display
Procedure
1. Read the Prerequisites in Perform a (standard) D1 and D2 density calibration if you have not already
done so.
2. Close the shutoff valve downstream from the sensor.
3. Fill the sensor with the D1 fluid and allow the sensor to achieve thermal equilibrium.
4. Choose Menu → Service Tools → Verification and Calibration → Density Calibration.
5. Perform the D1 calibration.
a) Choose D1 (Air).
b) Enter the density of your D1 fluid.
c) Choose Start Calibration.
d) Wait for the calibration to complete. This should take approximately 10 seconds.
e) Choose Finished.
6. Fill the sensor with the D2 fluid and allow the sensor to achieve thermal equilibrium.
Measurement support Configuration and Use Manual
May2024 MS-00809-0200-1600
154 Emerson.com
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