12.6 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) and D2 (high-
density) calibration points.
Important
Micro Motion flowmeters are calibrated at the factory, and normally do not need to be calibrated in the field.
Calibrate the flowmeter only if you must do so to meet regulatory requirements. Contact customer support
before calibrating the flowmeter.
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 the Field Communicator, choose
Configure
>
Manual Setup
>
Measurements
>
Optional Setup
>
LD Optimization
.
LD Optimization
is
used only with large sensors in hydrocarbon applications. If you are not using the Field Communicator,
contact Micro Motion before continuing.
•
The calibrations must be performed without interruption, in the order shown. Make sure 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.
12.6.1 Perform a D1 and D2 density calibration using the display
Procedure
1. Read the Prerequisites in
Perform a (standard) D1 and D2 density calibration
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.
e) Choose
Finished
.
Configuration and Use Manual
Measurement support
MMI-20048166
April 2019
Configuration and Use Manual
141