Method Description Setup
Digital
communications
A host writes pressure data to
the meter at appropriate
intervals.
a. Choose Menu > Configuration > Process Measurement >
Pressure Compensation > External Pressure.
b. Set External Pressure to On.
c. Perform the necessary host programming and
communications setup to write pressure data to the
transmitter at appropriate intervals.
Postrequisites
Choose Menu > Service Tools > Service Data > View Process Variables and verify the external pressure value.
Need help?
If the value is not correct:
• Ensure that the external device and the meter are using the same measurement unit.
• For polling:
— Verify the wiring between the meter and the external device.
— Verify the HART tag of the external device.
• For digital communications:
— Verify that the host has access to the required data.
— Verify that the host is writing to the correct register in memory, using the correct data type.
12.4.2 Set up pressure compensation using ProLink III
Procedure
1. Choose Device Tools > Configuration > Process Measurement > Pressure Compensation.
2. Set Pressure Compensation Status to Enabled.
3. Set Pressure Unit to the unit used by the external pressure device.
4. Enter the Density Factor and Flow Factor for your sensor.
a) Set Process Fluid to Liquid Volume or Gas Standard Volume, as appropriate.
b) Compare the values shown in Recommended Density Factor and Recommended Flow Factor
to the values from the product data sheet.
c) To use the recommended values, click Accept Recommended Values.
d) To use different factors, enter your values in the Density Factor and Flow Factor fields.
The density factor is the change in fluid density, in g/cm
3
/PSI. When entering the value, reverse
the sign.
Example
If the density factor is 0.000006 g/cm
3
/PSI, enter −0.000006 g/cm3/PSI.
Measurement support Configuration and Use Manual
April 2019 MMI-20048166
136 Micro Motion 4200 Transmitters
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