Configure The Pressure Input; Configure The Pressure Input Using Prolink Iii - Emerson Micro Motion SGM Series Configuration And Use Manual

Configure process measurement using ProLink III
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7.3

Configure the pressure input

Pressure data is required to calculate base density from line density. The meter does not
measure pressure, so you must provide an external pressure input. You must use absolute
pressure.
Pressure data is required for several different measurements. There are several different
methods to obtain pressure data.
Tip
A fixed value for temperature is not recommended. Using a fixed temperature value may produce
inaccurate process data.
Prerequisites
If you plan to poll an external device:
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7.3.1

Configure the pressure input using ProLink III

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2.
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- 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.
The primary mA output must be wired to support HART communications.
Ensure that the meter has the required polling slots available. The meter provides
four polling slots, and they may be already in use. You may need to use a fixed value
or digital communications for some external values. To check the current polling
configuration, choose Device Tools > Configuration > Polled Variables.
Choose Device Tools > Configuration > Process Measurement > Line Pressure.
Set Pressure Type to match the pressure measurement from the external pressure
device.
Option Description
Absolute
The external pressure device reports absolute pressure.
Gauge
The external pressure device reports gauge pressure.
Restriction
If Line Pressure Source is set to Fixed, you cannot configure Pressure Type. You must enter the
pressure value in the required form. To set Pressure Type, you may need to change the setting
of Line Pressure Source.
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Micro Motion Gas Specific Gravity Meters (SGM)