Emerson Micro Motion SGM Series Configuration And Use Manual page 117

Table 10-7: Options for HART variables
Process variable
Net Mass Flow Rate
Net Volume Flow Rate
Gas measurement
Base Density (Gas)
Specific Gravity (Gas)
Relative Density (Gas)
Molecular Weight (Gas)
Compressibility
%CO
2
%H
2
%N
2
%CO
Energy measurement
Calorific Value
Wobbe Index
Energy Flow
Interaction of HART variables and transmitter outputs
The HART variables are automatically reported through specific transmitter outputs. They
may also be reported through HART burst mode, if enabled on your transmitter.
Restriction
One some devices, the PV and the primary mA output are fixed to a specific process variable and
cannot be changed.
Table 10-8: HART variables and transmitter outputs
HART variable
Primary Variable (PV)
Secondary Variable (SV)
Tertiary Variable (TV)
Configuration and Use Manual
(continued)
Primary Varia-
ble (PV)
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
Reported via
Primary mA output
Secondary mA output, if
present on your transmitter
Not associated with an out-
put
Integrate the meter with the control system
Secondary Third Variable
Variable (SV) (TV)
✓ ✓
✓ ✓
✓ ✓
✓ ✓
✓ ✓
✓ ✓
✓
✓ ✓
✓ ✓
✓ ✓
✓ ✓
✓ ✓
✓ ✓
✓ ✓
Comments
If one assignment is changed, the other is changed auto-
matically, and vice versa.
If you have a secondary mA output: If one assignment is
changed, the other is changed automatically.
If you do not have a secondary mA output: The SV must be
configured directly, and the value of the SV is available on-
ly via digital communications.
The TV must be configured directly, and the value of the
TV is available only via digital communications.
Fourth Varia-
ble (QV )
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
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