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Options for HART variables (continued)Table 6-7:
Process variable
Primary
Variable
(PV)
Secondary
Variable
(SV)
Third Varia-
ble (TV)
Fourth Var-
iable (QV )
Concentration measurement
Specific Gravity ✓ ✓ ✓ ✓
Concentration ✓ ✓ ✓ ✓
Referred Density (Concentration) ✓ ✓ ✓ ✓
Net Mass Flow ✓ ✓ ✓ ✓
Net Volume Flow ✓ ✓ ✓ ✓
(1) Quality Factor is the ratio of the energy stored in the vibrating tines to the energy lost during each vibration
cycle. In other words, it is a measure of the amount of energy required to vibrate the tines. Quality Factor is
inversely proportional to viscosity.
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.
HART variables and transmitter outputsTable 6-8:
HART variable Reported via Comments
Primary Variable (PV) Primary mA output If one assignment is changed, the other is changed auto-
matically, and vice versa.
Secondary Variable (SV) Secondary mA output, if
present on your transmitter
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.
Tertiary Variable (TV) Not associated with an out-
put
The TV must be configured directly, and the value of the
TV is available only via digital communications.
Quaternary Variable (QV) Not associated with an out-
put
The QV must be configured directly, and the value of the
QV is available only via digital communications.
6.5.3 Configure burst communications
Burst mode is a mode of communication during which the transmitter regularly broadcasts
HART digital information to the network via the primary mA output.
Integrate the meter with the control system
Configuration and Use Manual 111