Revision 2.0 FOUNDATION Fieldbus ST 700 Pressure Transmitter User's Guide Page 45
Parameter Description
PRESSURE_UNITS Pressure Units.
DIFFERENTIAL_PRE
SSURE
Differential Pressure.
FLOW_TYPE Flow Type-Volumetric or Mass Flow.
FLOW_UNITS Flow Rate Units.
RATED_FLOW Flow rate at upper range value of Differential Pressure.
FLOW_RATE Present value of Flow rate.
Attributes
Supported Modes
The block supports the following modes:
• AUTO (Automatic)
• OOS (Out of Service).
In AUTO mode, the FTB constantly calculates the volumetric flow
rate based on the equation described and updates the values
based on change in ΔP of the flow units. In OOS mode, no
calculation is done; and the rated flow value can be changed.
The block goes out of service:
• When target mode is changed to OOS (or)
• RB is OOS (or)
• PRESS_BASIC is OOS (This is done because flow rate is
calculated from DP and is meaningless when PRESS_BASIC
is OOS).
Alarm Types
The block supports standard block alarms (see section 3.2).
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