
Reference Manual
00809-0100-4716, Rev JA
May 2008
4-13
Rosemount 3095 MultiVariable
FIELDBUS
Mass Flow Transducer Block (1200)
Contains configuration and diagnostic information to perform fully
compensated mass flow calculations. Contains the mass flow process
variable (PV). Mass flow is calculated using process differential pressure and
pressure. Temperature can be based on either process temperature or a fixed
temperature value.
LCD Transducer Block (1300)
The LCD Transducer Block is used to configure the LCD display.
Analog Input Block (1400 to 1800)
Takes the analog input data from the analog input signal and it makes
available to other function blocks. It has scaling conversion, filtering, square
root, low cut and alarm processing.
Analog Output Block (1900)
The AO block provides an analog value to generate an analog output signal. It
provides value and rate limiting, scaling conversion, fault state mechanism
and other features.
Input Selector Block (2200)
Has four analog inputs that may be selected by an input parameter or
according to a criterion as first good, maximum, middle and average.
Integrator Block (2100)
Integrates a variable in function of the time. There is a second flow input that
may be used for the following applications: net flow totalization, volume/mass
variation in vessels and precise flow ratio control.
Arithmetic Block (2300)
This calculation block provides some pre-defined equations ready for use in
applications as flow compensation, HTG, ratio control and others.
Signal Characterizer Block (2400)
Has capability for two signal characterization based on the same curve. The
second input has an option for swapping “x” to “y”, providing an easy way to
use the inverse function, which may be used in signal characterization of
read-back variables.
PID Block (2000)
Allows the selection of either the standard ISA algorithm or a series algorithm.
Additionally the Proportional, Integral and Derivative actions can be based
either on the PV or on the error. An additional enhancement provides beta
and gamma factors for proportional and derivative multipliers providing a “two
degrees of freedom” system.
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