Table of Contents
Advertisement
266CRH / 266CRT, 266CSH / 266CST MULTIVARIABLE PRESSURE TRANSMITTER | OI/266CXX/MODBUS-EN REV. A
Damping and transmission function
Damping
If the output signal of the pressure transmitter is conditionally
irregular due to the process it can be electrically smoothed
(damped).
The additional time constant can be set in increments of
0.0001 seconds to a value between 0 and 60 seconds.
The damping has no influence whatsoever on the digitally
displayed measured value in the physical unit. It only acts on the
values that are derived from this, such as the analog output
current, the free process variable, the input signal for the
controller, etc.
The damping can be set locally via the LCD display or the Device
Type Manager (DTM).
Transmission function
In the evaluation of the output signal of the multivariable
transmitters, you must bear in mind that these devices can work
with different transmission functions.
For the 266Cxx without calculation function can be set:
•
Linear for measurements of differential pressure or fill
level
•
Square root (x) for flow measurements in accordance
with the differential pressure procedure with throttle
elements such as orifices, nozzles, Venturi / swirl tubes
and similar items
•
Square root (x3) for flow measurements in open chutes
with rectangular or trapezoidal measurement weir
•
Square root (x5) for flow measurements in open chutes
with V-measurement weir (triangular weir)
•
Bidirectional for flow measurements with bidirectional
characteristic curve
•
With customer-specific linearization table.
•
For cylindrical, horizontal tanks
•
For spherical tanks
For 266Cxx multivariable transmitters, set for mass flow
measurement, the following functions are possible:
•
Square root (x) for differential pressure flow measuring
with throttle elements
•
Bidirectional for flow measurements with bidirectional
characteristic curve
In addition, all characteristic curves are influenced by the
pressure-dependent and temperature-dependent status
correction.
For 266Cxx multivariable transmitters set for level measurement,
the following functions are possible:
•
Linear
•
With customer-specific linearization table
•
For cylindrical, horizontal tanks
•
For spherical tanks
Moreover, all characteristic curves are influenced by the
temperature-dependent, for drum water level measurement,
also pressure-dependent, density correction.
The output transmission functions can be activated via the LCD
display or the Device Type Manager (DTM).
63
Advertisement
Table of Contents
