Bidirectional Flow; Cylindric Lying Tank; Spherical Tank; Configuration With The Pc / Laptop Or Hht - ABB 266 HART Operating Instruction

Bidirectional Flow (to be used when the transmitter is connected to a bidirectional flow element)
Main characteristics
The bidirectional function, applied to the transmitter input (x) expressed in percentage of the calibrated span, has the following form:
Output = ½ + ½ sign (x) ∙ x ½
where "x" and "Output" should be normalized in the range 0 to 1 for calculation purpose, with the following Output meaning:
– Output = 0 means Analog out 4 mA;
– Output = 1 means Analog out 20 mA.
This function can be used for flow measurement purpose when the flow is in both the directions and the primary elements are
designed to perform this type of measure.
As an example, if we have a bidirectional flow measurement application with the following data:
Max reverse flow rate: -100 l/h
Max flow rate: +100 l/h
The differential pressure generated by the flow primary is for the maximum flow rate 2500 mmH2O, for the max reverse flow rate
2500 mmH2O.
The transmitter will have to be configured as follows:
Calibrated span: 4mA
20mA
Transfer function: Bidirectional flow
Once configured as above the transmitter will deliver:
flowrate 100 l/h reverse:
no flowrate:
Flow rate 100 l/h:

Cylindric lying tank

This function is used to measure the volumetric level into a cylindrical horizontal tank with flat ends. The transmitter calculates the
volume from the measured filling level.

Spherical Tank

This function is used to measure the volumetric level into a spherical tank. The transmitter calculates the volume from the measured
filling level.
Configuration with the PC/laptop or handheld terminal
A graphical user interface (DTM) is required for configuration of the transmitter via PC or laptop. For operating instructions, please
refer to the software description.
The 266 transmitters can be configured by either one of the following device.
- Hand Held terminals like the ABB 691HT, ABB DHH800-MFC, Emerson Process 375 and 475 provided the 266 EDD has been
downloaded and enabled in the terminal.
- ABB Asset Vision Basic, a new free of charge software configurator downloadable at www.abb.com/Instrumentation
- Any DTM based software for HART instruments configuration provided it is compatible with EDD or DTM.
= LRV = -2500mmH2O
= URV = +2500mmH2O
output= 4 mA
output= 12 mA
output= 20 mA
2600T Series Pressure transmitters | OI/266/HART-EN Rev. D 57