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The ABB HART 266 Digital Diaphragm Seal (DDS) pressure transmitters have been designed to address issues that conventional remote seal system already address, plus many of the problems that traditionally require high costs or performance compromises.
This is especially valid when devices are to be installed on tall vessels or distillation towers. DDS are based on the reliable ABB sensing technologies and deliver a differential pressure (DP) measure through a digital approach to its calculation.
DDS is indeed a system, designed as the combination of two direct mount gauge sensors connected with a nonproprietary electrical wire.
The sensor to be installed on the high side of the DP measure, is defined as “Primary device” and embeds all the functions necessary to calculate the DP. It’s the “brain” of the system which transmits signals back to the DCS/control room leveraging a standard two-wires 4–20 mA HART signal.
The other sensor, defined as “Secondary” has the function to collect independently the pressure on the low side and transmits it to the Primary for elaboration. Such digital architecture has multiple advantages if compared against a traditional oil-based capillary system.
The 266 multivariable transmitter can be delivered from factory fully configured according the customer specific application parameters.
Mass flow measurement:
Mass flow of gas, steam, liquid and standard volume flow of gas are calculated in accordance with AGA3, ISO 5167 and standardised correction calculations GERg88, AGA*.
High pressure Direct Mass measurement:
Used for DP flow measurement it calculates the mass flow of gas, steam and liquid with dynamic compensation. The measurement accuracy improves by 1% to 2%. Due to the available draft range, this transmitter is tailored for use with the cheap and easy to install averaging Pitot tubes.
Level measurement:
In level applications the multivariable transmitter calculates the fluid density depending on temperature and pressure for dramatically increase of measurement accuracy even when using diaphragm seals.
Improves the hydrostatic level measurement with or without diaphragm seals due to density correction for level measurement in open tanks, closed tanks, boiler drum measurement.
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