266 HART Pressure Transmitters with DDS Digital Diaphragm Seal

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.

266 HART models available for a DDS configuration


266 Digital Diaphragm Seals (DDS) pressure transmitter is the perfect solution for reliable measurement of the filling quantity in containers, silos, tank systems where ambient temperature effects and fast response are critical to customer.

Key features: 
  • Ambient conditions do not influence anymore the accuracy of the system.
  • Faster response in case of process control actions.
  • Lower installation costs as well as lower cost of maintenance and replacement.
  • Modularity of the electronics and displays. 

Please contact us for detailed information on the devices and our DDS solution 

For the full portfolio of pressure transmitters and accessories click here



DDS: smartness beyond performances.

  • Base accuracy of the Primary / Secondary device: from ±0.06% up to ±0.04%
  • Span limits: 16 to 105000KPa; 64 inH20 to 15228psi
  • Availability of the reliable all-welded technology on S26 remote seal models
  • Full compliance with PED Category III


ABB's freedom of choice offers the right driver for the major fieldbus protocols suitable for ABB devices.

The Version Matrix document shows for each protocol the Software Revision that's compatible to the Hardware and Firmware Revision of the device.


Read first:

Version Matrix


Download software and relevant documents:


Software:                                                             DTM*, EDD

Supplementary Information:                        Driver Description


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