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Differential pressure transmitter for interface level measurements

Model 266DLH is a specific application transmitter using a differential design for liquid level interface and density measurements, typically for two non mixable liquids (one upon the other) of different specific gravity in a tank.

Fieldbus & HART


The transmitter has a defined structure with two seals:
– one direct mount flanged flush diaphragm seal is on the high pressure side
– one remote seal, selectable wafer or flanged flush diaphragm, is fitted via capability to the low pressure side. It is very important to highlight that the seals should have the same physical characteristics (size, materials, etc.) for the two sides. 

With an MTBF that exceeds 200 years combined with the Taylor “All-welded” technology this transmitter can boost plant availability.
Replacing the communication board and terminal block in field is easy and safe: repairs can be done in minutes thus increasing transmitter and plant availability.

SIL2/SIL3 certification issued by TÜV Nord according to IEC 61508 represents another key-feature within 266 pressure transmitter portfolio. This certification is a real guarantee of protection and makes of 266DLH the smartest fit in Safety-critical loops.

266DLH features WirelessHART communication protocol allowing a shorter installation times by eliminating complex wired infrastructures, and lower overall implementation costs of process measurement.
266DLH battery life is about 10 years at 32 sec. update rates, delivering a very cost effective and reliable solution to monitor your process assets.


266DLH: smartness beyond performances.

- Base accuracy : ±0.1%
- Span limits: – 0.4 to 16kPa; 1.6 to 64inH2O
- Multiple protocol availability – provides integration with HART®, PROFIBUS PA, FOUNDATION Fieldbus and WirelessHART platforms offering interchangeability and transmitter upgrade capabilities
- Full compliance with PED Category III


Fieldbus & HART

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

Software: DTM*, GSD
Supplementary Information: Driver description

Software: EDD/CF
Supplementary Information: Driver description

ABB offers Software Tools that use the listed drivers in the table above for your device configuration and monitoring requirements.
Please read more & download

Fieldbus solutions
ABB offers a wide range of fieldbus products, accessories, tools, support documentations, applications and news.
Please read more
*) DSV401 Rx (SMART VISION) is not released with the latest DTM500 Bundle.
Please use any latest frame application (e.g. Stand-Alone-Tool ABB DAT200 Asset Vision Basic).


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