ABB MEASUREMENT & ANALY TICS | DATA SHEET 266DSH Differential pressure transmitters

• Energy limited (Canada): Class I, Zone 2 Ex nC IIC T6...T4

• Intrinsically safe:Class I, II, III, Division 1, 

Groups A, B, C, D, E, F, G T6...T4

Class I, Zone 0 AEx ia IIC T6...T4 (US)

Class I, Zone 0 Ex ia IIC T6...T4 (Canada)

Type 4X, IP66, IP67 for all above markings.

COMBINED FM Approvals US and Canada 

• Intrinsically safe (code EA)

COMBINED ATEX, FM and IECEx Approvals (code EN)

Technical Regulations Customs Union EAC (Russia, 

Kazakhstan, Belarus), Inmetro (Brazil), Kosha (Korea)

(ONLY FOR WirelessHART VERSION)

With or without integral display

INTRINSIC SAFETY Ex ia:

• ATEX Europe (code E1) approval

II 1 G Ex ia IIC T4 and II 1/2 G Ex ia IIC T4, IP67.

• IECEx (code E8) approval

Ex ia IIC T4

FM Approvals US and FM Approvals Canada:

• Intrinsically safe:Class I, Division 1, Groups A, B, C, D; T4 

Class I, Zone 0 AEx ia IIC T4 Gb (US)

Class I, Zone 0 Ex ia IIC T4 Gb (Canada)

IP67 for all above markings.

IMPORTANT

REFER TO CERTIFICATES FOR AMBIENT TEMPERATURE 

RANGES RELATED TO THE DIFFERENT TEMPERATURE 

CLASSES.

Electrical Characteristics and Options

Optional indicators

Integrated digital display

(code LS; only with HART standard functionality)

Wide screen LCD, 128 x 64 pixel,

52.5 x 27.2 mm (2.06 x 1.07 in.) dot matrix.

Two keys for zero/span or without front

push buttons when ordered with R1 

external pushbuttons option 

Display may also indicate static pressure, 

sensor temperature and diagnostic messages. 

Integral display with integral keypad 

(code L1; not with HART standard functionality)

Wide screen LCD, 128 x 64 pixel,

52.5 x 27.2 mm (2.06 x 1.07 in.) dot matrix. 

Multilanguage. Four keys for configuration 

and management of device.

Easy setup for quick commissioning.

User selectable application-specific 

visualizations.

Totalized and instantaneous flow indication.

Display may also indicate static pressure, sensor 

temperature and diagnostic messages and provides 

configuration facilities.

Integral display with Through-The-Glass (TTG) activated 

keypad (code L5; not with HART standard functionality)

As above integral display but equipped 

with the innovative TTG keypad allowing 

the activation of the configuration and 

management menus of the device without 

the need of removing the transmitter 

housing cover. TTG keypad is protected 

against accidental activations.

Optional surge protection 

Up to 4kV 

• voltage 1.2 µs rise time / 50 µs delay time to half value

• current 8 µs rise time / 20 µs delay time to half value

Process diagnostics (PILD)

Plugged impulse line detection (PILD) generates a warning 

via communication (HART, PA, FF). The device can be 

configured to drive the output to “Alarm current” or set a 

status “BAD”.

HART®

 digital communication and 4 to 20 mA 

output – Standard and Advanced functionality

Device type: 1a06hex (listed with HCF)

Power supply

The transmitter operates from 10.5 to 42 V DC with no 

load and is protected against reverse polarity connection 

(additional load allows operations over 42 V DC). 

For Ex ia and other intrinsically safe approval power 

supply must not exceed 30 V DC. Minimum operating 

voltage increases to 12.3 V DC with optional surge 

protector or to 10.8 V DC with optional conformity to 

NAMUR NE 21 (2004).

Ripple

20 mV max on a 250 Ω load as per HART specifications.

Load limitations 

4 to 20 mA and HART total loop resistance :

A minimum of 250 Ω is required for HART communication. 

Output signal

Two–wire 4 to 20 mA, user-selectable for linear or square 

root output, power of 3

/2 or 5

/2 , square root for 

bidirectional flow, 22 points linearization table (i.e. for 

horizontal or spherical tank level measurement). HART®

communication provides digital process variable 

superimposed on 4 to 20 mA signal, with protocol based 

on Bell 202 FSK standard.

HART revision 7 is the default HART output.

HART revision 5 is selectable on request.

Output current limits (to NAMUR NE 43 standard) 

Overload condition

• Lower limit: 3.8 mA (configurable from 3.8 to 4 mA)

• Upper limit: 20.5 mA (configurable from 20 to 21 mA)

Alarm current 

• Lower limit: 3.6 mA (configurable from 3.6 to 4 mA)

• Upper limit: 21 mA (configurable from 20 to 23 mA, 

limited to 22 mA for HART Safety; apply for electronics 

release 7.1.15 or later)

Factory setting: high alarm current.

...Specification – electrical characteristics and options

IEC 62591 WirelessHART®

 output

Device type: 1a06hex (listed with HCF)

Network ID: ABBhex (2747 decimal)

Join keys: 57495245hex (1464422981) 4c455353hex (1279611731)

4649454chex (1179206988) 444b4559hex (1145783641).

Power Supply

1x D-cell size lithium-thionyl chloride battery.

Battery life: 10 years at 32 sec. update time, 8 years at 16 

sec. update time or 5 years at 8 sec. update time.

(at reference conditions of 25 ± 2 °C ambient temperature, 

data routed from 3 additional devices, LCD off). 

THE BATTERY CAN BE REPLACED IN FIELD, ALSO IN 

HAZARDOUS CLASSIFIED AREA.

Output signal

IEC 62591 WirelessHART Version 7.5 (IEEE 802.15.4-2006);