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

or 0.075% as per model/sensor accuracy)

Maximum total performance and Total performance 

includes the measuring errors of

• non-linearity including hysteresis and nonreproducibility,

• thermal change of the ambient temperature as regards 

the zero signal and the calibrated span,

• effect of static pressure change on the calibrated span,

with transmitter re-zeroed at line pressure.

Specification – physical

(Refer to ordering information sheets for variant availability related to specific model or versions code)

Materials

Process isolating diaphragms (*)

AISI 316 L ss; AISI 316 L ss gold plated; Tantalum; 

Hastelloy®

 C-276; Hastelloy®

 C-276 on AISI 316L ss gasket 

seat.

Process flanges, adapters, plugs and drain/vent valves (*)

AISI 316 L ss (1); Hastelloy®

 C-276 (2); 

Kynar®

 (PVDF insert in AISI 316 ss flange).

AISI 316 L ss with flushing connections for high side of 

flange mounted version.

Sensor fill fluid

Silicone oil; Inert fill (Galden®

).

Mounting bracket (**)

Zinc plated carbon steel with chrome passivation; AISI 316 

ss; AISI 316 L ss.

Gaskets (*)

Viton®

; PTFE.

Sensor housing

AISI 316 L ss.

Bolts and nuts

AISI 316 ss bolts Class A4–80 and nuts Class A4–70 

per ISO 3506;

AISI 316 ss bolts and nuts Class A4–50 per ISO 3506, in 

compliance with NACE MR0175 Class II (std. static only).

Plated alloy steel bolts per ASTM-A-193-77a grade B7M and 

nuts per ASTM A194/A 194 M-90 grade 2HM, in compliance 

with NACE MR0175 Class II.

Electronic housing and covers

Aluminium alloy (copper content ≤ 0.3 %) with baked 

epoxy finish (colour RAL9002); AISI 316 L ss.

Covers O-ring

Buna N.

Local adjustments (zero, span and write protect)

For Standard HART version:

• Internal for zero and span (on connection board)

• External non-intrusive for zero, span and write protect 

in glass filled polyphenylene oxyde, removable (code 

R1).

For all other versions:

• External non-intrusive for zero, span and write protect 

in glass filled polyphenylene oxyde, removable.

Plates

Transmitter nameplate: AISI 316 ss screwed to the 

electronics housing.

Certification plate and optional tag/calibration plate: selfadhesive attached to the electronics housing or AISI 316 ss 

fastened to the electronics housing with rivets or screws.

Optional wired-on customer data plate: AISI 316 ss.

Laser printing on metal or thermal printing on selfadhesive.

For AISI 316 L ss housing it is mandatory to select option 

I2 or I3 for plates in AISI 316 ss.

Optional wired-on customer data plate can be populated 

with customized data (4 lines of 32 characters 4 mm/0.16 

in high).

Customized data have to be provided separately: in case 

of no data, the wired-on plate will be delivered blank.

Calibration

Standard: at maximum span, zero based range, ambient 

temperature and pressure;

Optional: at specified range and ambient conditions.

Device is delivered with a standard 4-point calibration 

record

(*) Wetted parts of the transmitter.

(**)U-bolt material: high-strength alloy steel or AISI 316 L ss;

bolts/nuts material: high-strength alloy steel or AISI 316 ss.

(1) Supplied as AISI 316 L or as ASTM A351 Grade CF-3M

(2) Supplied as Hastelloy C-276 or as ASTM A494 alloy 

CW-12MW

Optional extras

Mounting brackets (code Bx)

For vertical and horizontal 60mm. (2in) pipes or wall 

mounting. (EXCEPT U-BOLT ASSEMBLY WHICH IS NOT 

SUPPLIED FOR WALL MOUNTING, PARTS ARE THE SAME 

FOR PIPE AND WALL BRACKET OPTIONS, AS PER 

RELEVANT MATERIALS).

Display (code Lx)

L1/L5: 4 position (90° steps) user orientable

LS: fixed position

Optional plates (code Ix)

Code I1: AISI 316 ss wired-on plate with laser printed 

customized data (4 lines of 32 characters with 4 mm/0.16 

in. height).

Code I2: AISI 316 ss plate with laser printed tag (up to 32 

characters - long) and calibration details (up to 32 

characters: lower and upper range values and engineering 

unit) fixed onto transmitter housing.

Code I3: complete set of AISI 316 ss plates (see I1 and I2).

Surge protection (code S2)

Cleaning procedure for oxygen service (code P1)

Test Certificates (test, design, calibration, material 

traceability) (codes Cx and Hx)

Tag and manual language (codes Tx and Mx)

Manifold mounting (code A1)

Factory mounting and pressure test of ABB M26 

manifolds.

Process connections 

on flanges: 1/4 in. – 18 NPT on process axis 

on adapters: 1/2 in. – 14 NPT on process axis

centre distance (266DSH): 54 mm. (2.13 in.) on flange; 

51, 54 or 57 mm. (2.01, 2.13 or 2.24 in.) as per adapters 

fittings

fixing threads: 7/16 in. – 20 UNF at 41.3 mm centre 

distance

High pressure side of flange mounted version (*):

2 in. or 3 in., ASME Class 150 or Class 300 RF;

DN 50 or DN 80, PN 16 or PN 40 to EN 1092-1 Type B1

(*) Bolts and nuts, gasket and mating flange supplied by customer.

Electrical connections

Two 1/2 in. – 14 NPT or M20x1.5 threaded conduit entries, 

direct on housing. Only M20x1.5 for WirelessHART with 

one port used for antenna.

One certified stainless steel plug (supplied loose with 

thread according to housing entries) available as option.