NAB-Series - ABB Semiconductors

Specification sheet

The blind type differential pressure transmitter, mod. NAB, is

used to measure and convert a differential pressure value into

a proportional pneumatic signal.

The instrument works on the force-balance principle and

consists of two main units:

the measuring unit which detects the differential pressure

variation and consists of two forged bodies and a measuring

capsule.

The capsule is available in a single version of 5 in diameter

diaphragms, filled with a special liquid which can withstand the

maximum rated static pressure on either side without

damaging itself.

the transmission unit converts the differential force applied to

the measuring element into a proportional output pneumatic

signal.

The output pressure, generated by a flapper nozzle relay,

feeds the feedback bellows with a rising pressure until the

bellows force balances that of the measuring element.

Span value continuously adjustable by an internal micrometric

screw.

Zero value adjustable by an external screw.

Mounting in a vertical position on 2in diameter pipe by a

special bracket.

OPTIONAL EXTRA FEATURES

Special feedback bellows allow to reduce the standard

calibration span to a lower value (see table)

A zero elevation or suppression device allows to set as a

zero of the transmitter a measured variable value different from

zero.

The sum of the zero suppression value (S) plus the calibrated

span cannot exceed the upper range limit (M) suitable for the

diaphragm capsule : S + span ≤ M (see table).

GENERAL CHARACTERISTICS

Model NAB

Differential pressure

transmitter

Deltapi N Series

Pneumatic Transmitters

Air filter regulator can be directly mounted on the transmitter,

with or without pressure gauge, and connected with piping and

fittings either in stainless steel or copper.

Special versions of air filter regulator and gauges, in stainless

steel, are available on request.

Manifold. The transmitter can be supplied with a 3-valve

manifold block integrally mounted to simplify maintenance and

calibration procedures.

Oxygen measurements, special degreasing and final test

operations can be required on the oxygen measuring

transmitter

Cover material

thermoplastic resin

Diaphragm material

AISI 316L, Monel (*)

(*) Maximum overrange pressure reduced to 5 MPa (50 bar)

Gaskets material

PTFE, Viton

Capsule filling

Silicone oil, Perfluorinated polyethers (Galden) (*)

(*) When used for oxygen measurements the operating

temperature limits are -20°C and + 40°C.

Surface protections

- carbon steel body and flange: zinc plating and chrome

passivation,

- AISI 316L body and flange: no protection

Process connections (see figure ref. D and E)

- on flanges : 1/2 in NPT-F

- on adapters: 1/4 in NPT-F

- center distance: 54 mm.

Pneumatic connections

- Air supply (in figure ref. A): 1/4 in NPT-F

- Output (in figure ref. B): 1/4 in NPT-F

Pressure gauge

Brass with stainless steel case (all stainless steel on request)

external diameter 51 mm; 0-200 kPa, 0-2 bar and 0-30 psi

indication on 82 mm/260° scale.

Air filter regulator

with copper or stainless steel piping, as specified.

Die cast aluminium alloy with light grey epoxy finish.

Net weight (maximum)

16 kg approx

Packing

expanded polythene box

SPAN

LIMITS

min. and max.

MAXIMUM

ZERO

ELEVATION

STATIC PRESSURE

LIMITS

Full vacuum and

1.2 and 7.5 kPa

12 and 75 mbar

0.6 and 1.2 kPa

6 and 12 mbar

5 in

with special

feedback bellows

(•) Equal to Maximum Working pressure as well as overrange limit (on either side).

RANGE

LIMITS

lover and upper (M)

-7.5 and +7.5 kPa

-75 and +75 mbar

-7.5 and +7.5 kPa

-75 and +75 mbar

MAXIMUM

ZERO

SUPPRESSION (S)

6.3 kPa

63 mbar

6.9 kPa

69 mbar

MEASURING

CAPSULE

(DIAPHRAGM DIA.)

7.5 kPa

75 mbar

7.5 kPa

75 mbar

7,5 MPa (•)

75 bar (•)

SPECIFICATIONS

Air supply

nom. 140 kPa (1.4 bar, 20 psi); min. 125 kPa (1.25 bar,

18 psi); max. 175 kPa (1.75 bar, 25 psi)

Output signal

20 to 100 kPa/0.2 to 1 bar, 3 to 15 psi or 0.2 to 1 kg/cm2

Static air consumption

350 Nl/h

Maximum output flow

- with rising output pressure: 30 Nl/min.

- with falling output pressure: 40 Nl/min.

Accuracy

± 0.5% F.S.D. (typical)

Thermal drift (for ambient temperature variation between

-20° C and + 65° C)

- span 1.2 to 2 kPa (12 to 20 mbar): 0.6%/10°C

- span 2 to 7.5 kPa (20 to 75 mbar): 0.4%/10°C

Static pressure effect

for variation of 2.5 MPa (25 bar): ≤ ± 0.25%

Maximum displacement

2.5 cm3

Degree of protection in accordance with IEC 529

IP55

Ambient temperature limits

-40 and + 120°C

Bodies material

Carbon steel, AISI 316L

Body bolts and nuts material

High tensile carbon steel;

AISI 316 Class A4-80 per ISO3506;

AISI 316 Class A4-50 (*) per ISO3506, in compliance

with NACE MR0175;

high tensile stainless steel, in compliance with

NACE MR0175.

(*) Maximum static pressure reduced to 4 MPa (40 bar)

The data were obtained from laboratory tests on standard instruments with:

carbon steel or AISI 316L bodies; AISI 316L measuring element with silicone oil filling; gasket: PTFE;

calibration span : 4 kPa - 40 mbar.

Carbon steel

AISI 316L 01

fg BODY

ORDERING INFORMATION

Select one character or set of characters from each category and specify complete catalog number.

abc de fg hi j k lm

BASE MODEL

VERSION

BODY

MEASURING ELEMENT

GASKETS

OUTPUT

EXTRAS

PRODUCT CODE

abc BASE MODEL Code

Differential pressure transmitter

Span limits

kPa (inH2O) - (Note 1)

MEASURING ELEMENT Capsule

filling

Inert fill (*)

Silicone oil

AISI 316L (Note 2)

Monel (**)

AISI 316L (Note 2)

AISI 316L

Monel

AISI 316L

Core

material

Diaphragm

material

hi Capsule

diameter

5 in

1.2 and 7.5 (4.8 and 30)

0.6 and 1.2 (2.4 and 4.8)

1.2 and 7.5 (4.8 and 30)

0.6 and 1.2 (2.4 and 4.8)

1.2 and 7.5 (4.8 and 30)

0.6 and 1.2 (2.4 and 4.8)

Fulcrum

diaphragm gasket

Viton

PTFE (*)

Capsule gasketFlange gasket

(*) Suitable for oxygen service

Viton

PTFE (*)

Viton

PTFE (*)

GASKETS

Standard with body bolts and nuts in high tensile carbon steel

As 01 with integrally mounted manifold (to be quoted separately)

Standard with body bolts and nuts in AISI 316

As 11 with integrally mounted manifold (to be quoted separately)

Standard with body bolts and nuts in high tensile stainless steel

As 21 with integrally mounted manifold (to be quoted separately)

Standard with body bolts and nuts in AISI 316

As 51 with integrally mounted manifold (to be quoted separately)

de VERSION 01

Maximum operating pressure

reduced to 4 MPa (57 0 psi)

NAB

Note 1: Multiply by 10 the value in kPa (MPa) to obtain mbar (bar).

Note 2: Hastelloy C for some wetted parts.

(*) Suitable for oxygen service (operating temperature limits reduced: -20°C to + 40°C; -4°F to 104°F)

(**) Maximum overrange reduced to 5 MPa (725 psi)

OUTPUT 1

3 to 15 psi

3 to 15 psi with zero elevation device

3 to 15 psi with zero suppression device

0.2 to 1.0 kg/cm2

0.2 to 1.0 kg/cm2 with zero elevation device

0.2 to 1.0 kg/cm2 with zero suppression device

20 to 100 kPa / 0.2 to 1 bar

20 to 100 kPa / 0.2 to 1 bar with zero elevation device

20 to 100 kPa / 0.2 to 1 bar with zero suppression device

According to

ANSI/ISA S 51.1-1979

standard terminology

Piping

material Air filter

regulator Pressure

gauge

EXTRAS

- -

with

- -

with

Identification

tag material

lm Stainless Steel

Stainless Steel

- -

Stainless Steel

Copper

Stainless Steel

Copper

Compliance to NACE class II bolting, according to specification MR0175, latest revision

SS/NAB Rev 7

The Company's policy is one of continuous product

improvement and the right is reserved to modify the

specifications contained herein without notice.

MOUNTING DIMENSIONS

ABB Inc.

125 East County Line Road

Warminster, Pa 18974

USA

Tel. (215) 674-6000

Facsimile (215) 674-7183

ABB Ltd.

Howard Road

St. Neots, Cambs.

England PE19 8EU

Tel. (01480) 475321

Facsimile (01480) 217948

ABB Instrumentation spa

Via Statale, 113

22016 Lenno (CO)

Italia

Tel. 0344 58111

Facsimile 0344 56278