NAD-Series - ABB Semiconductors

Specification sheet

GENERAL CHARACTERISTICS

Deltapi N Series

Pneumatic Transmitters

Model NAD

Differential pressure

transmitter

The blind type differential pressure transmitter, mod. NAD, 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 two versions: 2in or 3in diameter

diaphragms, filled with a special liquid, which can withstand the

maximum overrange pressure on one 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

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).

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.

Cover material

thermoplastic resin

Diaphragm material

AISI 316L

Gaskets material

PTFE, Viton

Capsule filling

Silicone oil, Perfluorinated polyethers (Galden)

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)

18 kg approx

Packing

expanded polythene box

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)

•with 2 in diaphragm

- span 30 to 80 kPa (300 to 800 mbar): 0.4%/10°C

- span 80 to 170 kPa (800 to 1700 mbar): 0.2%/10°C

• with 3 in diaphragm

- span 7 to 10 kPa (70 to 100 mbar): 0.6%/10°C

- span 10 to 52 kPa (100 to 520 mbar): 0.2%/10°C

Static pressure effect

for variation of 40 MPa (400 bar): ≤ ± 1%

Maximum displacement

- with 2 in diaphragm: 1 cm3

- with 3 in diaphragm: 1.5 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;

17-4-PH in compliance with NACE MR0175

MEASURING

CAPSULE

(DIAPHRAGM DIA.)

SPAN

LIMITS

min. and max.

30 and 170 kPa

300 and 1700 mbar

7 and 52 kPa

70 and 520 mbar

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

41 MPa (•)

410 bar (•)

STATIC PRESSURE

LIMITS

Full vacuum and

-170 and +170 kPa

-1700 and +1700 mbar

-52 and +52 kPa

-520 and +520 mbar

RANGE

LIMITS

lower and upper(M)

MAXIMUM

ZERO

SUPPRESSION (S)

MAXIMUM

ZERO

ELEVATION

170 kPa

1700 mbar

52 kPa

520 mbar

140 kPa

1400 mbar

45 kPa

450 mbar

2 in

3 in

SPECIFICATIONS

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

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

calibration span : 18 kPa - 180 mbar (for 3in diaphragm), 70 kPa - 700 mbar (for 2in diaphragm)

3 in

2 in

3 in

2 in

AISI 316L (Note 2)

Silicone oil

Inert fill

MEASURING ELEMENT

Diaphragm

material

AISI 316L

Core

material Capsule

filling Capsule

diameter Span limits

kPa (inH2O) - (Note 1)

hi 7 and 52 (28 and 208)

30 and 170 (120 and 682)

7 and 52 (28 and 208)

30 and 170 (120 and 682)

Viton

PTFE

GASKETS Fulcrum diaphragm gasket

PTFE

Flange gasket Capsule gasket

PTFE

Carbon steel

AISI 316L

fg BODY

de VERSION

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 17-4-PH

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

ORDERING INFORMATION

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

NAD

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

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

Note 2: Hastelloy C for some wetted parts.

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/NAD 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