Specification sheet Deltapi N Series Pneumatic Transmitters Model NAB Differential pressure transmitter GENERAL CHARACTERISTICS 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). 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 SPECIFICATIONS 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. MEASURING CAPSULE (DIAPHRAGM DIA.) 5 in with special feedback bellows SPAN LIMITS min. and max. MAXIMUM RANGE ZERO LIMITS lover and upper (M) SUPPRESSION (S) MAXIMUM ZERO ELEVATION 1.2 and 7.5 kPa 12 and 75 mbar -7.5 and +7.5 kPa -75 and +75 mbar 6.3 kPa 63 mbar 7.5 kPa 75 mbar 0.6 and 1.2 kPa 6 and 12 mbar -7.5 and +7.5 kPa -75 and +75 mbar 6.9 kPa 69 mbar 7.5 kPa 75 mbar STATIC PRESSURE LIMITS Full vacuum and 7,5 MPa (*) 75 bar (*) (*) Equal to Maximum Working pressure as well as overrange limit (on either side). 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 Cover material thermoplastic resin Diaphragm material AISI 316L, Monel (*) (*) Maximum overrange pressure reduced to 5 MPa (50 bar) 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) Gaskets material PTFE, Viton Capsule filling Silicone oil, Perfluorinated polyethers (Galden) (*) (*) When used for oxygen measurements the operating temperature limits are -20C and + 40C. Thermal drift (for ambient temperature variation between -20 C and + 65 C) - span 1.2 to 2 kPa (12 to 20 mbar): 0.6%/10C - span 2 to 7.5 kPa (20 to 75 mbar): 0.4%/10C Surface protections - carbon steel body and flange: zinc plating and chrome passivation, - AISI 316L body and flange: no protection Static pressure effect for variation of 2.5 MPa (25 bar): 0.25% 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. Maximum displacement 2.5 cm3 Degree of protection in accordance with IEC 529 IP55 Ambient temperature limits -40 and + 120C 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) 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 ORDERING INFORMATION Select one character or set of characters from each category and specify complete catalog number. PRODUCT CODE abc de fg hi j k lm BASE MODEL VERSION BODY MEASURING ELEMENT GASKETS OUTPUT EXTRAS Code abc BASE MODEL NAB Differential pressure transmitter 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 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) fg Maximum operating pressure reduced to 4 MPa (57 0 psi) BODY 01 11 Carbon steel AISI 316L hi 01 07 11 17 21 27 51 57 MEASURING ELEMENT Core Diaphragm material material AISI 316L AISI 316L (Note 2) AISI 316L AISI 316L (Note 2) Monel Monel (**) Monel Monel (**) AISI 316L AISI 316L (Note 2) AISI 316L AISI 316L (Note 2) Capsule filling Inert fill (*) Inert fill (*) Silicone oil Silicone oil Silicone oil Silicone oil Capsule diameter Span limits kPa (inH2O) - (Note 1) 5 in 5 in 5 in 5 in 5 in 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) 04 06 21 23 41 43 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: -20C to + 40C; -4F to 104F) (**) Maximum overrange reduced to 5 MPa (725 psi) j GASKETS Flange gasket Viton PTFE (*) Fulcrum diaphragm gasket Viton PTFE (*) Capsule gasket Viton PTFE (*) 4 5 (*) Suitable for oxygen service k OUTPUT 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 lm EXTRAS Identification tag material Stainless Steel Stainless Steel Stainless Steel Stainless Steel Stainless Steel Piping material -Stainless Steel Copper Stainless Steel Copper According to ANSI/ISA S 51.1-1979 standard terminology Air filter regulator -with with with with Compliance to NACE class II bolting, according to specification MR0175, latest revision Pressure gauge ---with with 1 2 3 4 5 6 7 8 9 02 10 11 13 14 SS/NAB Rev 7 MOUNTING DIMENSIONS The Company's policy is one of continuous product improvement and the right is reserved to modify the specifications contained herein without notice. ABB Ltd. Howard Road St. Neots, Cambs. England PE19 8EU Tel. (01480) 475321 Facsimile (01480) 217948 ABB Inc. 125 East County Line Road Warminster, Pa 18974 USA Tel. (215) 674-6000 Facsimile (215) 674-7183 ABB Instrumentation spa Via Statale, 113 22016 Lenno (CO) Italia Tel. 0344 58111 Facsimile 0344 56278