Specification sheet Deltapi N Series Pneumatic Transmitters Model NAD Differential pressure transmitter GENERAL CHARACTERISTICS 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. 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) MEASURING CAPSULE (DIAPHRAGM DIA.) 2 in 3 in SPAN LIMITS min. and max. RANGE LIMITS lower and upper(M) 30 and 170 kPa -170 and +170 kPa 300 and 1700 mbar -1700 and +1700 mbar 7 and 52 kPa 70 and 520 mbar -52 and +52 kPa -520 and +520 mbar MAXIMUM ZERO SUPPRESSION (S) MAXIMUM ZERO ELEVATION 140 kPa 1400 mbar 170 kPa 1700 mbar 45 kPa 450 mbar 52 kPa 520 mbar STATIC PRESSURE LIMITS Full vacuum and 41 MPa (*) 410 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 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) 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 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%/10C - span 80 to 170 kPa (800 to 1700 mbar): 0.2%/10C * with 3 in diaphragm - span 7 to 10 kPa (70 to 100 mbar): 0.6%/10C - span 10 to 52 kPa (100 to 520 mbar): 0.2%/10C 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. Static pressure effect for variation of 40 MPa (400 bar): 1% 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. 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 + 120C Bodies material Carbon steel, AISI 316L Body bolts and nuts material High tensile carbon steel; 17-4-PH in compliance with NACE MR0175 Pneumatic connections - Air supply (in figure ref. A): 1/4 in NPT-F - Output (in figure ref. B): 1/4 in NPT-F 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 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 NAD 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 17-4-PH As 21 with integrally mounted manifold (to be quoted separately) fg 01 07 21 27 BODY Carbon steel AISI 316L hi 01 11 MEASURING ELEMENT Diaphragm Core material material AISI 316L AISI 316L (Note 2) AISI 316L AISI 316L (Note 2) AISI 316L AISI 316L (Note 2) AISI 316L AISI 316L (Note 2) Capsule filling Silicone oil Silicone oil Inert fill Inert fill Capsule diameter 3 in 2 in 3 in 2 in Span limits kPa (inH2O) - (Note 1) 7 and 52 (28 and 208) 30 and 170 (120 and 682) 7 and 52 (28 and 208) 30 and 170 (120 and 682) 01 02 04 05 Note 1: Multiply by 10 the value in kPa (MPa) to obtain mbar (bar). Note 2: Hastelloy C for some wetted parts. GASKETS j k Flange gasket PTFE PTFE Capsule gasket Fulcrum diaphragm gasket PTFE PTFE Viton PTFE 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 2 5 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 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 SS/NAD Rev 7 MOUNTING DIMENSIONS