Specification sheet Deltapi N Series Pneumatic Transmitters Model NBD Absolute pressure transmitter GENERAL CHARACTERISTICS The blind type absolute pressure transmitter, mod. NBD, is used to measure an absolute pressure and convert it into a proportional pneumatic signal. The instrument works on the force-balance principle and consists of two main units: the measuring unit detects the absolute-pressure variation and consists of two forged bodies and a measuring capsule. A diaphragm capsule is placed within two halfbodies to releve the absolute pressure applied to the positive chamber. The capsule is available in a single version with 5in diameter diaphragms inside of which is obtained the vacuum. The structure of the diaphragm capsule can withstand the maximum overrange without damage. the transmission unit converts the force applied to the measuring element into a proportional output pneumatic signal. The output pressure, generated by a flapper nozzle relay, is fed to a 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 suppression device allows to set as a zero of the transmitter a measured variable value different from the absolute zero. The sum of the zero suppression value (S) plus the calibrated span cannot exceed the upper range limit (M) suitable 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. 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 DIAMETER SPAN LIMITS (absolute) min. and max. 5 in 1.2 and 7.5 kPa 12 and 75 mbar RANGE LIMITS (absolute) lower and upper (M) 0 and 7.5 kPa 0 and 75 mbar 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%/10C - span 2 to 7.5 kPa (20 to 75 mbar): 0.4%/10C 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 A4-50 per ISO3506, in compliance with NACE MR0175 MAXIMUM ZERO SUPPRESSION (S) 6.3 kPa 63 mbar OVERRANGE LIMIT 0.5 MPa 5 bar Cover material thermoplastic resin Diaphragm material AISI 316L Gaskets material PTFE, Viton 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) - on flange : 1/2 in NPT-F - on adapter : 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) 15 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 de BASE MODEL Absolute pressure transmitter NBD VERSION Standard with body bolts and nuts in high tensile carbon steel Standard with body bolts and nuts in AISI 316 fg 01 11 BODY 01 11 Carbon steel AISI 316L MEASURING ELEMENT Diaphragm hi material AISI 316L AISI 316L Core material AISI 316L (Note 2) AISI 316L (*) (Note 2) Capsule diameter 5 in 5 in Span limits kPa (mmHg) - (Note 1) 1.2 and 7.5 (9 and 56) 1.2 and 7.5 (9 and 56) 01 04 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) 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 suppression device 0.2 to 1.0 kg/cm2 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 suppression device EXTRAS Identification lm 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 3 4 6 7 9 02 10 11 13 14 SS/NBD 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