Catalytic Flammable Gas Sensors NP-ANS - NEMOTO - #1

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NEMOTOTECH S.r.l. – 20010 Cornaredo (MI) ITALY Via Legnano, 2 – Tel.+39.02.93544190 – Fax +39 .02. 93540347 C.F. e P. IVA (VAT) 03231490966 – CAPITAL . 36.000 EU – Website: www.nemototech.it – E-mail: info@nemototech.it TECHNICAL INFORMATION SHEET: NEMOTO NP-ANS Single Header Ammonia Pellistor Gas Sensor General Description The Nemoto NP-ANS is a catalytic (pellistor) type flammable gas sensor supplied as a matched pair of pellistor elements mounted on a single header and protected by a metal mesh enclosure and can. Designed as a single header, lower cost sensor, the NP-ANS is optimised for the detection of ammonia in air in range 0-100% LEL but is stable and sensitive enough to be used for ranges as low as 0- 5,000ppm, with alarm levels as low as 2,000ppm without false alarms, provided good quality circuitry is employed. A feature of the NP-ANS is its very high selectivity to ammonia, the sensitivity of the device to hydrocarbon gases being negligible. The highly automated manufacturing procedure employed by Nemoto results in a repeatable reliable sensor which, unlike similar devices, requires no trimming resistor to enable the detector to be matched with a compensator. Specifications: Recommended Voltage: 2.2V +/- 0.1V Current Drawn: 175 +/- 15mA Zero Offset: 0mV +/- 30mV Gas Sensitivity: 23 - 45mV/% NH3/Air Maximum Range: 0-50% LEL Minimum Range: 0-5000ppm Accuracy: +/- 200ppm(NH3) Maximum Long Term Drift: Span: < +/- 5% Signal/Month Zero: <+/- ½ mV/Month Response Time: T50: 3 sec T90: 8 sec Recommended Circuit: Note: The value R1 is arbitrary, since the function of R1 is to balance the bridge. 200
- 1K
is suggested. Temperature Range: -20°C to +60°C Temperature Drift: (-20°C to +70°C) Zero: < +/- 2%LEL Humidity: 0-100%RH, non-condensing Humidity Response: +/- 2%LEL Linearity: Effectively Linear to 50%LEL Test data on drift, poisoning, temperature performance, linearity is available on the Characterisation Document np-ans-CD.doc Nemoto has a policy of continuous development and improvement of its products. As such the specification for the device outlined in the data sheet may be changed without notice ds-npans.doc, issue 3, May 2008