Catalytic Flammable Gas Sensors NP-AC - 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-AC (Acetylene) Pellistor Gas Sensor General Description The Nemoto NP-AC is a catalytic (pellistor) type flammable gas sensor supplied as a matched pair of elements mounted on TO4 size headers and protected by a metal can. The sensor is specifically designed for the detection of Acetylene in air in the range 0-100% LEL. Until now, the use of pellistors to monitor Acetylene levels has presented technical problems due to Acetylene’s ability to poison catalytic gas sensors, resulting in short sensor lifetimes in the field. The NP-AC pellistor, however, cannot be poisoned by Acetylene, and will operate reliably in this application. The NP-AC should not be used for any other purpose without first consulting Nemototech. The device is compatible with a wide range of commercially available Gas Detection Systems and remote flammable gas detection heads. Specifications Recommended Voltage: 2.0V +/- 0.1V Current Drawn: 145-160mA Zero Offset: 0mV +/- 25mV Sensitivity: 8-14mV at 10% LEL Range: 0-100% LEL Acetylene Repeatability: Daily +/-3%LEL Monthly +/-5%LEL Maximum Long Term Drift: Span: < +/- 1% LEL/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 +50°C Temperature Drift: (-20°C to +70°C) Zero: < +/- 5%LEL Humidity: 0-95%RH, non-condensing Linearity: Effectively linear to 50%LEL C2H2 Nemototech 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-NPAC.doc, issue 2, May 2008