20121018 100AD 100AD （C C C CA A A AT T T TA A A AL L L LY Y Y YT T T TI I I IC C C C T T T TY Y Y YP P P PE E E E G GG GA A A AS S S S S S S SE E E ENNNNS S S SO OO OR R R R） Handling manual Handling manual Nemoto Sensor Engineering Co., Ltd. 4-10-9, Takaido-higashi, Suginami-ku, Tokyo TEL. 03-3333-2760 FAX. 03-3333-7344 E-mail : sensor2nemoto.co.jp URL : http:/www.nemoto.co.jp NAP-100AD is a catalytic type gas sensor employed for mainly commercial or semi-industrial applications. Since this sensor has a simple explosion proof structure, it is applicable for commercial fields as it is, however intrinsic explosion proof enclosure is also recommended for industrial application. 1. Features and application of NAP-100AD 1) Features Good stability Excellent repeatability and detection accuracy Good linearity against gas concentration Quick response High temperature resistive 2) Applications Gas alarm or detector for general combustible gases Gas densitometer Driving module for gas leakage detector 2. Maximum ratings Supply voltage to sensor AC 3.3V (50 60Hz) DC 3.3V Ambient temperature and humidity in operation Temperature 40 +260 Humidity less than 99%RH (less than 100 degree C) (without dew condensation) Ambient temperature and humidity in storage Temperature 40 +80 Humidity less than 99%RH (without dew condensation) 3. Ratings Supply voltage to sensor AC 2.6 0.13V(5060Hz) DC 2.6 0.13V Current(when 2.5V is supplied) AC 160 180mA(5060Hz) DC 160 180mA Ambient temperature and humidity in operation Temperature 20 +200 (less than 100 degree C) Humidity less than 95%RH (without dew condensation) Ambient temperature and humidity in storage Temperature 30 +70 Humidity less than 99%RH (without dew condensation) 4. Detection range It can measure/detect whole combustible gases less than 100%LEL, but excellent accuracy of linearity within +/-10% can be obtained when the gas concentration is to be less than 50%LEL. If wider measurement range is necessary, NAP-100AC is recommended. 5. Response and recovery time From clean air to 10%LEL T90 : less than 10sec. From gas to clean air T90 : less than 20sec. (This time is dependent on ambient conditions.) 6. Specifications Detected gases General combustible gases Measuring range 1 - 100%LEL Gas sensitivity 65 - 85mV/% of methane Repeatability in the same day Less than 2% Methane sensitivity stability Less than 1%/month Zero offset stability Less than 1mV/month Resolution 100ppm of methane Zero offset value -35 - +35mV in clean air 7. Relative sensitivity Gases Chemical formulaLEL (%) Relative sensitivity 1 Methane CH4 5.0 100 2 Propane C3H8 2.2 75 3 Iso-Butane C4H10 1.8 75 4 n-Pentane C5H12 1.4 80 5 n-Hexane C6H14 1.2 75 6 n-Heptane C7H16 1.05 65 7 Iso-Octane C8H18 0.95 60 8 Methanol CH3OH 6.7 125 9 Ethanol C2H5OH 3.3 95 10 Iso-Propanol C3H7OH 2.2 80 11 Acetone (CH3)2CO 2.6 85 12 Toluene C6H5CH3 1.2 65 13 Ethyl acetate CH3COOC2H5 2.2 70 14 Hydrogen H2 4.0 110 15 Ammonia NH3 15.0 150 16 Cyclohexane C6H12 1.3 75 17 Ethylene C2H4 2.7 95 Note ) This sensor is not applicable for the detection of acetylene. The previous table can be used for quick reference as below. Example) In case 50%LEL ethanol is measured by detection equipment calibrated with 0 100%LEL of methane, the following conversion is made from the table. (95 x 50)/100=47.5%LEL by methane scale 8. Typical sensitivity characteristics 9. Structure and dimension No. Part name Material Remarks 1 Sensor 2 Compensator 3 Filament coil Platinum 0.03 mm Diameter 4 Separator SUS 304 t = 0.1 5 Mount base Phenol resin 6 Pins Pure Ni 0.8 mm diameter 7 Strainer SUS-304 t = 0.3 8 Sintered metal filter SUS-316 9 Fixer SUS-304 t = 0.5 10 Lead wire UL3266 FRPE 02040608010012014016018000.20.40.60.811.21.41.6Sensitivity value (mV)Gas concentration (%)Sensitivity value (mV)Gas concentration (%)MethaneIso-ButaneHydrogenEthanol10. Recommended circuit Note) Fixed resistors in the above circuit have to be metal film resistor, and variable resistor has to be cermet or metal film type. If the carbon type is employed, zero offset value is not stable because the resistance values of them are varied. 11. Evaluation method of sensor (1)Test equipment Outline of test equipment is shown as below. FanD.C. voltage stabilizerVoltmeterGas densitometerVentilatorGasRemarks) 1) Test chamber Material of test chamber is to be like as metal or glass which does not exhale and adsorb gases. Volume of test chamber is to be 1 litter per 1pc. of sensor. 2) Circumstance Clean air is to be available. Dirty