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MUCsie monitor corporation IR Gas Sensor Module <br /> Model5100-28 <br /> Product Data Sheet <br /> The IR Gas Sensor Module monitors for <br /> Methane, Propane, Ethane, or Butane j <br /> using Infrared technology. The monitor <br /> interfaces to the Sentry hazardous gas risk <br /> management system or uses a 4-20 mA <br /> output signal to interface to other <br /> controllers <br /> The IR Gas Sensor Module utilizes Non-Dispersive <br /> Infrared technology to monitor for combustible <br /> gases (Methane and others). Output range is either <br /> 0-100% of LEL (default) or percent (%) by volume. <br /> This Module requires minimal maintenance with a <br /> calibration check once a year. Internal continuous <br /> self-diagnostics will automatically indicate any fault <br /> or optics problems. The 5100-28 interfaces directly <br /> with the Sierra Monitor Sentry Controller via the <br /> Sentry digital bus or directly to other devices using <br /> RS-485 Modbus RTU serial output or a 4-20 mA <br /> analog output signal. With the Sentry system the <br /> user has the capability of Modbus serial <br /> communications, extensive diagnostic features, <br /> multiplexing sensor connections, and field-proven How It Works <br /> reliability. Most combustible gases absorb infrared light <br /> Infrared technology has the benefits of: energy at defined wavelengths, providing an <br /> absorption signature for that gas. The principle of <br /> • Reduced need for calibration and thus lower an infrared detector is based upon the absorption of <br /> operating costs. the infrared light at a specific wavelength as it <br /> • Operates in high combustible gas and/or low passes through the gas. The more of the absorbing <br /> oxygen environment gas that is present, the more light is absorbed. The <br /> • Can operate in environments where catalytic detector measures the energy from an infrared light <br /> bead poisons might exist beam at a wavelength that is absorbed by the gas <br /> and compares it to the energy emitted by the <br /> • Rapid recovery after exposure to high source. The difference in energy received by the <br /> concentrations of hydrocarbon gas detector indicates the level of gas in the <br /> (exceeding 100% LEL) atmosphere. <br /> Specifications: <br /> Sensor type: Infrared, Dual Wavelength Electrical Data: <br /> Performance Power consumption: 3 watts <br /> Dual Range: Connection type: 3 wire <br /> Default: 0-100%LEL Methane or Propane Input voltage: 24 VDC nominal: 10-30VDC <br /> User Setting: 0-100%by vol. Methane(%Vol not Operating Range: <br /> FM verified) Ambient Temp Range: -40 to 140°F(-200 to 600C) <br /> Repeatability: +/-1%LEL Relative Humidity: 5-99% <br /> Response time: <10 sec to 60%full scale <br /> Accuracy: +/-1%for 0-50%LEL range Construction: <br /> +/- <br /> 2%for 51-100%LEL range Dimensions: 7.5 x 5.0 x 4.8 inches <br /> (HxWSensor Life: Typically>5 years eight: ) 2.7 l x 1.3 x 12.2 cm) <br /> Weight: 2.7 Ib.(1.3 Kg) <br /> Output: Housing: Explosion proof,Class 1, Div. I, Groups B,C, D <br /> Display: Fixed and Scrolling LED Performance: Explosion proof,Class 1, Div. 1, Groups C, D <br /> Relay: 0.25 Amp, High Alarm, Low Alarm, Warranty: 2 years <br /> Trouble, all SPDT Approvals: FM Approval <br /> Signal Output: Sentry digital bus <br /> Analog 4-20 mA(Trouble,0 mA) Specifications subject to change without notice <br /> Serial RS-485 Modbus RTU (Modbus •�® Reo aPPRoveo <br /> not FM verified) <br /> 'tM s <br /> Sierra Monitor Corporation 1991 Tarob Ct.Milpitas,CA 95035(408)262-6611 (800)727-4377 Fax:(408)262-9042 <br /> Web site: http://www.sierramonitor.com E-Mail:sierra@sierramonitor.com <br />