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M11Cs1wra nm"ocorpaiIR Gas Sensor Module Model 5100-28 Product Data Sheet The IR Gas Sensor Module monitors for Methane, Propane, Ethane, or Butane using Infrared technology. The monitor interfaces to the Sentry hazardous gas risk management system or uses a 4-20 mA output signal to interface to other controllers The IR Gas Sensor Module utilizes Non-Dispersive Infrared technology to monitor for combustible gases (Methane and others). Output range is either 0-100% of LEL (default) or percent (%) by volume. This Module requires minimal maintenance with a calibration check once a year. Internal continuous self-diagnostics will automatically indicate any fault or optics problems. The 5100-28 interfaces directly # with the Sierra Monitor Sentry Controller via the Sentry digital bus or directly to other devices using RS-485 Modbus RTU serial output or a 4-20 mA analog output signal. With the Sentry system the ' user has the capability of Modbus serial communications, extensive diagnostic features, multiplexing sensor connections, and field-proven How It Works ' reliability. Most combustible gases absorb infrared light Infrared technology has the benefits of: energy at defined wavelengths, providing an absorption signature for that gas. The principle of • Reduced need for calibration and thus lower an infrared detector is based upon the absorption of 1 operating costs. the infrared light at a specific wavelength as it • Operates in high combustible gas and/or low passes through the gas. The more of the absorbing oxygen environment gas that is present, the more light is absorbed. The ' Can operate in environments where catalytic detector measures the energy from an infrared light bead poisons might exist beam at a wavelength that is absorbed by the gas Rapid recovery after exposure to high and compares it to the energy emitted by the • concentrations of hydrocarbon gas source. The difference in energy received by the (exceeding 100% LEL) detector indicates the level of gas in the atmosphere. ' Specifications: Sensor type: Infrared, Dual Wavelength Electrical Data: Performance Power consumption: 3 watts Dual Range: Connection type: 3 wire Default: 0-100% LEL Methane or Propane Input voltage: 24 VDC nominal: 10-30VDC User Setting: 0-100% by vol. Methane(%Vol not Operating Range: FM verified) Ambient Temp Range: -40 to 140°F(-200 to 600C) Repeatability: +/-1% LEL Relative Humidity: 5-99% Response time: <10 sec to 60%full scale Accuracy: +/- 1%for 0-50% LEL range Construction: +/- 2%for 51-100% LEL range Dimensions: 7.5 x 5.0 x 4.8 inches (HxW' Sensor Life: Typically>5 years eight: ) 2.7 l x 1.3 x 12.2 cm) Weight: 2.7 Ib. (1.3 Kg) Output: Housing: Explosion proof, Class 1, Div. I,Groups B, C, D Display: Fixed and Scrolling LED Performance: Explosion proof, Class 1, Div. 1, Groups C, D ' Relay: 0.25 Amp, High Alarm, Low Alarm, Warranty: 2 years Trouble, all SPDT Approvals: FM Approval FM Signal Output: Sentry digital bus Analog 4-20 mA(Trouble,0 mA) Specifications subject to change without notice ' Serial RS-485 Modbus RTU (Modbus P�,S,E APPROVED not FM verified) SO �hY 5 Sierra Monitor Corporation 1991 Tarob Ct. Milpitas,CA 95035(408)262-6611 (800)727-4377 Fax: (408)262-9042 Web site:http://www.sierramonitor.com E-Mail:sierra@sierramonitor.com