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1 M11C sierra monitor corporation 1 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 1 1 �L 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 reliability. Infrared technology has the benefits of: • Reduced need for calibration and thus lower operating costs. • Operates in high combustible gas and/or low oxygen environment • Can operate in environments where catalytic bead poisons might exist • Rapid recovery after exposure to high concentrations of hydrocarbon gas (exceeding 100% LEL) Specifications: Sensor type: Infrared, Dual Wavelength Performance (HxWxD) Dual Range: Weight: Default: 0-100% LEL Methane or Propane User Setting: 0-100% by vol. Methane (%Vol not Explosion proof, Class 1, Div. FM verified) Repeatability: +/-l% LEL Response time: <10 sec to 60% full scale Accuracy: +/- 1 % for 0-50% LEL range +/- 2% for 51-100% LEL range Sensor Life: Typically >5 years Output: Display: Fixed and Scrolling LED Relay: 0.25 Amp, High Alarm, Low Alarm, Trouble, all SPDT Signal Output: Sentry digital bus Analog 4-20 mA (Trouble, 0 mA) Serial RS -485 Modbus RTU (Modbus not FM verified) IR Gas Sensor Module Model 5100-28 Product Data Sheet How It Works Most combustible gases absorb infrared light energy at defined wavelengths, providing an absorption signature for that gas. The principle of an infrared detector is based upon the absorption of the infrared light at a specific wavelength as it passes through the gas. The more of the absorbing gas that is present, the more light is absorbed. The detector measures the energy from an infrared light beam at a wavelength that is absorbed by the gas and compares it to the energy emitted by the source. The difference in energy received by the detector indicates the level of gas in the atmosphere. Electrical Data: Power consumption: Connection type: Input voltage: Operating Range: Ambient Temp Range: Relative Humidity: 3 watts 3 wire 24 VDC nominal: 10-30VDC -40 to 140OF (-200 to 600C) 5-99% Construction: Dimensions: 7.5 x 5.0 x 4.8 inches (HxWxD) (21.6 x 12.7 x 12.2 cm) Weight: 2.7 Ib. (1.3 Kg) Housing: Explosion proof, Class 1, Div. Performance: Explosion proof, Class 1, Div. Warranty: 2 years Approvals: FM Approval I, Groups B, C, D 1, Groups C, D Specifications subject to change without notice �vsTfgr g� � '<M vS FM APPROVED 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