• Optical NDIR sensor technology
• Sensitivity range: 0-5000 ppm CH4
• Minimum detectable level: 100 ppm
• Output: Modbus RTU 9600 bps
• No periodic calibration required
• Annual bump test and zero recommended
• Life expectancy: > 10 years

The document describes the Model SA-5100-CH4, a highly sensitive CH4 sensor utilizing non-dispersive infrared (NDIR) technology for methane detection. It is designed for environments requiring reliable gas monitoring without frequent calibration.

• Electrical Specifications: Input Voltage: 10-30 VDC, Nominal 24VDC; Optional 110/220 VAC Module; Power Consumption: 400 milliwatts (gas measurement module), ~2.5 watts (with color local display); Serial Output: Modbus RTU 9600 bps; Optional Local Alarm Relays: Alarm level 1 & 2 + Fault, Form “C” 2A contacts.
• Environmental: Temperature Range: –40°F to +158°F (-40°C to +70°C); Humidity Range: 15-95% non-condensing.
• Mechanical: Enclosure Material: Electropolished 316 stainless steel; Dimensions: 3.4” OD, 7.35” L; 12” W, 5” D, 4.75” H.
• System: Detector Type: Non-dispersive infrared (NDIR) HC absorption; Range of Sensitivity: 0-5000 ppm CH4; Minimum Detectable Level: 100 ppm ± 25 ppm; Detection Method: Diffusion captive open path optical chamber; Warranty: 2 Years.

Flame Proof: Class I; Division 1; Groups BCD; Class I; Zone I; Group IIB +H2.

• Various junction boxes and modules including LoRaWAN and MODBUS transmitter modules.

Includes optional digital display and a portable user interface kit with a magnetic wand.

• Zero stability, response time, span drift, signal stability, and signal strength are key performance metrics.

Provides response factors for various gases, with methane having a response factor of 1.0.