Model SA-100-CG

Combustible Gas Detection Sensor


Model SA-100-CG gas detection sensors are designed to detect and monitor combustible gases in ambient air in the range 0-100% LEL (Lower Explosive Limit). Utilizing catalytic bead technology, the sensor represents a simple and economical solution to assure a safe working environment across a wide range of industrial applications.

The sensor assembly includes a built-in microprocessor control and signal conditioning circuit. HMI and Detector status is via a high visibility multi-color LED. In normal operation, and in a no gas environment, the LED is a steady green. As gas concentrations reach and exceed 10% of full scale sensitivity (10% LEL) the LED switches to a flashing yellow, indicating an early warning level. If the gas concentration reaches 20% of full scale (20% LEL) the LED switches to a flashing bright red indicating a higher danger level. A flashing blue LED indicates a fault condition.

The unit features simple non-intrusive calibration using a magnet and the built-in LED interface or a Blue Tooth app and a suitable portable device. All electronics are contained within a certified explosion-proof housing suitable for installation in hazardous locations. The detector output is a linear 4-20 mA analog signal. SA-100 gas detectors also provide a CAN bus digital output delivering comprehensive performance diagnostics that can be connected to and stored in any one of a number of SafeGuard Analytics safety controllers.


  • Low cost – high level performance
  • High visibility LED status indicators
  • One man non-intrusive calibration
  • Comprehensive fault diagnostics
  • Typical calibration interval 6 months
  • Detector life expectancy 3-5 years
  • Explosion Proof Class I; Div 1; B,C,D
System Specifications

Detector Type: Catalytic Bead; Matched Pair
Detection Method: Diffusion
Detection Range: 0-100 % LEL Combustible Gas
Response/Clearing Time: T50 10s; T90 30s
Accuracy – Repeatability: ± 5% of full scale
Zero – Span Drift: < 2% per month
Indicators: Normal - Steady Green, Alarm Level 1 - Yellow Strobe, Alarm Level 2 - Red Strobe, Fault Blue - Strobe
Faults Monitored: Input Voltage, Signal Loop, Zero Signal, Detector, Processor, Memory, OpCheck®
Detector Life Expectancy: 3-5 years
Area Classification: Explosion Proof Class I; Div 1; Groups BCD Class I; Zone 1, Group IIB+H2
Certifications: CSAus; ATEX; IECex Pending
Warranty: 2 Years

Electrical Specifications

Input Voltage: 10-30 VDC, Nominal 24 VDC
Power Consumption: 2.65 watts; 110 mA DC @ 24 VDC
Output: Linear 4-20 maDC
Communication: Safeguard Analytics LPN
CAN bus 125 kbps

Environmental Specifications

Operating Temperature Range: -40°C to +70°C; -40°F to +158°F
Operating Humidity Range: 0 - 99% non-condensing

Mechanical Specifications

Enclosure Material: 316SS Electro Polished
Dimensions: 6.4"H - 2.95"D; 162mmH - 75mmD
Mounting: 3/4" NPT; M20 Optional
Weight: 2 lbs 3 oz; 990 grams


SA-100-CG Combustible Gas Sensor
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