Catalytic Gas Sensor, C3H8/CH4, 0-100%LEL

Upgrade your safety monitoring system with SUCH good price catalytic gas sensors. Detection range covers 0-100% LEL with response time under 10 seconds, offering reliable sensitivity for methane and propane (response value 12-35mV at 20% LEL). Featuring high sensitivity, low noise characteristics, and a reliable five-year lifespan, it is perfectly suited for industrial automation, safety systems, and gas leak monitoring.

Feature

• High Sensitivity and Rapid Response: The catalytic gas sensor reacts sensitively to combustible gases such as methane and propane, with a T₉₀ response time ≤10 seconds. This ensures rapid detection and alarm activation for hazardous gas leaks, safeguarding safety.
• Wide Measurement Range: Supports detection from 0–100% LEL, precisely covering diverse industrial and residential gas environments to meet multi-scenario safety monitoring needs.
• Stable and Reliable Performance: Operates reliably at temperatures between -40°C and 70°C and humidity levels below 95% RH. Maintains linearity ≤5% to ensure accurate readings and minimize false alarms.
• Durable Structural Design: Features a combination of a plastic base and metal housing for rugged durability. Resists dust and interference, guaranteeing long-term stable operation.

Principle

Catalytic combustion gas sensors operate based on the principle of catalytic combustion. They consist of a detection element and a compensation element paired to form one arm of an electrical bridge. When exposed to combustible gases, the resistance of the detection element increases, causing a change in the bridge's output voltage. This voltage change increases proportionally with rising gas concentration. The compensation element serves as a reference and provides temperature and humidity compensation.

Dimension (unit: mm)

Wiring Definition

When connecting the catalytic gas sensor to the circuit, pin 1 connects to the positive terminal, pin 3 connects to the negative terminal, and pins 2 and 4 are connected together as the signal output terminal. The sensor tube socket marked “D” at the bottom is the detection element, while the tube socket marked “C” at the bottom is the compensation element.

Zero and Sensitivity Stability Curve

In clean air, the absolute value of annual zero drift for the thermal conductivity gas sensor is less than 2mV, and the absolute value of annual sensitivity drift (at 10% CH) is less than 2mV. For short-term storage (within two weeks), stabilization occurs within 8 hours. For long-term storage (one year), stabilization requires 48 hours of aging.

Sensor Curve

Response Curve

Sensitivity Curve