**Low-Concentration Methane Sensor Model: AZ-GJC4S**
**I. Overview**
The AZ-GJC4S low-concentration methane sensor is specifically designed for detecting methane levels in the air of underground coal mines. This advanced sensor provides clear and accurate readings on both the positive and negative sides, making it easier to install and maintain in challenging mine environments. As an intelligent inspection device, all calibration and adjustments can be performed remotely using a control unit, eliminating the need for manual intervention or opening the casing during operation. The sensor offers high precision, stable performance, and reliable operation, ensuring safe and efficient monitoring in hazardous areas.
**II. Main Technical Specifications**
2.1 **Measurement Range**: (0 ~ 4)% CHâ‚„
2.2 **Measurement Error**:
- 0.00 ~ 1.00% CH₄: ±0.10% CH₄
- 1.00 ~ 3.00% CH₄: ±10% of the true value
- 3.00 ~ 4.00% CH₄: ±0.30% CH₄
2.3 **Display Mode**: Four-digit digital display for easy reading.
2.4 **Environmental Conditions**:
- Ambient temperature: (0 ~ 40)°C
- Relative humidity: ≤98% at 25°C
- Atmospheric pressure: (80 ~ 116) kPa
- Wind speed: Not exceeding 8 m/s
- Operating temperature range for coal dust and gas explosion hazards: (-40 ~ 60)°C
2.5 **Power Supply**:
- Working voltage: (9 ~ 24) V DC (intrinsically safe)
- Working current: ≤80 mA
- Features a soft-start function to prevent excessive current upon power-on
- Remote control power supply: 3 V DC (two 1.5V dry batteries), current: 9 mA
2.6 **Explosion-Proof Type**: Intrinsically safe and flameproof design. The circuitry is intrinsically safe, while the catalytic component is explosion-proof.
2.7 **Explosion-Proof Marking**: Ex ib d I
2.8 **Cable Length**: Maximum length between the sensor and substation is ≤2 km.
- Distributed capacitance: < 100 pF/km
This sensor is ideal for use in coal mines where safety and accuracy are critical. It ensures real-time monitoring of methane levels, helping to prevent potential explosions and improve overall safety conditions. For more information or to download technical documentation, visit the official website of Beijing Heng Aode Instrument Co., Ltd.
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