Infrared Methane Sensor (CH4 Sensor) - MH-742B
High sensitivity, high resolution;
5V power supply, low power consumption;
Provides UART and 0.4V~2V analog voltage signal multiple output modes;
Fast response and recovery characteristics;
Temperature compensation, excellent linear output;
Excellent stability;
Long service life;
No poisoning;
Anti-water vapor interference;
Product Introduction
1. MH-742B Infrared Methane Sensor (CH4 Sensor) Product Description
The MH-742B sensor is a universal intelligent sensor that uses non-dispersive infrared (NDIR) principle to detect hydrocarbon gases in the air. It features excellent selectivity, no oxygen dependence, stable performance, and long lifespan. It has a built-in temperature sensor for temperature compensation. MH-742B combines mature infrared absorption gas detection technology with micro-machining and sophisticated circuit design to create a compact, high-performance infrared gas sensor. It can be widely used in fire detection, explosive gas detection, etc.
It meets the requirements of AQ6211-2008 "Non-dispersive infrared methane sensor for coal mines" issued by the State Administration of Work Safety on November 19, 2008, and implemented on January 1, 2009.
The design, manufacturing, and verification of this product follow the following national standards:
GB3836.1-2000 "Electrical apparatus for explosive gas atmospheres - Part 1: General requirements"
GB3836.9-2000 "Electrical apparatus for explosive gas atmospheres - Part 9: Encapsulation type 'm'"
GB4208-93 "Degrees of protection provided by enclosures (IP code)"
GB/T13384-92 "Packaging technical conditions for mechanical and electrical products"
2. MH-742B Infrared Methane Sensor (CH4 Sensor) Features
High sensitivity, high resolution;
5V power supply, low power consumption;
Provides UART and 0.4V~2V analog voltage signal multiple output modes;
Fast response and recovery characteristics;
Temperature compensation, excellent linear output;
Excellent stability;
Long service life;
No poisoning;
Anti-water vapor interference;
3. MH-742B Infrared Methane Sensor (CH4 Sensor) Main Applications
Widely used in fire detection, explosive gas detection, etc.
4. MH-742B Infrared Methane Sensor (CH4 Sensor) Technical Specifications
| Operating Voltage | 4.5~5.5V DC |
| Output Mode | UART 0.4V~2V |
| Interface Level | 5V |
| Measurement Range | Selectable within 0~100% vol (see Table 2) |
| Warm-up Time | 90s |
| Response Time | T90<30s |
| Repeatability | Zero Point < ±10ppm |
| SPAN | <± 30ppm |
| Long-term Drift | Zero Point < ±30ppm/month |
| SPAN | < ±30ppm/month |
| Temperature Range | -40°C ~70°C |
| Humidity Range | 0~95%RH |
| Lifespan | >5 years |
