MQ-8 Hydrogen H2 Gas Sensor A Must-Have for Gas Monitoring Systems
MQ-8 Hydrogen H2 Gas Sensor
Profile :
Sensitive material of MQ-8 gas sensor is SnO2,which with lower conductivity in clean air. When hydrogen gas exists, the sensor’s conductivity gets higher along with the gas concentration rising. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit. MQ-8 gas sensor has high sensitivity to hydrogen gas, also has anti-interference to other gases. This sensor can detect hydrogen, especially city gas. It is a kind of low-cost sensor for kinds of applications.
Features :
It has good sensitivity to hydrogen gas in wide range, and has advantages such as long lifespan, low cost and simple drive circuit &etc.
Main Applications :
It is widely used in domestic gas leakage alarm, industrial flammable gas alarm and portable gas detector.
|
Category |
Parameter |
Symbol |
Specification |
Remarks |
|---|---|---|---|---|
| Basic Information | Model | - | MQ-8 | - |
| Sensor Type | - | Semiconductor | - | |
| Standard Encapsulation | - | Bakelite, Metal cap | - | |
| Target Gas | - | Hydrogen (H₂) | - | |
| Detection Range | - | 100～1000 ppm (H₂ gas) | - | |
| Standard Circuit Conditions | Loop Voltage | Vc | ≤24V DC | - |
| Heater Voltage | VH | 5.0V±0.1V AC or DC | - | |
| Load Resistance | RL | Adjustable | - | |
| Sensor Character (Standard Test Conditions) | Heater Resistance | RH | 30Ω±3Ω | Measured at room temperature |
| Heater Consumption | PH | ≤950mW | - | |
| Sensitivity | S | Rs(in air)/Rs(in 1000ppm H₂) ≥ 5 | Rs = Sensor resistance | |
| Output Voltage | Vs | 2.5V～4.0V | Measured in 1000ppm H₂ | |
| Concentration Slope | α | ≤0.6 (R1000ppm/R400ppm H₂) | R = Sensor resistance at specified concentration | |
| Standard Test Conditions | Temperature & Humidity | - | 20℃±2℃；55%±5%RH | - |
| Test Circuit Voltage | - | Vc: 5.0V±0.1V；VH: 5.0V±0.1V | - | |
| Preheat Time | - | Over 48 hours | Required for stable performance | |
| Environmental Requirement | Oxygen Content | - | 21% (not less than 18%) | Affects initial value, sensitivity and repeatability |
| Product Life | Life Span | - | 10 years | Under normal operating conditions |
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