Tuesday, April 29, 2014

MQ-8 hydrogen gas sensor semiconductors.

MQ-8 hydrogen gas sensor semiconductors.

Sensitive material MQ-8 gas sensor is used in clean air low conductivity tin oxide (SnO2).When the sensor is exposed in the presence of hydrogen, conductivity sensor with increasing concentration of combustible gases in air increases. Using a simple circuit to convert the change in conductivity of the gas concentration corresponding to the output signal. 



MQ-8 hydrogen gas sensor of high sensitivity, the monitoring of the other hydrogen-containing gas is also very satisfactory. This sensor can detect a wide range of hydrogen gas, city gas in particular, is a low-cost sensor for a variety of applications.


Feature 

  • In a wide range of concentrations with good sensitivity to hydrogen 
  • Long-life, low cost 
  • Simple drive circuit can be



Technical indicators
Model
MQ-8
Product Type
Semiconductor gas sensor
Standard package
Bakelite (black bakelite)
Detection of gas
Hydrogen
Detectable concentration
100-1000ppm (hydrogen)
Standard circuit conditions
Circuit voltage
c
≤ 24V DC
Heating voltage
H
5.0V ± 0.2V ACorDC
Load Resistance
L
Adjustable
Under standard test conditions sensing Characteristics
Heating resistor
H
31Ω ± 3Ω (room temperature)
Heating consumption
H
≤ 900mW
Sensing Resistance
s
2KΩ-20KΩ (in 1000ppm H 2)
Sensitivity
S
Rs (in air) / Rs (1000ppm hydrogen) ≥ 5
Concentration gradient
α
≤ 0.6 (R 5000ppm / R3000ppm CH 4)
Standard Test Conditions
Temperature, humidity
20 ℃ ± 2 ℃; 65% ± 5% RH
Standard Test Circuit
Vc: 5.0V ± 0.1V;
H: 5.0V ± 0.1V
Warm-up time
Less than 48 hours