View source for Ks0046 keyestudio MQ-8 Hydrogen Gas Sensor


<br>
==Introduction==
The gas sensitive material used in MQ-8 gas sensor is SnO2, which is of lower electrical conductivity in clean air. <br>
When there is hydrogen in the environment where sensor resides, the electrical conductivity of the sensor increases with the increase of the hydrogen concentration in the air. <br>
The change of electrical conductivity can be converted to the output signal corresponding to that of the gas concentration by using a simple circuit. <br>
The sensitivity of MQ-8 gas sensor to hydrogen is quite high, it can also detect a variety of other gases containing hydrogen. <br>
This sensor is suitable for a variety of applications, is definitely a good catch.<br>
<br>[[File:Ks0046.jpg|500px|frameless|thumb]]<br>

<br>
==Feature==
* good sensitivity to hydrogen in a wide range of concentrations.
* long service life, low cost
* simple drive circuit

<br>
==Specification==
Detectable concentration: 100-1000ppm (hydrogen)
Loop voltage Vc: ≤24V DC
Heating voltage VH: 5.0V±0.1V AC or DC 
Load resistance RL: adjustable
Heating resistance RH: 29±3Ω(Room temperature)
Heating power: PH ≤900mW 
Sensitivity S: Rs(in air)/Rs(1000ppm H2)≥5 
Output voltage Vs: 2.5-4.0V（1000ppm H2）
Concentration slope: α≤0.6(R1000ppm/R400ppm H2)
Temperature ; humidity: 20℃±2℃；55%±5%RH
Standard test circuit: Vc:5.0V±0.1V；VH: 5.0V±0.1V 

<br> 
==Connection Diagram ==
<br>[[File:Ks0042-2.png|700px|frameless|thumb]]<br>


<br>
==Sample Code ==

<pre>
///Arduino Sample Code
void setup()
{
  Serial.begin(9600); //Set serial baud rate at 9600 bps
}
void loop()
{
int val;
val=analogRead(0);//Read Gas value from analog 0
Serial.println(val,DEC);//Print the value to serial port
delay(100);
}
</pre>

<br>[[File:Ks0042-1.png|600px|frameless|thumb]]<br>

<br>
==Application==
* household gas leak alarm
* Industrial-level hydrogen alarm
* Portable gas detector

<br>
==Resources ==

* '''Video'''<br>
http://video.keyestudio.com/ks0040/

* '''PDF'''<br>
https://drive.google.com/open?id=13HovPcXXT_O7PopiELnO4ug_j-kEMWwB


<br>
==Buy from ==

*[https://www.keyestudio.com/keyestudio-mq-8-hydrogen-sensor-detection-module-for-arduino-p0120.html   '''Official Website''']

*[https://www.aliexpress.com/store/product/Keyestudio-MQ-8-Hydrogen-sensor-detection-module-for-Arduino/1452162_32628912079.html?spm=2114.12010612.8148356.39.77321414ddNxgj   Shop on aliexpress]


[[Category: Sensor]]