GAS SENSOR
Description
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HANWEI ELETRONICS CO.
,LTD
MQ-306
http://www.
hwsensor.
com
GAS SENSOR
MQ-306
for FLAMMABLE GAS
* High sensitivity * Low power consumption * Miniature-size
The MQ-306 is a tin dioxide semiconductor gas sensor which has a high sensitivity to Flammable Gas with quick response speed.
This model is suitable for LPG,LNG, iso-butane,propane,H 2 detection such as portable gas detector.
Structure
Gas sensitive semiconductor material is a mini bead type and a heater coil and electrode wire are embedded in the element.
The sensing element is installed in the metal housing which uses double stainless steel mesh (100 mesh) in the path of gas flow.
The mesh is an anti-explosion feature (Fig 1).
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Operating conditions
Fig 2 shows the standard operating circuit for this model.
The change of the sensor resistance (R S ) is obtained as the change of the output voltage across the fixed or variable resistor (R L ).
In order to obtain the best performance and specified characteristics, the values of the heater voltage (V
H
) circuit voltage (V C ) and load
resistance (R L ) must be within the range of values given in the standard operating conditions shown in the Specification table on the next page.
Sensitivity characteristics
Fig 3 shows the sensitivity characteristics curves of the MQ-306 (typical data).
Sensitivity characteristics of the gas sensors are expressed by the relationship between the sensor resistance and gas concentration.
The sensor resistance decreases with an increase of gas concentration based on a logarithmic function.
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DataSheet 4 U .
com
www.
DataSheet4U.
com
HANWEI ELETRONICS CO.
,LTD
MQ-306
http://www.
hwsensor.
com
A.
Standard Operating conditions
Symbol Parameter Specification Conditions etc.
VH VC
Heater voltage Circuit voltage Load resistance Heater resistance Heater current Heater power consumption Power dissipa...
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