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PDF ( 数据手册 , 数据表 ) MQ-306

零件编号 MQ-306
描述 GAS SENSOR
制造商 Hanwei
LOGO Hanwei LOGO 


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MQ-306 数据手册, 描述, 功能
www.DataSheet4U.com
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,H2 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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