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PDF MQ7 Data sheet ( Hoja de datos )
| Número de pieza | MQ7 | |
| Descripción | GAS SENSOR | |
| Fabricantes | Hanwei | |
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Hay una vista previa y un enlace de descarga de MQ7 (archivo pdf) en la parte inferior de esta página. Total 3 Páginas | ||
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HANWEI ELECTRONICS CO ., LTD
MQ –7
http://www.hwsensor.com
TECHNICAL DATA
MQ-7 GAS SENSOR
FEATURES
* High sensitivity to carbon monoxide
* Stable and long life
APPLICATION
They are used in gas detecting equipment for carbon monoxide(CO) in family and
industry or car.
SPECIFICATIONS
A. Standard work condition
Symbol
Vc
VH (H)
VH (L)
RL
Parameter name
circuit voltage
Heating voltage (high)
Heating voltage (low)
Load resistance
Technical condition
5V±0.1
5V±0.1
1.4V±0.1
Can adjust
Remark
Ac or Dc
Ac or Dc
Ac or Dc
RH
TH (H)
TH (L)
PH
Heating resistance
Heating time (high)
Heating time (low)
Heating consumption
33Ω±5%
60±1 seconds
90±1 seconds
About 350mW
Room temperature
b. Environment conditions
Symbol
Tao
Tas
RH
O2
Parameters
Using temperature
Storage temperature
Relative humidity
Oxygen concentration
c. Sensitivity characteristic
Technical conditions
-20℃-50℃
-20℃-50℃
Less than 95%RH
21%(stand condition)
the oxygen concentration can
affect the sensitivity
characteristic
Remark
Advice using scope
Minimum value is over 2%
symbol
Rs
а(300/100ppm)
Standard working
condition
Preheat time
Parameters
Technical parameters Remark
Surface resistance
In 100ppm
Of sensitive body
2-20k
Carbon Monoxide
Concentration slope rate
Less than 0.5
Rs (300ppm)/Rs(100ppm)
Temperature -20℃±2℃ relative humidity 65%±5% RL:10KΩ±5%
Vc:5V±0.1V VH:5V±0.1V VH:1.4V±0.1V
No less than 48 hours Detecting range:
20ppm-2000ppm carbon monoxide
www.DataSheet4UD..coSmtructure and configuration, basic measuring circuit
Structure and configuration of MQ-7 gas sensor is shown as Fig. 1 (Configuration A or B),
sensor composed by micro AL2O3 ceramic tube, Tin Dioxide (SnO2) sensitive layer, measuring
electrode and heater are fixed into a crust made by plastic and stainless steel net. The heater
provides necessary work conditions for work of sensitive components. The enveloped MQ-7 have
TEL:86-371-67169070 67169080
FAX:86-371-67169090
Email: [email protected]
1 page | ||
| Páginas | Total 3 Páginas | |
| PDF Descargar | [ Datasheet MQ7.PDF ] | |
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