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Persona de contacto Mr. Wilson
6-703, FUYUAN COMMUNITY, YUFU ROAD, LONGGANG DISTRICT, SHENZHEN, CHINA, Muping, Sichuan
Wrobot Mini Mq7 High
Sensitivity Gas Sensor
Specification:
1, High
sensitivity to Combustible gas in wide range.
2, Can
detect CO gas.
3, Adjustable Sensitivity, Stable
Performance.
4, 5V Working Voltage, support both the
output digital value and the output analog value.
5, Port
explanation: DO for digital output, AO for analog
output.
6, Applicable to a variety of platforms including
Arduino / AVR / ARM.
D.
Structure 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 6 pin, 4 of
them are used to fetch signals, and other 2 are used for providing
heating current.
Standard
circuit:
As shown in Fig 2, standard
measuring circuit of MQ*7 sensitive components consists of 2 parts.
One Is heating circuit having time control function (the High
voltage and the low voltage work Circularly ). The second is the
signal output circuit, It can accurately respond changes of surface
Resistance of the sensor.
SENSITVITY
ADJUSTMENT
Resistance value of MQ*7 is
difference to various kinds and various concentration gases. So,
When Using this components, sensitivity adjustment is very
necessary. We recommend that you calibrate the Detector for **0ppm
CO in air and use value of Load resistance that( RL) about *0
KΩ (5KΩ To *7 KΩ ).
When
accurately measuring, the proper alarm point for the gas detector
should be determined after Considering the temperature and humidity
influence.
If you need more PDF file, pls
contct me soon.
País: | China |
N º de Modelo: | - |
Precio FOB: | Obtener el precio más reciente |
Lugar de origen: | - |
Precio de pedido mínimo: | - |
Cantidad de pedido mínimo: | - |
Detalle de embalaje: | - |
El tiempo de entrega: | - |
Capacidad de suministro: | - |
Tipo de pago: | - |
Grupo de productos : | arduino board and accessories |