$26.00
Application:It is widely used in domestic CO gas leakage alarm, industrial CO gas alarm and portable CO gas detector.
Feature:It has good sensitivity to carbon monoxide in wide range, and has advantages such as long lifespan, low cost and simple drive circuit &etc.

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Availability: 495 In Stock

Production Description:
Sensitive material of MQ-7B gas sensor is SnO2, which with lower conductivity in clean air. It make detection by method of cycle high and low temperature, and detect CO at low temperature (heated by 1.5V).The sensor’s conductivity gets higher along with the CO gas concentration rising. At high temperature (heated by 5.0V),it cleans the other gases adsorbed at low temperature. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit.
Feature:
It has good sensitivity to carbon monoxide in wide range, and has advantages such as long lifespan, low cost and simple drive circuit &etc.
Application:
It is widely used in domestic CO gas leakage alarm, industrial CO gas alarm and portable CO gas detector.
Technical Parameters:

Model

MQ-7B

Sensor Type

Semiconductor

Standard Encapsulation

Plastic cap

Target Gas

carbon monoxide

Detection range

10~500ppm CO

Standard Circuit

Conditions

Loop Voltage

Vc

5.0V±0.1V  DC

Heater Voltage

VH

5.0V±0.1V AC or DC(High temp.)

1.5V±0.1V AC or DC(Low temp.)

Heater Time

TL

60 S±1S(High temp.)

90 S±1S(Low temp.)

Load Resistance

RL

Adjustable

Sensor character under standard test conditions

Heater Resistance

RH

30Ω±3Ω (room temp.)

Heater consumption

PH

≤950mW

Sensitivity

S

Rs(in air)/Rs(in 150ppm CO)≥5

Output Voltage

Vs

2.5V~4.3V (in 150ppm CO)

Concentration Slope

α

≤0.6(R300ppm/R50ppmCO)

Standard test conditions

Tem.  Humidity

20℃±2℃;55%±5%RH

Standard test circuit

Vc:5.0V±0.1V;

VH (High temp.): 5.0V±0.1V

VH (Low temp.): 1.5V±0.1V

Preheat time

Not less than 48 hours

O2 content

21%(not less than 18%)

O2 concentration effects initial value, sensitivity and repeatability.

Preheat time

Over 48 hours

Lifespan

10years


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We provide Worldwide Shipping by DHL, Fedex, Standard shipping (China Post e-Packet) and some other shipping ways on ALL ITEMS!

2. SERVICE TRANSIT TIME is provided by the carrier.
  • Reference Delivery time (working days):
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  • China Post e-Packet : 15-35 days
Note:

Transit times may vary, particularly during the holiday season.

We suggest you choose Expedited Shipping(DHL or FedEx) to ensure the products reach your home fast & safety.

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