Target: CO
Model: MQ-7B
Detection range: 10-500ppm
Detection principle: Semiconductor
Characteristics: Good sensitivity to CO
Size: φ16.7×9.4
Working conditions: Loop Voltage:5±0.1V
High temp.heater voltage:5±0.1V
Low temp.heater voltage:1.5±0.1V
Notes: Low temperature 90s detection, high temperature 60s cleaning

MQ-7B Manual download
Get Price Whatsapp

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.

Application

It is widely used in domestic CO gas leakage alarm, industrial CO gas alarm and portable CO gas detector.

Features

It has good sensitivity to carbon monoxide in wide range, and has advantages such as long lifespan, low cost and simple drive circuit &etc.

Specifications

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

* The description and specifications might be changed without notice. Please contact us for the latest information before placing orders.

Technical Support:

Customized technical design and function, LOGO and package are available without extra charge (including molding fee) for mass volume.

The sensors don't have sleeping mode. It can be set in program if needed.

All Winsen products go through strict inspections and tests to make sure they are 100% qualified before shipping out.

The sensor has been fully tested (not calibrated) before leaving the factory, but the module will be calibrated before leaving the factory.

However, after transportation and storage, the environment conditions change, and the surface of the sensor absorbs moisture, mixed gas, pollution matters, etc. It is recommended that customers perform aging and calibration after sensors become stable according to the program and use occasions of the whole device.

15﹪-90﹪RH without condensation,greater or less than this range or long-term high temperature and high humidity will affect the life of the sensor.

Our sensors are certified with CE, 3C, ROHS, anti-explosion, fire prevention, and coal mining safety according to different applications. And we provide assistance for new certification.

Many factors can cause the sensor to fail such as broken wires in transportation, poisoning, falling off of the sensitive material, damage to the heating wire (device), etc. Please find specific cause in each category with Winsen’s aftersales.

Winsen provides professional consultation and service before and after sales. We will recommend the best fitting sensor for your demand. If you have any problem, don’t hesitate to email us to sales@winsensor.com

Due to high volume of daily incoming emails and time zone difference, we may not be able to reply your emails immediately. But we will reply to your inquiry in 24 business hours.

LEADING GAS SENSING SOLUTION SUPPLIER

RELATED PRODUCTS