MQ-135 Air Quality Gas وحدة حساس

MQ-135 Air Quality Gas Sensor Module

The MQ-135 Air Quality Sensor is a popular sensor module used for detecting air quality and measuring various gases, including ammonia (NH₃), nitrogen oxide (NO), alcohol, benzene, carbon dioxide (CO₂), and smoke. It is commonly used in air quality monitoring applications, environmental monitoring, and industrial control systems. The sensor detects the concentration of benzene, alcohol and smoke in the air, the result can be obtained measuring the voltage on the analog output. The system is supplied with the voltage from ZKEEP0Z to ZKEEP1Z. It has a digital and analog output, making it compatible with most of the commissioning modules including Raspberry Pi and Arduino.

Features

• Wide detection range for multiple gases.
• High sensitivity with fast response time.
• Stable performance with long operational life.
• Dual analog and digital output options.
• Adjustable sensitivity through onboard potentiometer.
• Simple drive circuit for easy interfacing.
• Compact design with mounting holes for easy installation.

Specifications

Parameter

Value

Operating Voltage

5VDC

Power Consumption

≤ZKEEP2Z

Detection Range

10–1000ppm

Analog Output

0–ZKEEP3Z

Digital Output

ZKEEP4Z or ZKEEP5Z (TTL Logic)

Preheat Time

≥24 hours

Operating Temperature

-ZKEEP6Z to ZKEEP7Z

Storage Temperature

-ZKEEP8Z to ZKEEP9Z

Humidity Range

<ZKEEP10ZRH

Heater Resistance

33Ω±5%

Load Resistance

Adjustable

Dimensions

ZKEEP11Z x ZKEEP12Z x ZKEEP13Z

PINOUT

Pin No:

Pin Name:

Description

For Module

1

Vcc

Used to power the sensor, Generally the operating voltage is +ZKEEP14Z.

2

Ground

Used to connect the module to system ground.

3

Digital Out

You can also use this sensor to get digital output from this pin, by setting a threshold value using the potentiometer.

4

Analog Out

This pin outputs 0-ZKEEP15Z analog voltage based on the intensity of the gas.

For Sensor

1

H -Pins

Out of the two H pins, one pin is connected to supply and the other to ground

ZKEEP16Z-Pins

The A pins and B pins are interchangeable. These pins will be tied to the Supply voltage.

3

B-Pins

A pins and B pins are interchangeable. One pin will act as output while the other will be pulled to ground.

Applications

• Indoor air quality monitoring systems.
• Industrial emission detection.
• Smart home environmental sensing.
• Automotive cabin air quality assessment.
• Portable air pollution detectors.

Datasheet

• MQ-135 Sensor.