This post explains for the gas sensor.

The Part Number is MQ-135, MQ135.

The function of this semiconductor is Gas Sensor.

Manufacturer: Hanwei Electronics

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Description

The MQ-135 is a gas sensor module used to detect a variety of harmful gases in the air. It is commonly used in air quality monitoring devices, gas leakage detectors, and environmental monitoring systems.

Features:

1. Wide detecting scope

2. Fast response and High sensitivity

3. Stable and long life

4. Simple drive circuit

 

Applications:

They are used in air quality control equipments for buildings/offices, are suitable for detecting
of NH3, NOx, alcohol, Benzene, smoke, CO2 ,etc

1. Air quality monitoring: It can be used in air quality monitoring systems to detect the concentration of harmful gases and help assess air pollution levels.

2. Gas leakage detection: The sensor can be incorporated into gas leakage detection devices to alert users in case of gas leaks.

3. Indoor air quality monitoring: It can be used to monitor the air quality inside homes, offices, and buildings to ensure a healthy and safe environment.

4. Environmental monitoring: The sensor can be deployed in environmental monitoring systems to track pollutant levels in various locations.

SPECIFICATIONS

A. Standard work condition Symbol Vc VH RL RH PH Symbol Tao Tas RH O2 Parameter name Circuit voltage Heating voltage Load resistance Heater resistance Heating consumption Technical condition 5V±0.1 5V±0.1 can adjust 33Ω ±5% less than 800mw Technical condition -10℃…+45℃ -20℃…+70℃ less than 95%Rh 21%(standard condition)Oxygen concentration can affect sensitivity Technical parameter 30KΩ -200KΩ (100ppm NH3 ) ≤ 0.65 Vc:5V±0.1 Vh: 5V±0.1 Remarks AC OR DC ACOR DC Room Tem B. Environment condition Parameter name Using Tem Storage Tem Related humidity Oxygen concentration Remarks min […]

MQ-135 PDF Datasheet

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Part Number: MQ-4

Function: Semiconductor Sensor for Flammable Gas

Manufacturer: Henan Hanwei Electronics

Images:

 

Description

Sensitive material of MQ-4 gas sensor is SnO2, which with lower conductivity in clean air. When the target combustible gas exist, The sensor’s conductivity is more higher along with the gas concentration rising. Please use simple electrocircuit, Convert change of conductivity to correspond output signal of gas concentration.

Gas sensor has high sensitity to Methane, also to Propane and Butane. The sensor could be used to detect different combustible gas, especially Methane, it is with low cost and suitable for different application. Character – Good sensitivity to Combustible gas in wide range – High sensitivity to Natural gas – Long life and low cost – Simple drive circuit Configuration Application – Domestic gas leakage detector – Industrial Combustible gas detector – Portable gas detector Technical Data Basic test loop Model No. Sensor Type Standard Encapsulation Detection Gas Concentration Loop Voltage Vc Circuit Heater Voltage Load Resistance VH RL Heater Resistance RH Character Heater consumption Sensing Resistance PH Rs Sensitivity S Slope α Tem. Humidity Condition Standard test circuit Preheat time MQ-4 Semiconductor Bakelite (Black Bakelite) Natural gas.

The above is basic test circuit of the sensor. The sensor need to be put 2 voltage, heater voltage（VH）and test voltage（VC）. VH used to supply certified working temperature to the sensor, while VC used to detect voltage (VRL) on load resistance （RL）whom is in series with sensor. The sensor has light polarity, Vc need DC power. VC and VH could use same power circuit with precondition to assure performance of sensor. In order to make the sensor with better performance, suitable RL value is needed: Power of Sensitivity body(Ps): Tel: 86-371-67169070/80 Fax: 86-371-67169090  […]

The gas sensor is functionally based on the wet pulse capacitor principle and contains a highly sensitive combustion sensor internally used to detect methane gas. This sensor responds when the methane concentration rises above a certain level, and is useful for detecting environmental hazards due to gas leaks or lack of oxygen.

MQ-4 PDF Datasheet