Semiconductor Freon gas sensor – MQ139 Freon sensor


Semiconductor Freon gas sensor Introduction

The gas-sensitive material used by the semiconductor Freon gas sensor is solid metal oxide semiconductor material with low conductivity in clean air. When there are gases to be measured in the environment of the Freon sensor, the conductivity of the sensor increases with the increase of the concentration of Freon gas. A simple circuit is used to convert the change in conductivity into an output signal corresponding to the concentration of the gas. When the semiconductor Freon sensor has the characteristics of high sensitivity, good seismic performance, response, fast recovery time, strong anti-interference ability and so on. It is a low-cost semiconductor sensor suitable for refrigerant leak monitoring, Freon leak monitoring and other applications.

Semiconductor Freon gas sensor

Semiconductor Freon gas sensor Features

1, When the machine is small in size, light in weight, easy to install, can be mounted in portable, fixed, pipe type and other appearance sensors used.

2, stainless steel protective net, high protection, easy to clean effective protection from particulate matter and impurities, easy to maintain and use.

3, high-performance chip, breakthrough manufacturing process, product performance significantly improved.

4, long service life, low cost, simple driving circuit.

5, high resolution, high sensitivity, fast response speed, strong anti-interference force.

MQ139 Freon sensor

Semiconductor Freon gas sensor Parameters

Product model: JQ-139

Product type: semiconductor gas sensor

Standard package: Plastic seal

Detected gas: Freon

Detection concentration: 10-1000PPM freon

Loop voltage: ≤24V DC

Load resistance: adjustable

Temperature/humidity: 20°C soil 2°C; 55% soil 5%RH


1. Avoid exposure to volatile silica vapors.

2, avoid sensor exposure to high concentration of corrosive gas.

3, avoid alkali, alkali metal salt, halogen pollution.

4, avoid the sensor contact with water or immersed in water, easy to cause the sensor sensitivity characteristics decline.

5, avoid applying too high voltage, if the voltage applied to the sensor heating is higher than the specified value, even if the sensor has not received physical damage or damage, it will cause damage to the lead/or heater, and cause the sensor sensitive characteristics to decline.

Freon sensor


What is Freon gas?

Freon is a common refrigerant, there are many kinds, common R22, R32, R134a and so on. Freon is generally a gas at room temperature and pressure, slightly aromatic. It is a transparent liquid under low temperature pressure. It can be miscible with halogenated hydrocarbons, monoalcohols or other organic solvents in any proportion, and can also be miscible with fluorine refrigerants.

What is a Freon gas detector?

Freon gas detector, is a portable Freon concentration detection instrument, using imported special electrochemical sensor, small size, light, can be tested in many places, the characteristics of this kind of gas is that users can switch the machine at any time, the battery and sensor can also be changed.

What are the uses of Freon gas?

1, Freon is widely used as refrigerant, foaming agent, cleaning agent, widely used in household appliances, foam, daily chemicals, cars, fire equipment and other fields.

2. The thermal properties of freon refrigerant vary greatly with different chemical composition and structure, and it can be applied to high temperature and medium temperature cryocooler to get used to the requirements of different cooling temperatures.


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