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Question: Can gas sensors guarantee safe production?

by:Rika Sensors     2021-10-28
Question: Can gas sensors guarantee safe production?
Now with the continuous development of industry, more and more gases are discharged into our living environment, and many of them will have an adverse effect on our production and life. According to the nature of the hazards caused by harmful gases, we can divide them into two categories: flammable gases and toxic gases.

Combustible gases can be hidden in undetected corners and continue to accumulate. When the concentration of these gases reaches the optimal ratio, they are easily ignited by sparks or heat sources and explode. Computer rooms, chemical plants, etc. are the most common; there are relatively many types of toxic gases, but most of them have no explosion hazard, but even very low concentrations can cause great harm to humans and even threaten lives.

When people realize the hazards of these gases, they begin to detect various gases in the environment. In this way, more and more gas sensors have been developed and entered the market.

A gas sensor is essentially a device that converts the composition and concentration of a certain gas into information that can be used by personnel, instruments, computers, etc. From an industrial perspective, the commonly used gas sensor types are: semiconductor gas sensors, solid gas sensors, catalytic combustion gas sensors, optical gas sensors, and electrochemical gas sensors. Today I will take you to learn about electrochemical gas sensors.

The electrochemical sensor is based on the electrochemical properties of the object to be measured and converts the chemical quantity to be measured into an electrical quantity for sensing detection. The earliest electrochemical sensors were used to detect oxygen, and it was not until the 1980s that they began to be applied to the monitoring of various toxic gases.

Electrochemical gas sensors are generally used to measure the content of some gases dissolved in solutions or for environmental monitoring, such as oxygen, carbon dioxide, ammonia, hydrogen cyanide and other gases, and can adapt to harsh environments such as high temperature and high pressure. High concentration occasions.

Working principle

Most electrochemical sensors adopt the diffusion type. In this mode, the target air molecules enter the sensor through the anti-condensation membrane, diffuse and filter through the capillary, and then reach the sensing electrode through the hydrophobic membrane. On the surface of the electrode, an appropriate amount of gas is oxidized or reduced on the electrode surface, thereby generating or consuming electrons to generate a current, which is amplified by an amplifier connected to the sensor to form a sufficient electrical signal to display the target gas concentration in the area.

The gas sensitivity usually changes with changes in temperature. When the temperature changes, the gas sensitivity also changes nonlinearly. Therefore, in order to ensure the performance of the sensor, the sensor mostly adds a 'temperature compensation' mechanism. The temperature compensation algorithm ensures that the sensor readings remain consistent.

With the continuous development of Internet of Things technology, in order to ensure the smooth progress of enterprise safety production and avoid accidents caused by inadequate supervision of harmful gases, the application of gas detection in industrial enterprises has become more and more extensive. In the production process, daily leak detection, maintenance detection, emergency detection when abnormalities occur, and entry detection when workers enter toxic and hazardous substances or work in limited spaces all require gas sensors to detect and judge in advance and control accidents.

If the production process can regularly carry out equipment maintenance and environmental safety inspections, early detection of potential safety problems, and control it to the minimum range, maybe there will not be so many people killed in production accidents .



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