CO sensor, also known as carbon monoxide sensor, belongs to chemical sensor. Chemical sensors are mainly composed of two parts: conduction or conversion system. The identification system connects a chemical parameter (often concentration) of the substance to be measured with the conduction system. It has two main functions: selectively interact with the object to be measured, and convert the measured chemical parameters into a signal that can be generated by the conduction system.

Molecular recognition system is the key factor to determine the whole chemical sensor. Therefore, the main problem of chemical sensor research is the selection of molecular recognition system and how to connect the molecular recognition system with the appropriate conduction system.

Application analysis of CO sensor in fire alarm

The conduction system of the chemical sensor receives the response signal of the identification system, and transmits the response signal to the electronic system in the form of voltage, current or light intensity through the electrode, optical fiber or quality sensitive element for amplification or conversion output. Finally, the response signal of the identification system is transformed into a signal that can be used for analysis, and the amount of the object to be measured in the sample is detected.

The chemical carbon monoxide gas sensor adopts closed structure design, and its structure is composed of electrode, filter, breathable membrane, electrolyte, electrode outlet (PIN), shell, etc.

Carbon monoxide gas sensor is used together with the alarm. It is the core detection element in the alarm. It takes constant potential electrolysis as the basic principle. When carbon monoxide diffuses to the gas sensor, its output terminal generates current output and is provided to the sampling circuit in the alarm, which plays the role of converting chemical energy into electrical energy. When the gas concentration changes, the output current of the gas sensor also changes in direct proportion. The output is converted and amplified by the intermediate circuit of the alarm to drive different actuators to complete the acoustic, optical and electrical detection and alarm functions. Together with the corresponding control devices, it forms an environmental detection or monitoring alarm system.

During the high temperature in summer, spontaneous combustion of buses occurs from time to time. How to prevent Bus spontaneous combustion is also particularly important. In order to prevent accidents, installing a carbon monoxide sensor for most buses to monitor buses is obviously a good preventive measure to ensure bus driving safety. Generally speaking, Bus spontaneous combustion accidents are related to the long service life of vehicles and the aging of internal lines. Generally, vehicles with long service life and vehicles with rear engine are prone to accidents such as fire due to excessive temperature in the engine compartment during operation.

However, it is difficult for drivers of rear engine vehicles to find problems such as excessive engine temperature. Therefore, installing carbon monoxide sensor for alarm can play a great role. Bus companies install carbon monoxide sensors on some buses. When the engine fires and carbon monoxide reaches the set threshold, it will automatically alarm. The installation of carbon monoxide sensor can effectively improve various safety hazards of the engine, so as to ensure driving safety and passenger safety.

At present, “energy conservation and emission reduction” is one of the main directions of global industrial development. On the one hand, it refers to the need to continue to develop the “energy conservation and emission reduction” technology of internal combustion engine, on the other hand, it refers to the need to strengthen the development of new energy vehicles.

In addition, in practical application, because the battery and driver are also important safety components of hybrid / electric vehicle, the requirements for the reliability and seismic resistance of the sensor are also high. It is necessary to provide the best comprehensive solution from the aspects of electronic component selection, process and reliability verification.

Responsible editor; zl

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