The earliest electrochemical sensor can be traced back to the 1950s, when used for oxygen monitoring.By the mid -1980s, small electrochemical sensors began to detect a variety of different toxic gases within the PEL range, and showed good sensitivity and selectivity.At present, in order to protect personal safety, various electrochemical sensors are widely used in many static and mobile applications.
Features of electrochemical sensor
On the three -electrode sensor, a jumper is usually connected to the working electrode and reference electrodes.If it is removed during the storage process, the sensor needs to be stable for a long time and prepare to use it.Some sensors require bias between the electrodes, and in this case, the sensor has an electronic circuit for power supply by the Jiufu battery when leaving the factory.The stability of the sensor takes 30 minutes to 24 hours, and it takes three weeks to continue to be stable.
Advantages and disadvantages of electrochemical sensors
Advantages of electrochemical sensors: The use of electrochemical sensors can accurately measure some odors, as well as can analyze protein, can also be used for new drug research and development and disease treatment. These are all possible.And the detection speed is relatively fast, simple, convenient, and accounting the most important thing is that the cost is relatively low, which can be used in combination with other technologies, so the chemical sensor has become a hot spot for research.The disadvantages of electrochemical sensors: The main disadvantage of electrochemical sensors is that the life span is not long. Usually it needs to be replaced once to three years. Of course, this is not all of them.If, life can also be extended.
Electrochemical sensor classification
According to the sensor, chemical sensors can be divided into contact and non -contact chemical sensors.There are two structures of chemical sensors: one is a separate sensor.Such as ion sensor, liquid film or solid membrane has a receiver function, the film completes the conversion function of the electrical signal, and the acceptance and conversion parts are separated, which is conducive to optimizing each function separately; the other is the assembly integrated sensor.Such as semiconductor gas sensors, molecular capture functions and current conversion functions are performed in the same part, which is conducive to the miniaturization of chemical sensors.
Electrochemical sensor life
The expected life of electrochemical sensors depends on several factors, including the environmental conditions of the use of gas and sensors to be detected.Generally speaking, the specified life expectancy is one to three years.In actual, the expected life span mainly depends on the total amount of gas exposed in the use of sensors and other environmental conditions, such as temperature, pressure and humidity.
Principle of electrochemical sensor
The electrochemical sensor works by reacting with the measured gas and generating an electrical signal that is proportional to the gas concentration.The typical electrochemical sensor consists of a sensor electrode (or work electrode) and the electrode, and is separated by a thin electrolyte.The gas first reacts with the sensor through the tiny hair tube -type opening, and then the hydrophobic barrier layer is finally reached to the electrode surface.This method can be used to allow an appropriate amount of gas to react with the sensor electrode to form a sufficient electrical signal while preventing the electrolyte from leaking out the sensor.

Related tags： Machinery