Electrochemical formaldehyde sensor The electrochemical formaldehyde gas sensor produced by our company is a sensor that can truly monitor continuously without any Gas sampling or gas pump extraction. Suitable for monitoring and use in most environments (-20℃~+50℃) (if special Introduction, can be applied to higher temperatures). This sensor has five major design features: The simple design and structure and few parts make its cost reduced, resulting in a more competitive price. It uses the components of a breath alcohol sensor that has been used in the world for more than 30 years, combined with industrial electricity. The chemical poison gas sensor is designed based on the principle. The accuracy, stability and durability of the breath alcohol sensor have been obtained verification. At the same time, the design of industrial electrochemical toxic gas sensors makes the sensor more adaptable to various extreme conditions such as high temperature, high humidity and Low temperature and low humidity environment. A short and low impedance diffusion path makes its response time very short. The principle of the fuel cell means that it does not need power excitation, it only needs electricity for signal processing and display, so Just a simple small battery unit is enough. Very good stability, allowing a very long calibration cycle during use

Product Structure

working principle working principle The sensor contains a conventional two-electrode fuel cell sensor. The working electrode releases electrons to Counting electrode, and consumption with the decrease of oxygen at the end of the counting electrode, the internal circuit is realized by the ion current in the electrolyte. Assume It is well-designed to facilitate the growth and decline of electrolyte. The growth and decline of the electrolyte varies with changes in ambient temperature and humidity, but it can still be normal Work will not affect the calibration value. Sensor circuit The output current...

of the feedback resistor; for example, use 1000 ohms Ohm resistance value, then an output signal of 5nA will be converted into an output signal of 5mV. Because the sensor may gradually cause deviation in the open circuit state, although it will not damage the product, it will take time To discharge. Therefore, the output terminals are generally short-circuited during storage, so that there will be no obvious long-term deviation. Shift. During use, in order to avoid the increase of the offset when the amplifier is disconnected, you can connect between the two terminals A low-value resistor (typical...

Temperature compensation The temperature drift rate of this sensor is 0.35% per degree Celsius (-20°C~50°C). If the required measurement accuracy is very high, then temperature compensation needs to be added to the circuit. Generally speaking, in Jan In a single circuit, we can implement it by appropriately adding a thermistor to the feedback loop of the operational amplifier (the The thermistor can be corrected by connecting it in series with other resistors). If you use a microprocessor circuit, in the software Under the control, the thermistor compensation will be more accurate. The temperature...

n All electrochemical sensors cannot be completely encapsulated with resin materials, nor can they be immersed in an oxygen-free environment. Otherwise it will damage the performance of the sensor; n All electrochemical sensors cannot be used for a long time in an environment containing corrosive gas. Will damage the sensor; n When the gas zero point is measured, it must be carried out in a clean atmosphere; n When testing and applying the sensor, avoid vertical air intake from the front; n The intake surface of the sensor must not be blocked or polluted; n The waterproof and breathable membrane...