The detection principles of the formaldehyde detector are:

The detection principle of the formaldehyde detector mainly includes the principle of spectrophotometry, the principle of electrochemistry, and the principle of semiconductor. The spectrophotometric method has high accuracy, but the result data is slow. It usually takes two or three days. It is mainly used in laboratory professional instruments and used for scientific research. The advantages of electrochemical principles are: fast reaction speed, accuracy (applicable to ppm level), good stability, and quantitative detection; the disadvantage is that the service life is not long, which is about 5 years. The semiconductor principle has poor stability and can only be qualitatively judged. It does not meet the digital display requirements of the instrument, and it is generally not used on the instrument.

How to choose the right formaldehyde detector?

First, look at the sensor. The formaldehyde detector usually adopts the electrochemical sensor method, which has been proved by domestic and foreign authorities. First of all, "hope". Observe the sensor type through the air inlet of the detector. The electrochemical sensor is relatively large with a white diaphragm, and the semiconductor sensor is small in size, and the color is generally gray or black. Secondly, "sniff, ask." You can consult the merchant for the sensor type. If it is a semiconductor, it will not be considered directly. If you buy it, you can't measure formaldehyde. Again, "cut". Looking at the price, a few hundred pieces of formaldehyde detectors must be based on semiconductor detection principles, so they can be ignored.

Second, look at accuracy. The national standard GBT18883-2002 "Indoor Air Quality Standard", the formaldehyde concentration is accurate to two decimal places, that is, accurate to 0.01mg/m3, and the products of regular manufacturers are designed in strict accordance with national standards.

Third, look at calibration. Regular manufacturers have complete R&D and production equipment, and testing instruments must be calibrated in the calibration warehouse before leaving the factory to ensure product accuracy.

Fourth, look at machine time. Standby time is the simplest and most effective way to determine whether a formaldehyde detector is an electrochemical sensor or a semiconductor sensor. The electrochemical sensor's working power is very small, and the main power consumption of the instrument comes from the circuit board. The semiconductor sensor works by heating, and the power consumption is more than 10 times that of the electrochemical sensor. Normally, the standby time of an electrochemical sensor's formaldehyde detector is more than 5 days, and the standby time of a semiconductor sensor's formaldehyde detector will not exceed 12 hours.

Fifth, look at the manufacturer’s qualifications and product qualifications. First, check whether the manufacturer has a formal website, search for the manufacturer's name, such as "Phoebes Technology"（公司网站链接https://www.protech-instruments.com/）, a professional instrument manufacturer. Regular manufacturers can find the official website. Learn about the company's relevant information from the official website, understand the company's team, and production qualifications.