Formaldehyde tester

Abstract

The invention provides a formaldehyde tester. The formaldehyde tester comprises a sensor, a gas channel and gas chamber unit, a signal acquisition and processing unit and a microprocessor unit, wherein the gas channel and gas chamber unit comprises a sensor cavity for accommodating the sensor, a test gas channel connected with one side of the sensor cavity, a calibration gas channel connected in parallel in the same side of the sensor cavity with the test gas channel as well as an exhaust device arranged on the other side of the sensor cavity, one end of the test gas channel is connected with outside to-be-tested gas, and the other end is connected with the sensor cavity; the signal acquisition and processing unit is electrically connected with the microprocessor unit and the sensor; the exhaust device is electrically connected with the microprocessor unit. The formaldehyde tester can calibrate calibration of the sensor and prevent the sensor from affecting test accuracy due to own drifting, so that a test result is accurate and reliable.

Description

technical field [0001] The invention relates to a formaldehyde tester, which belongs to the field of gas detection. Background technique [0002] Formaldehyde is a harmful gas that can induce various diseases and is carcinogenic. Formaldehyde gas in the home and office environment has become an important cause of harm to human health, and has aroused people's high attention. According to my country's national standards: the maximum allowable concentration of formaldehyde in the room air is 0.08 mg / m3, and the maximum allowable concentration of formaldehyde in public places is 0.10 mg / m3. [0003] At present, the most accurate method for measuring formaldehyde gas is chromatography, but this method requires the help of large precision instruments, which is expensive and cannot be widely used. There is also a color method using chemical reagents to detect the concentration of formaldehyde, but this method requires the use of chemical reagents for detection. The concentration...

AI Technical Summary

Problems solved by technology

[0003] At present, the most accurate method for measuring formaldehyde gas is chromatography, but this method requires the help of large precision instruments, which is expensive and cannot be widely used

There is also a color method using chemical reagents to detect the concentration of formaldehyde, but this method requires the use of chemical reagents for detection. The concentration of formaldehyde can be judged by the color change of the reagent after absorbing external formaldehyde, but the chemical reagent is only One-time use, its test time is long, the result cannot be quantified and it is easy to pollute the environment

[0004] In recent years, people have also developed some formaldehyde testers, but electrochemical sensors are mainly used to quantitatively test the concentration of formaldehyde. The test accuracy is low and the price is high, which hinders the mass use of this small portable test equipment.

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