Intelligent formaldehyde detector

Abstract

The invention provides an intelligent formaldehyde detector, capable of automatically performing intelligent formaldehyde concentration classification detection according to preliminary formaldehyde concentration data detected by a formaldehyde detector. When a sensor preliminarily detects a fact that formaldehyde concentration is relatively low, specific formaldehyde concentration is identified by using a reagent method, a user is reminded of residual reserve level of a formaldehyde absorption reagent and the user is reminded to add a formaldehyde absorption reagent box; and when the sensor preliminarily detects a fact that the formaldehyde concentration is relatively high and toxicity can be produced to a human body, the formaldehyde concentration is further detected by using a gas chromatography method, the user is prompted to open an air purification channel as soon as possible, after a period of time, the formaldehyde concentration is detected by continuously using the gas chromatography method, and if the formaldehyde concentration after a period of time is continuously increased and reaches a concentration harmful to the human body, the user is prompted to be evacuated as soon as possible.

Description

technical field [0001] The invention belongs to the field of harmful gas detection equipment, and in particular relates to an intelligent formaldehyde detector. Background technique [0002] Formaldehyde is an odorless, pungent-smelling harmful substance. Formaldehyde is easily soluble in water and ethanol, and usually exists in the form of aqueous solution. Formaldehyde concentration below 0.10mg / m 3 It is colorless and odorless, relatively low in terms of human harm, and higher than 0.10mg / m 3 It has a pungent smell and will make people cry. Its concentration reaches 0.08-0.09mg / m in every cubic meter of air 3 When the child is mildly wheezing. When the indoor air reaches 0.1mg / m 3 When, there will be peculiar smell and sense of discomfort; reach 0.5mg / m 3 When, it can irritate the eyes and cause tearing; reach 0.6mg / m 3 , can cause throat discomfort or pain. When the concentration is higher, it can cause nausea and vomiting, cough, chest tightness, asthma and eve...

AI Technical Summary

Problems solved by technology

[0004] The application with the application number CN201710644209.5 discloses a formaldehyde rapid self-test box with high precision and its use method. It uses a liquid solvent that reacts with formaldehyde, and the product produced by the reaction of phenol reagent and formaldehyde can be detected under acidic conditions. The principle of ferric ion oxidation to form blue-green compounds is to use a colorimetric card to determine the concentration of formaldehyde. However, the formaldehyde self-test box is a one-time test product and cannot be used multiple times. The method of manual comparison of the reaction color is inaccurate. At the same time, the formaldehyde detection The temperature is not guaranteed, and the detection of formaldehyde concentration is not accurate

[0005] The application document with the application number CN201811421591.4 discloses a method for detecting free formaldehyde in a chemical plant. The spectrophotometer installed in the detector measures the oxidized color of the oxazine generated by the reaction between formaldehyde and phenol reagents to determine the free formaldehyde in the air. Formaldehyde; although it uses an electronic method to determine the color, the detection accuracy is high, but because it uses a reagent reaction method, it cannot be used multiple times and the temperature of formaldehyde detection is not guaranteed, and the concentration of formaldehyde is not accurate.

[0006] The current formaldehyde detectors on the market cannot intelligently distinguish the formaldehyde concentration for intelligent precision adjustment detection, and most of them use the reagent method to detect formaldehyde, and the number of times of use is limited. The use of formaldehyde sensors to detect formaldehyde is also an electrochemical detection method. Oxygen reacts with oxygen on the working electrode and the counter electrode and releases charges to form a current. The magnitude of the generated current is proportional to the concentration of formaldehyde and follows Faraday's law. The concentration of formaldehyde can be determined by testing the magnitude of the current, but When using a formaldehyde sensor to detect formaldehyde, due to the influence of humidity and coexisting interfering substances, accurate data cannot be obtained when measuring low-concentration formaldehyde, so it is urgent to improve the above aspects

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