Is the electronic formaldehyde tester on the market accurate now?

There are generally two kinds of electronic formaldehyde testers on the market.

1) Portable detector, his principle is to use the sensor chip to sense the pollutants in the air, so it is greatly affected by the airflow, not accurate enough, and can only simply find out the source of pollution.

2) The all-in-one tester is now used more in the environmental protection industry, and it is more accurate and intuitive than the convenient one. However, there are several data that are still inaccurate, similar: formaldehyde, benzene, TVOC and other substances need to be analyzed by raw materials to produce data, and cannot be directly detected by testers.

Formaldehyde detection has national standards that can be followed, the detection principle is actually very simple, the most commonly used in the laboratory is also particularly suitable for measuring indoor formaldehyde is the phenol reagent method, the conditional will use chromatography, the instrument is more expensive than the cost of detection.

In 2019, CCTV also reported that most of the detectors on the market are inaccurate or have a large error, and even the detection of many exceeding the standard is not exceeded, formaldehyde is still very harmful, life is only once, how important and happy health is, and how sympathetic it is to see so many water drops.

I will share what I have learned with you, I hope it will be helpful to you, and you can make a discernment.

First, the electrochemical method of direct reading of the instrument, can achieve real-time reading, but many of the low-end sensors used are affected by the environment and are easy to fail or be affected by decoration and other odors (non-formaldehyde) interference is not accurate (to say that there is still a lot of room for progress in domestic sensors), so that the detection results and the actual deviation is large, dozens of hundreds of such instrument sensors are not formaldehyde sensors at all, known as "air anemometer", this kind of instrument does not have tens of thousands of dollars of don't want to measure indoor formaldehyde, No matter how much indoor formaldehyde exceeds the standard, it is relatively small, and the sensitivity of this type of detector is particularly high; In addition, if you still want to use this instrument to measure TVOC and benzene, it is redundant and does not have much reference value, these two must be measured accurately by large laboratory instruments, and the testing process is particularly complicated, which is why these two types of testing are very expensive;

The second is the formaldehyde kit, the detection principle is based on the national standard method phenol reagent chromogenic method, and the detection is relatively reliable in the first category (except for those in tens of thousands may be better), but the national standard law stipulates that 10 liters of air need to be collected quantitatively using a sampler, and the self-test box only stipulates: stand for 30 minutes.

How much of the volume of air reacts with the absorbent in these 30 minutes? This point is unpredictable, it may be that the indoor air circulation velocity is high and absorbs more, and the Brownian motion absorbs more quickly, on the contrary, the detection is not scientific, the randomness is too high, and it is best not to use it;

The third is a new generation: ask the pigeon convenient pump suction air formaldehyde detector, why it is convenient, because the professional testing company is also using the pump type, compared with the traditional structure is more complex and professional, ordinary consumers will not operate, and the convenient pump type on the market, optimized structure, easy to operate, although the process is the same, but it is indeed a lot simpler, completely according to the national standard detection method, the configuration of the pump sampler, the user can collect a fixed volume of 10 liters of air by himself, and then according to the national standard method phenol reagent chromogenic method detection, It makes up for the shortcomings of the formaldehyde kit.

If it helps you, give me a thumbs up!

Formaldehyde detectors are generally accurate。The formaldehyde detection instrument adopts the principle of high-sensitivity electrochemical sensor, combined with single-chip microcomputer technology and network communication technology to collect air samples from the detection site, and the formaldehyde in the air is absorbed by the phenol reagent solution, and the reaction generates azine, which is oxidized by the chromogenic agent iron iron ions in the acidic solution to form blue-green compounds.

Direct colorimetric determination in the field according to the color shade. Because the detection value of indoor pollution has a great relationship with the temperature, humidity, air pressure, etc. of the detection environment, according to the normal detection, the detected value will often deviate from the expectation. Formaldehyde detection refers to the quantitative detection of formaldehyde contained in air, water, food, clothing, plates, leather, etc. through specific methods or instruments.

Features of formaldehyde detector

It is not affected by extreme high temperature and humidity environment, and has a humidity compensation function. Formaldehyde readings are displayed in ppm or mg m units. One-button operation for fast sampling and fast recovery time.

The standard configuration includes a formaldehyde correction source (valid for six months) and the calibration procedure can be completed in a matter of seconds. Supplied with 10 phenol filters to exclude the influence of phenol on readings.

Optional computer remote control software and adapter make the formaldehyde detector a wireless monitoring system. Users can also choose to use a basic data processing device to print data in real time. Formaldehyde detection reagent, used together with air detection instruments, can detect the concentration value of various gases in more than 10 minutes.

After the decoration of the new house, you can not move in immediately, you need to test the indoor formaldehyde concentration, to see that the room is higher than the normal standard, and the formaldehyde concentration is commonly used to detect the formaldehyde detector. So is the formaldehyde detector useful, and how to make the formaldehyde detection more accurate, do you understand? Now let's take a look.

1. Is the formaldehyde detector useful?

Formaldehyde detector is useful. However, when using, it is necessary to pay attention to: Prepare purified water or distilled water ionized water; The bubble receiving bottle should not be close to the air inlet to prevent sucking; The utensils used need to be cleaned with tap water and pickling water before use; After the test is completed, clean up the colored liquid in time and clean it with tap water and pickling water.

2. How to make formaldehyde detection more accurate.

1. Choose a formaldehyde detector with high accuracy, which is best to go to a regular store to buy, not only the first time, but also the quality is more guaranteed, to avoid inaccurate detection data, bring greater trouble to yourself.

2. Before testing, try to eliminate indoor interference sources as much as possible. Adhesives, thinners, perfumes, wines, etc., which are left after opening, need to be removed from the outside as long as they are unsealed, so as not to affect the test results and lead to inaccurate measurements.

3. In the case of good weather, it is necessary to open the windows and carry out thorough ventilation to ensure that there will be no temporary pollution sources, generally speaking, the ventilation time can not be less than half an hour. Then when it comes to detecting indoor formaldehyde, it will be much more accurate.

4. Seal the room for at least 1 day. If the indoor temperature is below 19 degrees, the indoor air quality is poor, and the closure time needs to be delayed to 2 days. Finally, the sampling point is detected, and the height of the instrument is about 1m above the wall.

About whether the formaldehyde detector is useful, and how to make the formaldehyde detection more accurate, it is introduced here, do you understand? Formaldehyde detector is very useful, but in order to reduce the error, special attention needs to be paid to it.

1. If you are testing at home, there is no need to buy a professional formaldehyde detector, because the cost is too high, it is recommended to ask a professional CMA testing agency for testing. Or you can rent a CMA-certified formaldehyde detector and operate it yourself, which is generally operated**, and it is not so difficult to get started.

2. The above two methods are the most reliable, professional CMA testing institutions test a point is about 200 yuan, 100 square meters need 4 testing points, about 600-800 yuan, instrument rental, relatively cost-effective, whole house testing is about 200-300 yuan. You can choose according to your own situation.

Extended Materials. 1. Formaldehyde detector is an instrument for detecting formaldehyde. It realizes the rapid semi-quantification of formaldehyde in indoor air on site, with simple structure, small size, easy to carry and use, and intuitive.

It can be widely used for on-site quantitative and qualitative detection of formaldehyde in the air in living rooms, indoors, residential areas, public places, living places and factories and mines.

2. The formaldehyde detection instrument adopts the principle of high-sensitivity electrochemical sensor, combined with single-chip microcomputer technology and network communication technology to collect air samples from the detection site, and the formaldehyde in the air is absorbed by the phenol reagent solution, and the reaction generates azine, which is oxidized by the chromogenic agent iron iron ion in the acidic solution to form a blue-green compound.

3. According to the color shade, it is directly measured in the field. Because the detection value of indoor pollution has a great relationship with the temperature, humidity, air pressure, etc. of the detection environment, according to the normal detection, the detected value will often deviate from the expectation.

Note 1The test water must be distilled, deionized, or purified. 2.

The bubble absorption bottle should not be connected to the air inlet hole, otherwise it will cause back-sucking, damage the instrument, and lose the absorption solution. 3.All glassware should be cleaned with pickling solution, tap water, and distilled water in the chemical laboratory before being used for the first time.

4.After each test, the colored solution in the bottle should be absorbed by bubbles in time, and then cleaned with pickling solution, tap water, and distilled water.

Forbid. Now there are those that specialize in removing formaldehyde, and I think they are accurate. I bought it online before, and the test was not accurate at all, and it smelled very big, but it couldn't be measured.

In addition to formaldehyde, there is another important aspect before the formal construction, that is, the formaldehyde content detected in the closed state of the indoor space, and the corresponding measures are taken according to the corresponding value of indoor harmful gases, which is a correct and targeted, and strong formaldehyde removal process. Today, professional formaldehyde removal companies will tell you whether the values detected by the so-called formaldehyde testing products are accurate.

One: Formaldehyde detection products are not allowed to sell very well.

Second: the formaldehyde detector does not meet the testing standards at all.

Three: The reason for the good sales is that it is relatively cheap.

There are dozens of dollars of household formaldehyde detectors, or even less than 10 yuan of formaldehyde self-inspection boxes, some merchants clearly say that the detection is not allowed to return, some merchants proudly say that their products quote imported testing technology, and some businesses say that the detector can detect a variety of harmful substances. The product itself and the promotional content of the business can not be communicated, only a few dozen dollars of things, the function is actually richer than the laboratory equipment, ** is so low, if such a testing instrument can play a role, you have to bother to do what professional equipment? ? , trying to launch a so-called formaldehyde detection product, so that consumers are happy to give money to the unknown, and merchants are making a lot of money.

In the age of the internet, all kinds of products are in front of us, and according to the practice that single episodes are fools, smart people will know how to tell the difference.

If you have smelly feet, put it next to a portable detector, formaldehyde and TVOC can seriously exceed the standard, you can buy a try,

The results of the formaldehyde detector bought online are inaccurate, and the test results are greatly affected by factors such as temperature, humidity and air velocity, which can easily lead to large errors. We can: 1. Buy testing instruments by yourself 2. Please test with a special testing agency 3. Please test with a testing agency.

If formaldehyde is detected to exceed the standard, you can also use activated carbon, photophyllin, etc. for treatment

1.Formaldehyde can be removed by using plants to extract photophyll materials, which can be broken down by adsorbing formaldehyde and chemically reacting with it.

2.Physical methods such as activated carbon can adsorb formaldehyde, and placing a few packs of activated carbon can adsorb formaldehyde. After exposure, it can be reused.

3.Using an air purifier in a room is also a quick and effective method, but the ** of a good air purifier is relatively high. Hope it helps.

Among the risk monitoring products of relevant departments, the formaldehyde detector displays its so-called "report issued by an authoritative testing agency" on the product webpage. In order to gain the trust of consumers, sellers even zoom in on relevant data figures to emphasize the accurate effect of product value.

Is the test report of the formaldehyde detector provided by the seller reliable?

In fact, is this report true?

**This report is from the Shanghai Institute of Metrology and Testing Technology.

But at this point, the Shanghai Institute of Metrology and Testing Technology said after the search: the reported data is problematic, and it has been considered to be deliberately falsified, tampering with the core data of the test report, and the seller is suspected of false publicity.

It is understood that the portable formaldehyde detector manufacturer is suspected of exaggeration or false publicity, and the performance parameters are far from the manufacturer's propaganda parameters, which is an objective situation.

However, many manufacturers do not regard other test reports as professional third-party test reports, which is a kind of consumer fraud.

Embarrassingly, it is difficult for consumers to tell whether a report is real or false and has been tampered with.

Therefore, the quality inspection report of the rapid formaldehyde detector sold online is questionable.

For the detection of our living, working environment, and indoor air (including formaldehyde), it is recommended to find a professional formaldehyde testing institution, after all, health problems cannot be ignored.

The formaldehyde detectors bought online are all electronic sensors, with poor anti-interference performance, and the data varies greatly. The national testing standard is phenolic reagent sampling.