Formaldehyde detector adopts the principle of high-sensitivity electrochemical sensor, combined with single-chip technology and network communication technology to collect air samples at the testing site. The formaldehyde in the air is absorbed by the phenol reagent solution and reacts to generate oxazine. The chromine is exposed to the chromogenic agent ferric ion in acidic solution. Oxidation forms a blue-green compound. According to the color depth, the colorimetric measurement is directly performed in the field. Formaldehyde detector can be widely used in indoor, indoor, residential areas, public places, places of life and factories in the air of formaldehyde in the field of quantitative qualitative testing.
The common testers on the market are broadly classified into the following categories:
1. The use of probes for testing, on behalf of the instrument has XP-308, 4160, PPM400, etc., characterized by direct reading of the data, easy to carry, the disadvantage is the greater impact of temperature and humidity, need to use standard gas calibration, daily maintenance costs are low, the probe Usually one year replacement, and the price needs a few thousand dollars.
2. Using spectrophotometry to perform analytical readings, there are Japanese RIKEN FP-30, domestic JI size swan, the former using finished tablets, the instrument is small and compact, the sample is read directly after 15 to 30 minutes, the accuracy can reach 0.005PPM, the cost of maintenance is The price of the tablets is about RMB 17/piece, and the machine does not need maintenance at all. The relative operation of the cygnets is relatively complicated. The steps required for sampling after 15 minutes are cumbersome and the precision can be made 0.01. The features of these instruments also highlight the accuracy and accuracy, and have little interference with the influence of gas, and the temperature and humidity are compensated.
3. The handheld formaldehyde detector is a handheld instrument that can measure formaldehyde continuously. This product is suitable for environmental monitoring, industrial production, chemical and other places with formaldehyde.
4, portable formaldehyde detector can be adjusted at the scene to zero, without resorting to outdoor air. It is applied to indoor formaldehyde gas detection in public places, indoor formaldehyde gas detection in civil buildings, and formaldehyde content detection in building materials.
Precautions:
1. The test water must be distilled water deionized water or pure water.
2. The bubble absorbs the bottle and must not be connected to the air intake hole, otherwise it will suck backwards, damage the instrument and lose the absorbing liquid.
3. Before all glassware is used for the first time, it must be cleaned with the acid solution in the chemical laboratory, tap water, and distilled water.
4. After the end of each test, the colored solution in the bubble absorption bottle should be promptly removed, and then the acid solution, tap water, and distilled water should be used for cleaning.
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