This section provides an overview for detector tubes as well as their applications and principles. Also, please take a look at the list of 9 detector tube manufacturers and their company rankings.
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A detector tube is a tool used to measure the concentration of a compound present in the gas being measured. They are used to measure the concentration of gases that are harmful to the human body, such as hydrogen sulfide, or highly flammable gases, such as hydrogen. Dedicated detector tube is sold for each gas, and it is not possible to measure different compounds.
There are two types of detector tube: one to measure the concentration of a gas over a certain period and the other to measure the average concentration over a longer period. The use of a detector tube is simple and easy, as anyone can simply use a piston to draw the gas.
Detector tubes are used frequently in manufacturing and construction sites because they are easy to operate. Detector tubes are also used for official testing, as they are often used in working environment measurement methods required by law. They can also be used to measure the concentration of flammable gases, thus preventing explosions and ignition.
Detector tubes are also used to measure the concentration of malodorous substances in the air, thus helping to prevent pollution near factories and manufacturing sites. In research, detector tubes are used to analyze reactions by measuring gases produced by chemical reactions.
The detector tubes are filled with the gas to be measured. The detector tubes are filled with a substance that reacts with the compound to be measured, and the concentration of the compound to be measured is determined based on the amount of the substance that reacted. The amount of the reacting substance in the tube is determined by the change in color of the substance. The quantitation and detection limits vary with each detector tube.
For areas where the oxygen concentration is too low, or where toxic gases are present, or where direct sampling of gases is not possible due to high risk, a remote sampling tube, which is several meters long, is used.
As mentioned above, detector tubes are used to determine the concentration of the compound to be measured by reacting with a filler. It is not possible to make measurements using different types of detector tubes. The filler in detector tubes degenerates over time, so it is essential to check the expiration date before using the tubes. When using detector tubes, it is recommended to measure gases at several points in the space to be measured, as the distribution of gases may be biased due to specific gravity or other factors.
The Kitagawa gas detector tubes consists of detector tubes and a gas sampler, and has been in use since 1947 as a hydrogen sulfide detector tubes for quality control.
In this detector tubes, the detector tubes are filled with a detector agent that reacts sensitively with the gas being measured, and when the sample gas is vented, the agent reacts with the specific gas and changes color. The gas concentration can be determined by reading the scale on the discolored tip of the detector tubes.
This detector allows the concentration of flammable gases to be measured quickly on site, thus preventing fires and explosions caused by leaking or evolved gases.
The detector tubes are first folded at both ends using a chip cutter or similar tool. The detector tubes are then inserted into the mounting port of the device, and the handle of the device is pulled. The detector tubes are then inserted into the instrument and the handle is pulled. The detector tubes are left in place for a certain period, then removed from the gas sampler and the discoloration boundary is read. The relationship between the concentration of the measured gas and the length of the discoloration is printed on the detector tubes as a concentration scale, which can be read to determine the concentration of the measured gas.
For ammonia gas, the measurement range is less than 30 ppm and the detection limit is about 0.2 ppm when the gas is aspirated once (100 ml). The presence of ammonia causes a neutralization reaction (2NH3 + H2SO4 → (NH4)2SO4) with sulfuric acid, which changes the indicator from pink to yellow.
For oxygen, the measurement range is in the 3-6% range with a detection limit of about 2% for a single aspiration (100 ml). When oxygen is present, the reaction with titanium trichloride (O2 + 4TiCl3 (black) + 6H2O → 4TiO2 (white) + 12HCl) produces titanium oxide, which causes the indicator to change from black to white.
Carbon dioxide has a measurement range of 100 to 2000 ppm with a detection limit of about 20 ppm for a single aspiration (100 ml). The presence of carbon dioxide causes a neutralization reaction (CO2 + 2KOH → K2CO3 + H2O) with potassium hydroxide, which changes the indicator from light red to orange.
*Including some distributors, etc.
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