Gas Detector Tubes Detection System

What is a colorimetric gas detector tube

It is a closed tube made of glass that contains a chemical substance to monitor and react (with a color change) in the presence of the target gas or vapor. Gratuations, usually in ppm (parts per million) or %/vol (percentage of volume), offer very accurate measurements with relative immunity to interfering substances.

Application area of ​​gas detector tubes

Due to the large number of gases in the atmosphere or formed as a result of chemical reactions, it is not possible to detect all of them with a gas detector.

Having a surprising range of gases (hundreds) colorimetric gas detector tube It can be a particularly suitable and relevant solution in many cases. As well as being as easy to use as an alcohol analyzer, they are also affordable – a few dozen euros for a pack of 10 tubes.

Different categories of gas detector tubes:

There are two categories of gas detector tubes: colorimetric tubes and dosimeter tubes (also known as dosi tubes). Colorimetric plates also exist, but they are much less common and more complex to use.

  • Colorimetric tubes:

These units are by far the best known and most used due to the large number of toxic or asphyxiating gases they can monitor. To date, approximately 500 references are available for use in various fields of activity. Colorimetric gas detector tubes are instant measurement systems and must be used with a sampling pump. Gastec reagent tubes use special pumps to precisely sample a specific volume of gas. Colorimetric reagent tube is one-time gas concentrations where the result can be obtained within seconds. Dräger colorimetric reagent tubes are renowned for their efficiency and instant measurement.

  • Dosimetric tubes:

This is a TWA (Time Weighted Average) measurement system that measures gas concentration over a fixed period of time (e.g. 8 hours represents a working day). There is no need for a pump for this type of gas detector tubes, the gas concentration is read directly in the tube after exposure. This is an ideal and cost-effective solution for measuring gas exposure in working environments: exhaust gases, formaldehyde, paint shops…