Gastec tubes for use with the precision pumps to accurately detect and measure over 500 gases and vapours. This page just shows a small selection of the tubes available, so please contact us to ask if you can't see a suitable tube here.
Gastec detector tubes are used worldwide in manufacturing plants, refineries, chemical plants, dry cleaners and all workplaces where gas detection for employee safety is required.
The simple to use system requires only a Gastec pump along with the appropriate tube for the gas or vapour you need to detect.
The colorimetric glass tubes are filled with an absorbent material, usually silica gel impregnated with a chemical reagent. When air is drawn through the tube by the Gastec pump the reagents react in the presence of the target gas to give a colour change. The length of this colour change on the tube is proportional to the concentration of the gas present - the calibration scale is printed on the tube for immediate readout by the user.
When reading the colour change off the gastec tube, when the colour change is flat read the value at the end of the colour changing, e.g. in the example below the reading would be 5
When the colour change is slanted read the value in the middle - in the examples below the reading would be 5
When the end of the colour change is pale or fades out gradually read the value in the middle - in the example below the reading would be 5