How do Draeger tubes work?
When you snip the ends of the tube, put one end into a Draeger-Tube pump, and draw air through the Draeger tube, if the gas is present in the surrounding environment the tube will change colors measuring the concentration present.
Are colorimetric tubes accurate?
The American Industrial Hygiene Association (AIHA) in their manual, Direct-Reading Colorimetric Indicator Manual (Second Edition, 1993) makes the following statement on detector tube accuracy: The accuracy of detector tubes generally is considered to be +/-25% of the reading.
What are detector tubes?
Gastec Detector Tubes are used in environments where sampling, screening and TWA measurement is required. The glass tubes are filled with chemical reagent that absorbs and reacts with the target gas or vapour being measured.
How much can the accuracy of a detector tube device vary?
Tubes are not very accurate. At best, expect ± 20%. More generally, expect ± 25%. Tubes can be quite temperature sensitive, and although correction data is customarily provided by the manufacturer, in practice it is not frequently applied.
What is a stain tube?
RAE Systems colorimetric gas detection stain tubes, which are similar to Draeger tubes, enable quick measurement of a wide range of toxic and combustible gases and vapors. RAE gas detection tubes are easy to read, and provide a sharp, clear color change directly corresponding to the concentration of gas present.
Why do detector tubes have different ranges?
What range do the detector tubes measure at? For many gases and vapours, there are several concentration ranges available (ppm, %, Mg/m3, mg/l) giving you the flexibility to measure both low and high concentrations without sacrificing precision.
How long are Draeger tubes good for?
2 years
Draeger Tubes have a shelf life of 2 years. To see your Draeger tubes expiration date, check the box your tubes were shipped in, because the expiration dates are stamped on the sides of the boxes when they are shipping out. The Natural Gas Draeger Tube is the only exception to the two year shelf life rule.