Gas Detector Tube Sampling in Cold Temps

Especially in Winter, you should know how to correct for cold temperatures!

Gas detection tubes are a simple and cost-effective way to detect the presence of various gases and vapors in the air. These tubes contain a chemical reagent that reacts with the target gas, producing a color change that can be easily read by the user. However, there are a number of issues that can arise when using gas detection tubes in cold weather, especially during the winter months.

One of the primary issues with using gas detection tubes in cold weather is that the chemical reactions inside the tubes may be slowed or inhibited by the low temperatures. This can result in inaccurate or delayed readings, which can be dangerous if the user is relying on the tubes to detect the presence of hazardous gases. In order to minimize this issue, it is important to follow the manufacturer’s recommendations for storing and using the tubes in cold weather, which may include warming them to room temperature before use.

When the cold temperatures affect the rate of reaction of chemicals, it can often affect the stain length enough to require a correction factor. Corrections for temperature will be listed in the instruction sheet usually in a table or graph (do not discard this from the tubes box!). It usually incorporates a simple multiplier for the reading. A temperature measurement of the sample air must be made to properly utilize this correction table. In cases where a sample is drawn from a pipe or duct with an extension hose and/or probe, it is the temperature at the detector tube that must be known. This may be quite different from the temperature at the pump if sampled at enough of a remote distance.

Example of correction factor table — correct to the nearest temperature of the sample air.

Another issue with using gas detection tubes in cold weather is that the tubes may become brittle and break more easily due to the low temperatures. This can be particularly problematic if the tubes are being used in an outdoor environment, where they may be subject to temperature fluctuations and harsh weather conditions. To prevent this issue, it is important to handle the tubes carefully and to store them in a warm, dry place when not in use.

Finally, gas detection tubes may also be less effective at detecting certain gases in cold weather due to changes in the air flow and humidity. For example, gases that are heavier than air, such as carbon monoxide, may not be as readily detected in cold, dry air as they would be in warmer, more humid conditions.

Overall, while gas detection tubes are a useful tool for detecting the presence of various gases, it is important to be aware of the potential issues that can arise when using them in cold weather. By following the manufacturer’s recommendations and taking appropriate precautions, it is possible to minimize these issues and ensure accurate and reliable gas detection in any weather condition.