Detector Tube Shelf Life

Detector tube shelf life is the manufacturer-defined period during which a detector tube remains accurate and functional when stored exactly as specified. After the printed expiry date, results may be unreliable and the tube should not be used unless the manufacturer explicitly allows otherwise. Typical shelf life is about two years, can last longer if refrigerated, and tubes must be kept in original packaging to avoid light-related degradation.

On a manufacturing or shop floor, detector tubes are used for spot checks and short-term exposure screening for gases and vapours. Expired tubes can give false low or false high readings that affect exposure decisions. WorkSafeBC guidance notes that tube readings near exposure limits should be interpreted cautiously, and short-term indicator tubes are not to be used to calculate 8-hour TWAs. Practical application includes checking the expiry date on the box before use, storing tubes cool, dark, and in original packaging, letting refrigerated tubes return to ambient temperature before sampling, and treating shelf life as a quality assurance limit reflecting accuracy under stated storage conditions.

• ⚠️Using expired tubes and treating the reading as valid; expired detector tubes are specifically described as potentially giving unreliable or false readings.
• ⚠️Poor storage practice such as leaving tubes in sunlight, outside their packaging, or in uncontrolled heat, which can degrade the reagent and shorten usable life.
• ⚠️Misusing the result by comparing a short-term tube reading to an 8-hour TWA limit or by making a non-compliance call from a marginal result without considering the tube’s stated accuracy and the need for follow-up sampling.