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The function of the cap is to keep the septum in place. The type of cap to be used depends on the bottle
used for sampling. Each of our bottles is specifically fitted with a matching cap and septum, so that spillage or leakage can be avoided. As a general rule it is advised to avoid using containers and septa
already in use by the customer, if these have not specifically been chosen for use with a sampling system.
When samples are stored for future reference a double cap can be used for complete sealing after the sample has been taken. An additional septum can then be used between the under and extra overcap. Note that under-caps are slightly different from standard caps; therefore over-caps cannot be used with standard caps. Under- and over-caps are supplied as a set.
When sampling, a sample is drawn from the process and taken into a sample container. For liquids, this container consists of a bottle with a threaded, open-top cap. Between the bottle and cap a self sealing diaphragm (septum) is placed. The septum is of such material that when pulled from the needles, it reseals
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