Liquid leak detectors are suitable to detect leaks. It is easy to use and inexpensive. When squirted on fitting, a leak becomes visible by the continuous formation of bubbles in the liquid. It is recommended to be used for leakage detection of fittings which have temperature below 100C.
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Other Notes: For use with volumetric (bubble) flowmeters. Also useful for checking gas delivery system plumbing for leaks. Not recommend for use upstream of capillary GC systems (an electronic leak detector is preferred).