The MD-490S Helium Leak Detector incorporates a zero feature that when initiated measures the current ambient helium back ground level in the testing area then stores this value and offsets the collector output so the display reads zero. This allows the unit to provide accurate quantified measurements for “go/no go” leak testing when using a specific reject set point. The LED located next to the ZERO soft key will blink once indicating the auto zero was active.
ESTABLISHED 1958.
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