The Alcatel ASM 10 Portable Helium Leak Detector has the following:
Features:
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High sensitivity (8x10-12 )
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LN2 trapped diffusion pump
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3.2 CFM vane rough pump
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Rugged
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Eeasy to use and calibrate
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Full protection against atmospheric air-in rushes
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Throttle valve allows unit to be used on large volumes.