检漏与验收
氦检和压降法，差的不是精度，是五个数量级
客户最常问：你们怎么检漏，压降法行不行。行，但要看你要什么答案。压降法回答「有没有漏」，氦质谱回答「漏多少、漏在哪」。两者灵敏度差五个数量级，不是仪器贵不贵，是方法本身的上限。
检漏与验收
Helium leak testing and pressure-rise testing differ by five orders of magnitude
A common question is whether pressure-rise testing is acceptable. It answers whether a chamber leaks; helium mass spectrometry answers how much and where. The gap is five orders of magnitude — a limit of the method, not of the instrument price.
检漏与验收
Seven checks a vacuum chamber has to pass
A welded chamber is not a deliverable chamber. Seven checks are carried out, each signed off and filed, and the report is dispatched with the unit. Records remain available for customer audit.