Problems encountered during the experiment

2009-12-13View Original

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During the experiment, the vacuum was evaporated and the mercury pressure difference was used to measure the vacuum degree. However, the pressure difference of the mercury pressure gauge can far exceed 760mm. What is going on?

Reply #22009-12-15

The mercury differential pressure gauge is always 760mmHG at normal pressure. After vacuuming, the reality of the differential pressure gauge should be 760mm+vacuum degree. Am I right? ?

Reply #32009-12-15

Is there such a situation? Has the differential pressure gauge been calibrated?

Reply #42009-12-18

The vacuum gauge is not calibrated, so the mercury may have deteriorated due to age (the mercury gauge is older than mine). The vacuum degree displayed by the digital differential pressure gauge is less than 10kPa

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Problems encountered during the experiment

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