Methods The vacuum negative pressure meter and the delayed control line were used.
2
在离心式水泵工作现场只须把原安装真空表的位置换上负压变送器即可进行检测。
On the working spot of centrifugal water pump, the detection can be carried out only by fixing the negative pressure translator in the original position of vacuum meter.
3
气象及实验室等领域进行表压或绝压得测量，也可测负压，真空度等。
Meteorological and laboratory areas, such as gauge or weight measurement must also test negative pressure, vacuum and so on.
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