请教一下是SITRANS P，DS III 系列的压力、流量、液位变送器中的
active pressure valve/active pressure pipe/active pressure transmitter 是什么意思。出现这些词汇的句子如下：
1、Wait until the vapor in the active pressure lines (4) and in the compensation vessels (13) has condensed.
2、Open the active pressure valve (3B) slightly until air-free condensate emerges,then close it.
3、In the transmitter below the active pressure transmitter open both blowout valves (7) one after the other, in the transmitter above the active pressuretransmitter open both vent valves (8) slightly until air-free liquid emerges.
在Milltronics 系列的超声波探头中，echo profile 指的是回波的什么呢？profile 具体是什么？是包络线么？那么下面的Pointer是什么？
Profile Pointer Distance
Profile Pointer Amplitude
Profile Pointer Time
谢谢 |
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