在超声波测距中，echo profile 这里的profile应该是什么？ Profile Pointer Time
Profile Pointer Distance
Profile Pointer Amplitude
Active Pressure valve/pipe/transmitter 指的是什么 active pressure
1、Wait until the vapor in the active pressure lines (4) and in the compensationvessels (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 blowoutvalves (7) one after the other, in the transmitter above the active pressuretransmitter open both vent valves (8) slightly until air-free liquid emerges.
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