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During operation, we found the signal from the ultrasonic flowmeter jump to zero rapidly and recovered soon time and again. The curve of this output single shape like sawtooth wave.
Firstly, we suspect that there is bubble in the pipe that caused the missing signal of the ultrasonic and caused the jump of the signal. But we have no evidence for that, because the pipe size is only 2", where there is enough flow and it have enough lengths of both upstream and downstream pipeline.
So we have two questions:
1) How to prove if there is bubble in the pipe without cutting the pipe?
2) If the bubble exists in the pipe, how to eliminate the effect of the bubble to the ultrasonic flowmeter?
Firstly, we suspect that there is bubble in the pipe that caused the missing signal of the ultrasonic and caused the jump of the signal. But we have no evidence for that, because the pipe size is only 2", where there is enough flow and it have enough lengths of both upstream and downstream pipeline.
So we have two questions:
1) How to prove if there is bubble in the pipe without cutting the pipe?
2) If the bubble exists in the pipe, how to eliminate the effect of the bubble to the ultrasonic flowmeter?