Flow meter right measurement

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my question is about low frequency measurement with rising edges (Mode 2). Everything works fine and the values I'm getting for the water flow are correct. But I have a tiny-big problem. When there is no flow the value of the timer is the last one and stays like that. Meaning that when I really have 0 Hz it keeps show me the last updated value e.g 10 Hz. How can I make it understund that there is no flow?

Using Labjack U3

Thanks in advance

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