Reset Value to 0

Hello LabVIEW users..

I'm measuring flow using a flowmeter sensor and NI 6212. The flowmeter I use is a digital sensor type with a hall effect concept as shown in the attached picture. Everything is ok when the measurement is done, but when there is no flow through the sensor my indicator on the front panel shows the last number when measuring (latching), how do I reset the value to 0, if there is no flow through the sensor?

The code that I made is like the attached image.

I really respect for ur reply..