0 zero-point measurement – KROHNE UFM 800 EN User Manual

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Installation and operating instructions UFM 800 W / UFM 800 C

9.0

Zero-point measurement

For ultrasonic flowmeters it is important to have a good zero-point. For making a zero-point it is very important to have a situation where the flow
is absolutely zero. If that is not possible the default zero-point can be used, which is a good approximation.

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Have the fluid flow at a high flow rate for at least five minutes. Stop the flow and shut down the upstream and downstream valves (if available).

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Let the fluid stabilize until the displayed flow rate becomes stable. (At least a few minutes, but even longer for large diameters (> DN 300).

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Make a zero-point measurement (Fct. 3.1.4.) and check if the display comes to zero. Else repeat the zero-point measurement until a stable
zero-point is obtained.

Now the UFM 800W ultrasonic flowmeter should be operating in correct way.