Why the displayed flow rate is much lower or much higher than the actual flow rate?

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The displayed flow rate is much lower or much higher than the actual flow rate in the pipe under normal working conditions. Why?
The entered offset value might be wrong. Enter ‘0’ offset in window M44.
(a) Incorrect transducer installation. Re-install the transducers carefully.
(b) The ‘Zero Point’ is wrong. Go to window M42 and redo the “Zero Point” setup. Make sure that the flow inside the pipe is standstill. No velocity is allowed during this setup process.