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A few matters easy to be ignored in UFM operation(1)

Ignore requirement on ultrasonic flow meter application conditions and environment.
Any velocity flow meter has certain requirements on the fluid flow fields within the measured pipeline; ultrasonic flow meter is no exception. When its front and/or back installation point cannot be guaranteed with enough straight length, measurement error caused by the instable flow cannot be ignored.

Transit-time ultrasonic flow meter is especially sensitive to the air bubbles mixed in liquid and display result will be instable if there are air bubbles in the liquid .Ultrasonic flow meters will not work if the accumulated gas is exactly in same position with the installed transducers. So ultrasonic flow meter installation should avoid water pump,  pipeline highest point or other places easy to be affected by gas. Transducers installation should also avoid pipeline top side and bottom side , but try to install transducers within scope between 45°angle and the level .We should also pay attention to pipeline defects such as welding lines and avoid these defects in installation.

Ultrasonic flow meter installation and application environment should avoid strong electromagnetic interference and vibration. In real applications, we found that the measurement result will be more or less affected if working place is below high-tension cable, beside the road full of cars, or when people use mobile phone or intercom near the flow meter main frame.