If signal strength value Q displayed in M90 is less than 60 ,following methods are recommended to better off:

1) Relocate a better location.

2) Try to polish the outer surface of the pipe ,and use enough coupling compound to increase the signal strength.

3) Adjust the transducer positioning vertically and horizontally; make sure the transducers spacing is the same as M25 value.

4) when the pipe material is not suitable for ultrasonic signal transmission; our hot-topped insertion transducer recommended.