4Timeratiobetweenthemeasuredtotal Transit Timeand The Calculatedtime - Omega FDT-25 User Manual

FDT-25 Handheld Ultrasonic Flowmeter 15
The total transit time should remain stable or vary little.
If the delta time fluctuates higher than 20%, it means there are certain kinds of problems with
the transducer installation.
§2.9.4 Time Ratio between the Measured Total Transit Time and the Calculated Time
This ratio would be used to check the transducer installation. If the pipe parameters are entered
correctly and the transducers are installed properly, the value for this ratio should be in the range
of 1003. If this range is exceeded, the user should check:
(1) If the pipe parameters are correctly entered.
(2) If the actual spacing of the transducers is right and the same as what the window M25 shows.
(3) If the transducers are installed properly in the right directions.
(4) If the mounting location is good and if the pipe has changed shape or if there is too much
fouling inside the pipes
(5) Other poor conditions.