Time Ratio Between The Measured Total Transit Time And The Calculated Time - PCE Instruments TDS-100H Manual

TDS-100H Handhold Ultrasonic Flowmeter Ver.8.08
respectively. They are the primitive data for the instrument to calculate the flow rate inside the
pipe. So the flow rate indication will vary accordingly with the total time and delta time.
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 100±3. 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.
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