Chapter 4 Transducer installation
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inadequate transducer installation or incorrect parameter input.
Generally, "Delta Time" fluctuation should be less than ±20%. Only when the pipe
diameter is too small or velocity is too low can the fluctuation be wider.
4.2.4. Transit time ratio
Transit Time Ratio indicates if the transducer mounting spacing is accurate. The
normal transit time ratio should be 100+/-3 if the installation is proper. Check it in
Window M91.
4.2.5. Warnings
(1) Pipe parameters entered must be accurate; otherwise the flowmeter will not
work properly.
(2) During the installation, apply enough coupling compounds in order to stick the
transducers onto the pipe wall. While checking the signal strength and Q
value, move the transducers slowly around the mounting site until the
strongest signal and maximum Q value can be obtained. Make sure that the
larger the pipe diameter, the more the transducers should be moved.
(3) Check to be sure the mounting spacing is accordance with the display in
Window M25 and the transducer is mounted at the pipe’s centerline on the
same diameter.
(4) Pay special attention to those pipes that formed by steel rolls (pipe with
seams), since such pipe is always irregular. If the signal strength is always
displayed as 0.00, that means there is no signal detected. Thus, it is
necessary to check that the parameters (including all the pipe parameters)
have been entered accurately. Check to be sure the transducer mounting
Attention
If the transit time ratio is over 100±3,it is necessary to check:
(1) If the parameters(pipe outside diameter,wall thickness,pipe material,line, etc.) have been
entered correctly,
(2) If the transducer mounting spacing is accordance with the display in Windows M25,
(3) If the transducer is mounted at the pipe’s centerline on the same diameter,
(4) If the scale is too thick or the pipe mounting is distorted in shape, etc.
