 The
Digital Correlation Transit Time flowmeter is designed
to utilize the latest surface mount technology. The
flowmeter is built on a digital frame work which
allows for the storage and transmission of encoded
frequency patterns. When correlated together, such
patterns offer a high signal to noise ratio, thus
increasing the flowmeter's performance. Once on site,
diagnostic tools allow the user to determine the
optimum operating condition for the flowmeter to
ensure continued trouble-free operation. |
Time measurement is used to derive the velocity of the
liquid flow. 
This is carried out by two time measurements - one
coarse and one fine. The coarse measurement is made by
digitally storing the transmitted and received
waveforms and passing them through one another. The
fine measurement is applied to the phase shift of the
encoded transmission frequency.
|
The correlation produces a recognizable pre-determined
pattern. The result is optimum tolerance to suspended
particles and aeration within the flowing liquid. |
