Model UFM Compact Ultrasonic Flowmeter is a low cost clamp-on, ultrasonic
flowmeter. The Model UFM implements the transit-time difference to measure flow rates
in pipes non-invasively. It is a compact and lightweight design, featuring an easily installed,
all in one clamp-on unit. This unit can measure velocity and flow in pipes with outside
diameters ranging from 0.98 to 4.62" (24.89 to 117.35 mm). The screen offers easy to read
text with a convenient backlight for visual comfort. This model comes with a volume pulse
and 4 to 20 mA flow rate output.
PRINCIPLES OF OPERATION
Two sensors located in the guiderail are placed on the exterior of the pipe, and each
transmits an ultrasonic pulse through the pipe and fluid to the other. The velocity of
the liquid flowing through the pipes causes the pulse to accelerate or decelerate.
The difference in the transit times of the two pulses is used to calculate the flow rate.
The use of transit time allows the flowmeter to be unaffected by pressure or