1: General Description
U3000/U4000 User Manual 3
(Issue 2.0)
transmitted against it. The difference in time taken by the sound to travel the same distance but in opposite
directions is therefore directly proportional to the flow velocity of the liquid.
The U3000/U4000 system employs two ultrasonic transducers attached to the pipe carrying the liquid and
compares the time taken to transmit an ultrasound signal in each direction. If the sound characteristics of the
fluid are known, the instrument’s microprocessor can use the results of the transit time calculations to
compute the fluid flow velocity. Once the flow velocity is known the volumetric flow can be easily calculated
for a given pipe diameter.
The system can be set up to operate in one of four modes determined mainly by the pipe diameter and the
type of transducer set in use. The diagram in Figure 1.1
illustrates the importance of applying the correct
separation distance between the transducers to obtain the strongest, and therefore most reliable, signal.
1.3 Supplied Hardware
The supplied U3000/U4000 components are shown in Figure 1.2.
Figure 1.2 Standard U3000/U4000 equipment
U3000/U4000Standard equipment
• Instrument with backlit graphic display.
• Transducer cables (x2) 5 metres long.
• Transducers ‘A-ST’ x2 (U3000/U4000A) for use with pipes ranging 13mm – 115mm.
• Transducers ‘B-ST’ x2 (U3000/U4000B) for use with pipes ranging 50mm – 2000mm.
• USB cable and RS232-C cable (U4000).
• Guide rail for use with ‘A’ or ‘B’ transducers.
• Steel bands used to secure the transducer guide rails to the pipe.
• Acoustic couplant.
• User documentation.
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