UFM2/UBT User Manual
Issue 1.1b July 20 Page 37
downstream side, as shown in Figure 3, but this may vary. Flow Measurements can be made on
shorter lengths of straight pipe, but when the transducers are mounted this close to any obstruction
the resulting errors can be unpredictable.
Figure 22 Location of unit
To obtain the most accurate results, the condition of both the liquid and the pipe must be suitable to
allow ultrasound transmission along the predetermined path.
In many applications, an even flow velocity profile over a full 360° is unattainable due, for example,
to the presence of air turbulence at the top of the flow and also possibly sludge at the bottom of the
pipe. Experience has shown that the most consistently accurate results are achieved when the
sensors are mounted at 45°with respect to the top of the pipe. In chiller applications, the meter’s
sensor/electronics must be mounted at 45°with respect to the top of the pipe to prevent
condensation entering the electronics unit.
IMPORTANT: DO NOT EXPECT TO OBTAIN ACCURATE RESULTS IF THE UNIT IS
POSITIONED CLOSE TO ANY OBSTRUCTION THAT DISTORTS THE UNIFORMITY OF
THE FLOW PROFILE. DWYER INSTRUMENTS, INC. ACCEPTS NO RESPONSIBILITY
OR LIABILITY IF PRODUCT HAS NOT BEEN INSTALLED IN ACCORDANCE WITH
THESE INSTRUCTIONS.
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