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Description
3.3 Theory of Operation
FUP1010 IP67 Portable
20
Operating Instructions, 03/2012, A5E02951522-02
Flow Calibration Factor
Normally, the flow stream is in line with the axis of the pipe. On this basis, the calibration
factor of a clamp-on ultrasonic flow meter is proportional to the cosine of the beam angle
relative to the pipe axis. However, this reveals that if the angle of flow stream is not in line
with the pipe axis, the flow calibration factor could be compromised. This most often occurs
when the sensor mounting location is within close proximity of a bend or other pipe
obstruction. It is recommended that, whenever possible, mount sensors on the longest
available straight run of pipe and also use Reflect Mode mounting (as shown below).
①
Upstream Sensor
②
Downstream Sensor
③
Flow Direction
④
WideBeam transmissions exchanged between the Upstream and Downstream sensors
Reflect mounting automatically corrects for non-axial flow or cross flow conditions. When the
exchange of sonic signals occurs by reflection off the far pipe wall as shown above, the
average beam versus stream angle will be equivalent to that of an axial flow stream.
Summary of Contents for 7ME3510
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Page 185: ...1012TP S 8 OUTLINE DIMENSIONS REFLECT MODE DIRECT MODE 1012TP S SERIES 21614 C MOUNTING TRACK ...
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Page 195: ...DUAL HEAD CONFIGURATION 21614 C IN LINE CONFIGURATION FLOW ...
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