IFX-F100
User Manual
9
Flow_Transmitter_IFX-F100_EN_2018_March_Rev.0
3.2
Clamp-on sensor installation
The correct selection of the sensor location is crucial for achieving reliable
measurements and a high accuracy. Measurement must take place on a pipe
in which sound can propagate (see Acoustic Propagation) and in which a
rotationally symmetrical flow profile is fully developed (see Straight Pipe
Lengths).
The correct positioning of the transducers is an essential condition for error-
free measurements. It guarantees that the sound signal will be received un-
der optimal conditions and evaluated correctly. Because of the variety of ap-
plications and the different factors influencing the measurement, there can
be no standard solution for the positioning of the transducers.
The correct position of the transducers will be influenced by the following
factors:
•
diameter, material, lining, wall thickness and general condition of
the pipe;
•
the medium flowing in the pipe;
•
and the presence of gas bubbles and solid particles in the me-
dium.
Check that the temperature at the selected location is within the operating
temperature range of the transducers (see technical specification in the Ap-
pendix).
After the sensor location, has been selected, make sure that that supplied
cable is long enough to reach the flow transmitter mounting location. Ensure
that the temperature at the selected location is within the ambient operating
temperature range of the flow transmitter (see Specification)
Acoustic propagation is given when the flowmeter is able to receive sufficient
signal from the transmitted ultrasonic pulses. The signals are attenuated in
the pipe material, the medium and at each of the interfaces and reflections.
External and internal pipe corrosion, solid particles and gas content in the
medium do heavily contribute to signal attenuation.
Sufficient straight lengths of pipe on the inlet and outlet of the measuring
location guarantee an axi-symmetrical flow profile in the pipe for good meas-
urement accuracy. If insufficient straight lengths of pipe are available for your
application measurements are still obtainable, but the certainty of the meas-
urement can be reduced.
Acoustic propagation
Straight pipe lengths