IFX-P200
User Manual
9
Hand-held_Flow_Meter_IFX-P200_EN_2017_July_Rev.01
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 medium.
Check that the temperature at the selected location is within the operating
temperature range of the transducers (see technical specification in the Ap-
pendix).
Acoustic propagation is achieved when the flowmeter is able to receive suf-
ficient signal from the transmitted ultrasonic pulses. The signals are attenu-
ated in the pipe material, the medium and at each of the interfaces and re-
flections. External and internal pipe corrosion, solid particles and gas con-
tent 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 no sufficient straight lengths of pipe are available for
your application, measurements are still obtainable but the uncertainty of the
measurement can be compromised.
Acoustic propagation
Straight pipe lengths
