11 Troubleshooting
PIOX S72* 11.2 Measuring point selection
131
UMPIOX_S72xV1-9EN, 2022-05-15
11.2 Measuring point selection
• Make sure that the recommended min. distance to any disturbance is observed.
• Avoid measuring points with deposit formation in the pipe.
• Avoid measuring points in the vicinity of deformations and defects on the pipe as well as welds.
• Make sure the pipe surface at the selected measuring point is even.
• Measure the temperature at the measuring point and make sure that the transducers are suitable for this temperature.
• Make sure that the outer pipe diameter is within the measuring range of the transducers.
• When measuring on a horizontal pipe, the transducers have to be mounted laterally on the pipe.
• A vertical pipe always has to be filled at the measuring point and the fluid should flow upward.
• No gas bubbles should form (even bubble-free fluids can form gas bubbles when the fluid expands, e.g., upstream of
pumps and downstream of great cross-section enlargements).
11.3 Maximum acoustic contact
• see section 7.2
11.4 Application-specific problems
The measuring points of the physical quantities for analysis are outside the valid range
• Check the entered value, see section 10.2.4.
The entered pipe roughness is not appropriate
• Check the entered value. Check the entered value considering the pipe condition.
Measurements on pipes made of porous materials (e.g., concrete or cast iron) are only conditionally possible
• Contact FLEXIM.
The pipe lining may cause problems during the measurement if it is not firmly attached to the inner pipe wall or
consists of an acoustically absorbing material
• Try to measure on a section of the pipe free from lining.
Highly viscous fluids strongly attenuate the ultrasonic signal
• The measurement of fluids with a viscosity of > 1000 mm
2
/s is only conditionally possible.
Gas bubbles or solids present in high concentration in the fluid scatter and absorb the ultrasonic signal and thus
attenuate the measuring signal
• A measurement is impossible if the value is ≥ 10 %. If the proportion is high, but < 10 %, a measurement is only
conditionally possible.
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