Meter Installation And Application; Basic Rules - Elis SONOELIS SE404X Design, Assembly And Service Manual

Design, Assembly and Service Manual
Page 13 of 44
Ultrasonic flow meter SONOELIS SE404X,
SONOELIS SE406X
ELIS PLZEŇ a. s.

5. METER INSTALLATION AND APPLICATION; BASIC RULES

When using an ultrasonic flow meter in a piping containing a particular fluid, certain conditions need be met to
ensure correct measurements. The limiting operational parameters of the fluid (i.e. temperature, pressure and
flow velocity) as well as the mechanical design and properties of the meter sensor (flow stabilisation piping
sections before and after sensor, complete flooding of the sensor cavity at all times, elimination of cavitation
effects and fluid foaming) must comply with the requirement for steady fluid flow with no gas bubbles or foam
appearing in the piping. Such conditions are different for various types of fluid and need be correctly identified for
each specific measuring spot and/or technological piping system.
CAUTION: Ultrasonic flow meter of a specific DN must not be used in piping of lesser sizes (smaller DN).
The ultrasonic flow meter shall be applied/installed in observance of certain rules concerning meter placement in
the fluid piping so as to ensure that the measurement accuracy complies with the meter specifications. Thus
sensor UC 3.0 requires flow-stabilisation straight sections of piping of the length of 5D (D = sensor ID) at the
input and 3D at the output where such arrangement effectively eliminates any flow disturbances due to 90° pipe
bends, changes in the piping diameter or similar simple flow-interference factors. With sensor UC 5.0, the same
flow stabilisation arrangement ensures a wider range of measured values at the specified measurement
accuracy (see section 4.1).
Required straight piping sections to stabilise the fluid flow through the sensor
If there is a pump located in the piping on the input side of the flow sensor, the required length of the stabilisation
piping is 20 D. If there is a valve or similar flow control element at the sensor input, the required stabilisation
length is 40 D. If such control element is fully open, the stabilisation length is 10 D.
Straight piping sections to stabilise the fluid flow after a "disturbance" in the piping
If any fluid-flow control element is located in the piping on the sensor output side, the sufficient length of the flow
stabilisation piping is 3 D.
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