© PCE Instruments
32
Eng
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5.3
Sensors
Selection of sensor position
The first step before installation should be finding a suitable position to place the sensors. This is a
requirement for accurate measurement results. Some basic knowledge about the pipes / the
plumbing system is necessary.
The ideal location would be an infinitely long, straight pipe, whereas there must be no entrapped air
(air bubbles) in the liquid. The pipes can either run vertically or horizontally. To avoid inaccuracies
due to turbulence in the liquid, a straight flow-calming section before and behind the measuring point
should be considered. In general, the section in front of the measuring point should be at least 10 x
the pipe diameter and after the measuring point, it should be 5 x the pipe diameter.
The following chart shows examples of good positions:
Pipe routings and sensor position
Upstream
Downstream
L
up
x ø
L
dn
x ø
10D
5D
10D
5D
10D
5D
12D
5D
20D
5D
20D
5D
30D
5D
