© PCE Instruments
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Spacing between the sensors
The distance betw een the upstream and the dow nstream sensor can be seen in w indow M25. The
w indow states the inner distance betw een the tw o sensors which you should stick to as accurately as
possible. The information in M25, how ever, must only be considered a coarse adjustment. The fine
adjustment is carried out by arranging the spacing in a w ay that the time constant in M90 is exactly
100%.
To ensure accurate measurement values, the follow ing data must be entered:
(1) Outer diameter of the pipe (M11)
(2) Material thickness of the pipe (M12)
(3) Material of the pipe (M14)
(4) Liner of the pipe (M16)
(5) Type of liquid (M20)
(6) Type of sensors connected (M23)
(7) Mounting method of sensors (M24)
(8) Check the spacing in w indow M25 and fix the sensors accordingly.
Selection of the measurement method
V m ethod
The V method is the most commonly used method for everyday use. It is ideal for inner pipe diameters
of 20 to 300 mm. It is also called reflective method.
Top view of pipe
1
Upstream transducer
2
Spacing
3
Dow nstream transducer
4
Flow direction
(9)
!!! During installation, m ake sure that the value of the time constant in M90 is 100 %,
that the signal strength is >700 and that the signal quality is >60.
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