Flexim FLUXUS F60 Series - Page 16

3 General principles
3.1 Measurement principle FLUXUS F60*
2017-10-16, UMFLUXUSF60xV5-0EN
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Fig. 3.2: Sound path of the signal against the flow direction
c – sound speed
1 – transducer (emitter)
2 – transducer (receiver)
3 – pipe wall
Fig. 3.3: Transit time difference ∆t
1 – signal in the flow direction
2 – signal against the flow direction
c
β
flow direction of
the fluid
sound path with flow
sound path without
flow
β
α
γ
c
γ
distance increase
within the transducer
3
12
c
α
c
α
1 2
∆t