TECHNICAL DESCRIPTION flowIQ® 3100
46
Ka st up A/S • Te h i al Des iptio •
5512-1242_D
_GB •
09.2016
11.4
Calculation of flow volume
The measurement of the actual velocity of sound in water is also used to determine the temperature of the
water, as there is a correlation between these two values, at temperatures below approx. 30 °C
The flow is calculated, as mentioned above, by multiplying the flow rate and the cross-sectional area:
A
F
Q
This measurement and calculation is performed every four seconds in the meter; the calculation itself only
takes a few milliseconds. The measurement is therefore a 'snapshot' of the current flow.
This, like any type of digital sampling, integrates the measurements over time, leading to the calculation of
the final volume.
Flow [l/s]
Tid [sekunder]
Time [seconds)
Flow [l/sec.)
