TECHNICAL DESCRIPTION flowIQ® 3100
40
Kamstrup A/S • Technical Description • 5512
-
1242_B1_GB • 05.2015
10.5
Signal
paths
10.5.1
Measuring sequences
During flow measuring the meter passes through a number of sequences, which are repea
ted at fixed
intervals. Deviations only occur when the meter is in test mode.
10.6
Flow limits
In the meter’s
working range from ‘min cutoff’ to saturation flow ‘max cutoff’, the flow through the meter
will be registered with an accuracy, which observes OIML R49 at any time. If the flow exceeds saturation
flow (‘max. cut
-
off’)
see
. table page
7, flowIQ® 3100 regi
sters a constant flow at max. cutoff.
If the value of the flow is lower than ‘min. cutoff’, flowIQ® 3100 does not register any flow.
In the meter’s working range from min. cut
-
off to max. cut
-
off there is a linear connection between the
quantity of wate
r which has passed through the meter and the measured water flow.
In practice the highest possible water flow through the meter will be limited by the pressure in the system
or cavitation due to too low downstream pressure.
According to OIML R49 the upper flow limit Q4 is the highest flow, at which the flow meter may operate for
short periods of time without exceeding maximum permissible error. flowIQ® 3100 has no functional
limitations during the period, when the meter operates above Q4. Please note, however, that high flow
velocities > Q4 involve the risk of cavitation, especially at low static pressures below 0.03 MPa (0.3 bar).
Q
3
: 4…16 m³/h
Triangle
The sound path covers the
measuring tube in a triangle.
Ultrasound signals are sent
from the transducers through
the measuring tube via
reflectors.