6
Functional description
The DulcoFlow
®
flow meter measures the
volume flow of pulsing flows. The ultrasonic,
time of flight measurement method is used. For
the time of flight measurement, a sound signal
is alternately transmitted in and against the
direction of flow. The time difference is then a
measure of the mean flow velocity. Use of the
ultrasound measurement method automatically
compensates any temperature induced
changes in the medium. Operation without
moving parts guarantees a long service life and
wear-free operation.
The DulcoFlow
®
calculates the mass flow from
the volume flow and the density of the feed
chemical.
Additionally the DulcoFlow
®
can measure the
metering strokes of the metering pump and
hence replace a dosing monitor such as the
Flow Control. A metering pump, such as the
gamma or delta
®
, can use these signals as
acknowledgement pulses for its individual
strokes. If the acknowledge pulses are missing
or if the capacity exceeds the specified limit
values, the metering pump stops after an
adjustable number of missing pulses and goes
into fault mode - see metering pump operating
instructions.
The DulcoFlow
®
gives the flow reading, stroke
feedback, or error messages via the various
output types. It is also possible to regulate the
flow using a delta
®
with a control module.
Functional description
14