TECHNICAL DESCRIPTION
ULTRAFLOW
®
54 DN150-250
5512-876 GB/04-2012/Rev. F1
5
1
General description
ULTRAFLOW
®
54 DN150-250 is a static flow sensor based on the ultrasonic measuring principle. It is primarily
used as a volume flow sensor for energy meters such as MULTICAL
®
. ULTRAFLOW
®
54 DN150-250 has been
designed for use in heating and cooling installations where water is the heat-bearing medium.
ULTRAFLOW
®
54 DN150-250 employs ultrasonic measuring techniques and microprocessor technology. All
calculating and flow measuring circuits are collected on one single board, thus providing a compact and rational
design and, in addition, exceptionally high measuring accuracy and reliability is obtained.
The volume is measured using bidirectional ultrasonic technique based on the transit time method, with proven
long-term stability and accuracy. Four ultrasonic transducers are used to send sound signals both against and
with the flow. The ultrasonic signal travelling with the flow reaches the opposite transducer first. The time
difference between the two signals can be converted into flow velocity and thereby also volume.
A three-wire signal cable is used to connect ULTRAFLOW
®
54 DN150-250 to the Kamstrup MULTICAL
®
calculator.
The cable supplies the flow sensor and also transfers the signal from sensor to calculator. A signal corresponding
to the flow – or more correctly, a number of pulses proportional to the water volume flowing through – is
transmitted.
ULTRAFLOW
®
54 DN150-250 is available with internal supply, e.g. if the distance between MULTICAL
®
and
ULTRAFLOW
®
is 10 meters or more. If ULTRAFLOW
®
54 DN150-250 is used for other equipment (e.g. other brands
of calculators), the sensor must be fitted with a galvanically separated output module and a supply of its own.