ULTRAFLOW® 54/34
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Kamstrup A/S · Technical description · 5512-2464_A1_GB_08.2019
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General description
ULTRAFLOW® is a static flow sensor. It is used as a volume flow rate sensor primarily for energy meters such as
MULTICAL®. ULTRAFLOW® 54 has been designed for use in heating installations where water is the heat-bearing medium,
whereas ULTRAFLOW® 34 has been designed for use in cooling and heat/cooling installations where water is the energy-
bearing medium.
Flow measuring in ULTRAFLOW® is based on ultrasonic measuring and microprocessor technique. A single-board
construction comprises all calculating and flow measuring circuits, which provides a compact and rational design and, in
addition, exceptionally high measuring accuracy and reliability are obtained. The volume is measured using bidirectional
ultrasonic technique based on the transit time method, which has proven to be a long-term stable and accurate
measuring principle. Through two ultrasonic transducers, the sound signal is sent both with and against the flow. The
ultrasonic signal travelling with the flow reaches the opposite transducer first, and the time difference between the two
signals can be converted into average flow velocity and thereby to volume flow rate and volume.
A three-wire signal cable is used to connect ULTRAFLOW® to the calculator. The cable transfers the signal to the calculator
and also supplies the flow sensor. The transmitted signal corresponds to the flow and consists of a number of pulses,
which is proportional to the quantity of water having passed through the sensor (volume).
When ULTRAFLOW® is used as a volume flow rate sensor for MULTICAL®, ULTRAFLOW® is supplied by MULTICAL®.
ULTRAFLOW® can be connected directly with MULTICAL® by a cable length of up to 10 m. When there is a need to extend
the cable between ULTRAFLOW® and MULTICAL®, a Cable Extender Box can be used, which is mounted between
ULTRAFLOW® and MULTICAL® to extend the cable up to 30 m. Note that ULTRAFLOW® and MULTICAL® in these cases
are not galvanically separated.
If you would like to use another calculator than MULTICAL®, the connection between ULTRAFLOW® and the calculator
must normally be carried out through a Pulse Transmitter. If ULTRAFLOW® is connected to a another calculator with a
different meter factor than the one supplied by ULTRAFLOW®, a Pulse Divider is used instead. Pulse Transmitter and Pulse
Divider are available with built-in supply for ULTRAFLOW®.
In addition, Pulse Transmitter and Pulse Divider use a cable length of up to 100 m between ULTRAFLOW® and MULTICAL®,
which is required in some installations. The pulse outputs of both Pulse Transmitter and Pulse Divider are galvanically
separated.