MULTICAL® 403
Kamstrup A/S · Technical description · FILE100000166_B_EN-55121689_M1_07.2023
1 General description
MULTICAL® 403 is a static heat meter, cooling meter or bifunctional heat/cooling meter based on the ultrasonic
principle. The meter is intended for energy measurement in almost all types of thermal installations where water is
used as the energy-conveying medium.
According to EN 1434 MULTICAL® 403 can be designated a "hybrid instrument", also called a compact meter. In
practice this means that flow sensor and calculator must not be separated.
If flow sensor and calculator have been separated and the seals are broken, the meter is no longer valid for billing
purposes, and the factory guarantee no longer applies.
MULTICAL® 403 employs ultrasonic measuring technique, ASIC and microprocessor technology. A single-board
construction comprises all calculating and flow measuring circuits. This makes the design compact and rational, and,
in addition, exceptionally high measuring accuracy and reliability is obtained.
Volume is measured using bidirectional ultrasonic technique based on the transit time method, proven 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. The time
difference between the two signals can be converted into flow velocity and thereby also volume.
Accurately matched Pt500 sensors measure inlet and outlet temperatures according to EN 60 751. MULTICAL® 403
normally comes with a Pt500 sensor set, e.g. direct short sensors according to EN 1434-2, but also ø5,0 mm, ø5,2
mm, ø5.8 mm and ø6.0 mm pocket sensors are available. Kamstrup sensor pockets are available for all sizes of
pocket sensors, and all sizes can be mounted as direct sensors in the flow sensor, except ø5,8 mm and ø6,0 mm.
Accumulated heat energy and/or cooling energy can be displayed in kWh, MWh or GJ with seven or eight significant
digits plus measuring unit. The display has been specially designed with a view to obtaining long lifetime and sharp
contrast in a wide temperature range.
Other reading options are: accumulated water consumption, operating hour counter, error hour counter, current
temperature measurements, current flow and power readings. Furthermore, MULTICAL® 403 can be configured to
display monthly and yearly loggings, target date data, max/min flow, max/min power, information code, current date
as well as user-defined tariffing.
MULTICAL® 403 is powered by an internal D-cell lithium battery with a lifespan up to 16 years or a 2 x A-cell lithium
packet with a lifespan up to 9 years. If the meter has an NB-IoT module, the voltage supply can be a C-cell lithium
battery with a life of up to 12 years. Alternatively, the meter can be mains supplied, either by 24 VAC, 230 VAC or 24
VAC/VDC.
In addition to the energy meter’s own data, MULTICAL® 403 can display the accumulated consumptions of up to two
extra meters, e.g. an electricity meter or cold and hot water meters, which supply a pulse signal to MULTICAL® 403
via reed-switch or electronic output. The contact signals from the extra meters are connected via the communication
modules.
A multiple plug placed behind the seal of the top cover is used in connection with calibration and adjustment during
verification as well as in connection with communication modules. MULTICAL® 403 is available with communication
modules. See paragraphs 11 for details. The modules are available with either pulse inputs or pulse outputs.
In designing MULTICAL® 403 we have attached great importance to flexibility through programmable functions and
plug-in modules (see paragraphs 3.2 and 11) in order to secure optimum use in a wide range of applications. In
addition, the construction makes it possible to update previously installed MULTICAL® 403 via the PC-program
METERTOOL HCW.
This technical description has been written with a view to enabling operations managers, meter installers, consulting
engineers and distributors to utilize all functions comprised in MULTICAL® 403. Furthermore, the description is
targeted at laboratories performing tests and verification.
The technical description is currently updated. Find the latest edition at
https://www.kamstrup.com/en-en/heat-solutions/meters-devices/meters/multical-403/documents
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