TECHNICAL DESCRIPTION MULTICAL
®
401
5512-091 GB/02.2008/Rev. J1
7
1 General Description
MULTICAL
401 is a static heat meter based on the ultrasonic principle. The meter is intended for energy
measurement in all types of heating installations with water as heat-conveying medium.
According to EN 1434
MULTICAL
401 can be described as a "hybrid instrument" also called a "compact meter".
In practice this means, that flow part and calculation unit must not be separated.
If flow part and calculation unit have been separated and the seals thereby have been broken, the meter will no
longer be valid for billing purposes, and the factory guarantee will no longer apply.
MULTICAL
401 is based on ultrasonic measurement and microprocessor technique. All circuits for calculation
and flow measurement are gathered in a single-board construction providing a compact and rational design, and
at the same time supreme measuring quality and reliability are achieved.
The volume measurement is carried out by means of a bidirectional ultrasound technique according to the transit
time method which today is considered the most long-term stable and accurate measuring principle. Two
ultrasonic transducers send ultrasonic signals with and against the flow direction. The ultrasonic signal travelling
in the flow direction will reach the opposite transducer first, and the time difference between the two signals can
subsequently be converted into flow quantity and thereby also volume.
The temperatures in flow and return pipes are measured by accurately matched Pt500 or Pt100 sensors according
to EN 60751. MULTICAL
401 is delivered either with short direct sensors according to EN 1434-2 or with ø5.8
mm pocket sensors that fit Kamstrup’s stainless steel sensor pockets.
The accumulated thermal energy can be displayed in kWh, MWh or in GJ, all including seven significant digits and
measuring unit. The display is specially constructed with a view to long lifetime and high contrast in a wide
temperature range.
Other possible display indications are accumulated water consumption, operating hours, current temperature,
current flow and power measurements. Furthermore,
MULTICAL
401 can be configured to read out target data,
peak flow, peak power, information code, date and user-defined tariff.
MULTICAL
401 is supplied via an internal lithium battery with a lifetime of up to 12 years. Alternatively, the meter
can be mains supplied, either from 24 VAC or 230 VAC.
In addition to the heat meter’s own data, MULTICAL
401 indicates an accumulated consumption for two extra
water meters, e.g. cold-water and hot-water meters, that supplies a contact signal to MULTICAL
401 via a reed
switch. The contact signals from the extra water meters are connected via the communication modules.
Furthermore, a multi-poled plug is placed under the top cover that is used in connection with calibration and
adjustment during verification and partly in connection with communication modules. MULTICAL
401 can be
supplied with communication modules for radio, M-Bus and RS232.
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