Kamstrup MULTICAL 402, Техническое описание, Страница: 6 / 113

MULTICAL® 402
6
Kamstrup A/S · Technical Description · 5512-742_M1_GB_01.2016
1 General description
MULTICAL
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According to EN 1434 MULTICAL
402 is a static heat meter, cooling meter or combined 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.
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If flow sensor and calculator have been separated and the seals, therefore, broken, the meter is no longer valid
for billing purposes. Furthermore, the factory guarantee no longer applies.
402 can be designated a "hybrid instrument" also called a compact meter.
In practice this means that flow sensor and calculator must not be separated.
MULTICAL
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The volume is measured using bidirectional ultrasonic technique based on the transit time method, proven a
long-term stable and accurate measuring principle. Two 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.
402 employs ultrasonic measuring techniques, ASIC 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.
Accurately matched Pt500 or Pt100 sensors measure the temperatures in forward and return pipes according to
EN 60751. MULTICAL
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402 is available with a set of Pt500 sensors, either short direct sensors according to EN
1434-2 or D 5.8 mm pocket sensors which fit Kamstrup’s stainless steel sensor pockets.
The accumulated heat energy and/or cooling energy can be displayed in kWh, MWh, GJ or in Gcal, all in the form
of seven significant digits and a measuring unit. The display has been specially designed to obtain long lifetime
and sharp contrast in a wide temperature range.
Other possible readings are: accumulated water consumption, operating hour counter, current temperature
measurements, current flow and power readings. Furthermore, MULTICAL
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MULTICAL
402 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.
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In addition to the energy meter’s own data MULTICAL
402 is powered by an internal D-cell lithium battery with a lifespan of up to 16 years or a 2xAA lithium
packet with a lifespan of up to 6 years. Alternatively, the meter can be mains supplied, either by 24 VAC or 230
VAC.
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402 can display the accumulated consumptions of two
extra water meters, e.g. cold and hot water meters, which supply a contact signal to MULTICAL
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A multiple plug placed beneath the seal is used in connection with calibration and adjustment during verification
as well as in connection with communication modules. MULTICAL
402 via reed-
switch or electronic output. The contact signals from the extra water meters are connected via the communication
modules.
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In designing MULTICAL
402 is available with communication modules
for Radio, M-Bus and RS232.
®
402 we have attached great importance to flexibility through programmable functions
and plug-in modules (see paragraph 11 and 14) in order to secure optimum use in a wide range of applications.
In addition, the construction makes it possible to update previously installed MULTICAL
®
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
402 via the PC-program
METERTOOL.
®
402. Furthermore, the
description is directed to laboratories performing tests and verification.