MULTICAL® 803
Kamstrup A/S · Technical description · 5512-2360_A1_GB_02.2019
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General description
MULTICAL® 803 is a robust and all-round calculator, suitable as heat meter, cooling meter or bifunctional
heat/cooling meter together with 1 or 2 flow sensors and 1, 2, 3 or 4 temperature sensors. The calculator is intended
for energy measurement in almost all types of thermal installations where water is used as the energy-conveying
medium.
MULTICAL® 803 can, in addition to heat and cooling energy measurement in both open and closed systems, be used
for leakage monitoring, permanent performance monitoring, power, flow and temperature limiter with valve
control.
According to EN 1434 and MID, MULTICAL® 803 can be designated as a “calculator” with separate type approval and
verification. The MULTICAL® 803 calculator top can be separated from the connection base by means of a screw
driver HEX 4 (4 mm Allen key) when the installation seals have been broken. This provides free access to the
installation of flow sensor, temperature sensors, backup battery and communication modules. The calculator top is
sealed from factory. The calculator can only be disassembled on approved meter laboratories. If the factory seal is
broken, the factory guarantee no longer applies.
MULTICAL® 803 has 2 flow sensor inputs that can be used for both electronic and mechanical flow sensors. The pulse
value can be configured from 0.001 to 300 pulses/liter and the calculator can be configured for all nominal flow
sensor sizes from 0.6 to 15,000 m
3
/h. By default, the calculator is supplied with galvanically coupled flow sensor
inputs that fit ULTRAFLOW® and, for example, reed switches. In addition, a connection board with 2 galvanically
isolated flow sensor inputs can also be supplied.
MULTICAL® 803 has automatic conversion between Pt100 and Pt500 sensors. The calculator even detects the type of
the connected temperature sensor. However, all connected sensors must be of the same type. Accurately matched
Pt500 or Pt100 sensors measure the temperatures in inlet and outlet pipes according to EN 60 751 and EN 1434.
MULTICAL® 803 has 4 temperature sensor inputs that all have 4-wire connection allowing up to 100 m sensor cable.
Sensor inputs can, however, also be used with 2-wire connection, either by shortening the outer terminals in each 4-
wire connection or by inserting a common 2x8 jumper above the connection terminals 3-7-8-4.
The accumulated heat energy and/or cooling energy can be displayed in kWh, MWh, GJ or Gcal with 7 or 8 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 and, by default, MULTICAL® 803 has backlit display.
Other reading options are: accumulated water consumption, operating hour counter, error hour counter, current
temperature measurements, current flow and power readings. Furthermore, MULTICAL® 803 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® 803 can be mains-supplied either by 24 VAC or 230 VAC. A built-in battery backup also ensures that the
calculator continues the energy measurement for up to 6 years in case of a voltage failure. The backlight of the
display is always off during
backup, bu
t the display can be read in illuminated rooms. Furthermore, it is possible to
connect a battery backup to module slot M1 by which, for example, M-Bus or wM-Bus will continue to operate
during a voltage failure.
In addition to the energy meter’s own data, MULTICAL® 803 can display the accumulated consumptions of four extra
water meters, e.g. cold and hot water meters, which supply a pulse signal to MULTICAL® 803 via reed switch or
electronic output. The contact signals from the extra water meters are connected via the communication modules
M1 and M2.
On the back of the top cover, several multi connectors are located, which to some extent create the link between
calculator, connection base and communication modules. In addition, these multi connectors enable calibration and
adjustment. MULTICAL® 803 is available with up to 4 communication modules for Wireless M-Bus, M-Bus, RS232 and
many more. Most of the modules are available with either pulse inputs or pulse outputs for use in the module slots
M1 and M2.