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Kamstrup A/S • 55122412_A1_GB_2019-03
MULTICAL® 803 & ULTRAFLOW®
6.2 Backup battery
MULTICAL® 803 comes with backup of calculator, temperature sensors and flow sensors so that
the basic meter function is maintained in the event of an interruption of the mains supply. It is,
however, possible to extend the backup functionality to include the communication module in
module slot 1. This is done by moving the connection of the backup battery to the connector under
the label with the text
MODULE 1
placed in the calculator top.
Note: Not all communication modules are suitable for backup operation. For example,
communication modules with pulse outputs and LON communications cannot be used with the
appropriate battery life. Read more about appropriate modules in the technical description of
MULTICAL® 803, document no. 5512 -2360.
Optimal battery lifetime is obtained by keeping the battery temperature below 30 °C, e.g. by
wall mounting. The voltage of a lithium battery is almost constant throughout the lifetime of the
battery (approx. 3.65 VDC). Therefore, it is not possible to determine the remaining capacity of the
battery by measuring the voltage. The battery cannot and must not be charged and must not be
short-circuited. Used batteries must be handed in for approved destruction, e.g. at Kamstrup A/S.
Further details appear from the document on handling and disposal of lithium batteries
(5510-408).
7 Testing of function
Carry out an operational check when the energy meter has been fully mounted. Open
thermoregulators and valves to enable water flow through the heating system. Activate the front
key of MULTICAL® to change display reading, and check that the displayed values for temperatures
and water flow are credible values.
