Power Supply; Mains Unit; Taking Into Operation - HYDROMETER EW7731 Série Instructions D'installation

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4. POWER SUPPLY

4.1 Battery
A 3.6 V DC lithium battery is fitted in the standard version. The
battery is not to be charged or short-circuited. Ambient tempe-
ratures below 40 °C extend the life of the battery. Used batteries
must be disposed of at suitable waste collection points. Caution
risk of explosion if battery is replaced by an incorrect type.

4.2 Mains unit

24 V AC or 230 V AC mains units (Protection Class 1) can be
changed or retrofitted at any time. The protective safety co-
ver must be installed at all times. Never connect between two
phases, as this would destroy the mains unit. The cable is to be
fused at max. 6 A and protected against manipulation.
The mains unit notifies the meter if mains voltage is present. If
the mains fails, the backup battery (CR2032) in the mains unit
provides the power supply for up to 1 year. The LCD readings (on
pressing button) and the date and time are still updated, but none
of the measuring functions work, incl. the flow rate measure-
ment. Communication still functions over the optional M-Bus,
RS485 and RS232 modules or the optical interface, but reduces
the life of the backup battery. The radio function is switched off in
the event of mains failure.

5. TAKING INTO OPERATION

Once the meter has been installed, the components (integrator,
volume measuring component and both temperature sensors)
must be sealed and the meter taken into operation. Check the
display for a plausible indication of flow rate and temperatures.
Further information can be obtained from the Installation and
User Guide.