User Manual

pH 1970i Battery / mains operation
19
ba75675e01 01/2007
Warning
Only connect electrodes to the measuring instrument that do not return any
unallowed voltages or currents (> SELV and > current circuit with current
limiting).
Almost all electrodes - in particular WTW electrodes - fulfill these conditions.
Battery / mains operation
The plug-in power supply supplies the measuring instrument with low voltage
(12 V DC). At the same time, the rechargeable battery is charged (approx. 16
hours). The LoBat display indicator appears when the rechargeable battery
is nearly empty.
Warning
The line voltage at the operating site must lie within the input voltage range
of the original plug-in power supply (see T
ECHNICAL DATA).
Warning
Only use original plug-in power supplies (see T
ECHNICAL DATA).
2
1
3
z Connect the plug (1) to the socket (2) of the measuring instrument.
z Connect the original WTW plug-in power supply (3) to an easily
accessible mains socket.