Rechargeable Battery Operation And Supply Voltage Monitoring; Battery Operation; Mains Operation - Ahlborn ALMEMO 2470-1S Operating Instruction

Power supply cable, electrically isolated (10 to 30 VDC, 0.25 A) ZA 2690-UK
12 VDC via clamp connector at DC socket ZA 1000-FSV
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7.1 Rechargeable battery operation and supply voltage monitoring

Power is supplied to measuring instruments 2470-2/2S as standard by 3 AA re-
chargeable NiMH batteries. With the display always lit and at current consump-
tion of approx. 30 mA a battery set should last for approx. 65 hours. Without
display illumination (this can be switched off temporarily, see 12.4) only half the
above current is needed and thus double the operating time can be attained. To
prolong the operating time for the purposes of long-term recording the device
can be left in SLEEP mode. (see 11.2.4) The operating voltage is displayed each
time the device is switched on and the status bar shows a battery symbol indic-
ating the battery's approximate charge status.
estimating the remaining operating time. As and when the remaining battery ca-
pacity drops to approximately 10 percent, the last section in the battery symbol
is displayed in red. Now - or at the very latest when the battery symbol is empty
and starts to flash - the user should connect mains adapter ZB 1112-NA7 (12 V /
1 A) and recharge the batteries; this will take around 4 hours; any further delay
may result in critically low discharge and this may damage the batteries. (see
7.3) The rechargeable NiMH batteries can in fact be recharged at any time and
in any charge status, using the intelligent charge circuitry. If the rechargeable
batteries are completely discharged the device itself will switch off.

7.2 Battery operation

The ALMEMO ® 2470-1 is normally powered by 3 AA alkaline batteries. The
2470-2/2S can also be powered in this way instead of using rechargeable bat-
teries. Standard non-rechargeable batteries have a higher capacity permitting
operation of over 100 hours and (without display illumination) of up to maxim-
um 200 hours. In order to replace used batteries, disconnect and remove the
sensors, pull off the rubber protection, and open the battery compartment on
the rear of the device by undoing the screw and lifting off the battery cover in
the direction indicated by the arrow. When inserting new batteries ensure that
their polarity is correct. For long-term data logging 1.5 V AA lithium batteries
(e.g. Energizer Lithium) are even more suitable because self-discharge is very
low.

7.3 Mains operation

To power these devices from an external source preferably use mains adapter
ZA 1312-NA7 (12 V / 1 A); connect this to the DC socket (3). Please ensure
that the mains voltage is correct. With the ALMEMO
mains adapter also charges the rechargeable batteries. As soon as it is con-
nected the device switches on automatically. The battery symbol in the status
Power supply
This gives the user a basis for
® 2470-2/2S devices this
ALMEMO ® 2470 15