18
7.
POWER SUPPLY
Power can be supplied to the instrument in any of the following ways :
3 AA NiMH batteries with integrated charge circuitry (supplied as standard).
3 AA alkaline batteries
Mains adapter 12 V, 1,5 A, with ALMEMO
®
connector ZA 1312-NAx
Electrically isolated power supply cable (10 to 30 VDC, 1 A) ZA 2690-UK2
USB data supply cable (5 V, 0.4 A) ZA 1919-DKU5
Our product line includes corresponding accessories.
7.1
Rechargeable battery operation voltage mon-
itoring
Power is supplied to the measuring instrument as standard by 3 NiMH batteries.
At a current consumption of approx. 17 mA the operating time will be approx.
110 hours. If the display illumination is left switched on, this operating time will
be reduced to approx. 20 to 50 hours (depending on brightness). To prolong the
operating time for the purposes of long-term recording the device can be left in
SLEEP mode. (see 11.2.5) The operating voltage can be checked in the
power
supply
menu; this gives you a basis for estimating the remaining operating time.
(see 11.7)
As soon as the remaining battery capacity drops to approx. 10%, the battery
symbol
´´µµµµµµµµµ¶
in the status bar of the display will start to flash. As and when this
happens you should connect mains adapter ZB 1112-NA7 (12 V / 1 A) and re-
charge the batteries; this will take around 3 hours; further delay may result in
critically low discharge and this may damage the batteries. (see 7.3)
The NiMH rechargeable batteries can in fact be recharged at any time and in
any charge status using the intelligent charge circuitry. The charging current
and charge status can be checked and monitored at any time in the
power sup-
ply
menu. If the batteries are completely discharged, the device will switch off
but measured data and the time-of-day will be saved. (see 7.7)
Rechargeable batteries have specially coded bare contacts (serial numbers up
to 1110...) so that the device will charge these only - and not normal batteries.
7.2
Battery operating mode
Instead of the rechargeable batteries you can use 3 AA alkaline batteries. Those
have higher capacity permitting operation over 160 hours. In order to replace the
batteries, the sensors must be disconnected and removed, the rubber protection (7)
must be pulled off, and the battery cover (8) on the rear of the device must be un-
screwed and lifted off in the direction indicated by the arrow.
