Ahlborn ALMEMO 204, Operating Instructions Manual, Page: 17 / 72

Power supply
7. POWER SUPPLY
Power can be supplied to the measuring instrument in any of the following
ways :
Three AA alkaline batteries (included in delivery)
Mains adapter, 12 V, 2 A, with ALMEMO
®
plug ZA1312-NA10
Power supply cable, electr. isolated 10 to 30 VDC, 0.25 A ZA2690-UK
USB data / power cable 9 V, 0.2 A ZA1919-DKU5
Our product spectrum covers all the appropriate accessories.
7.1 Battery operation and supply voltage monitoring
The device is normally powered by three AA alkaline batteries. At a current
consumption of on average 30 mA, these should last for an operating time of
approx. 100 hours. However, if the display illumination is left switched on, this
will be reduced to approx. 50 hours. Since this device operates exclusively
with active sensors, their current consumption must also be considered. The
current operating voltage can be checked in the
Info
menu; this gives you a
basis for estimating the remaining operating time. (s. 10) As soon as the re-
maining battery capacity drops to approx. 10 %, the battery symbol
´´µµµµµµµµµ¶
will
appear in the status bar or softkey bar of the display and start to flash. If the
batteries discharge completely, the device will switch off automatically as soon
as battery capacity drops to approx. 3 V; any parameters set will be saved. (s.
7.6) To replace used batteries first switch the device off and then unscrew the
cover of the battery compartment located on the rear of the device. (6) When
inserting fresh batteries ensure that their polarity is correct.
7.2 Mains operation
To power this device from an external source preferably use mains adapter
ZA-1312-NA10 (12 V / 2 A); connect this to the DC socket. (3) Please ensure
that the mains voltage is correct. The sensor voltage rises to approx. 12 V.
7.3 External DC voltage supply
The DC socket can also be used to connect another DC voltage, 6 to 13 V
(minimum 200 mA). (3) It can be connected using ALMEMO
®
plug ZA-1312-
FS8. If, however, the power supply has to be electrically isolated from the
transducers or if a larger input voltage range (10 to 30 V) is required, then elec-
trically isolated supply cable ZA-2690-UK must be used. It will then be possi-
ble to use the measuring instrument in a 12-volt or 24-volt on-board supply
system. A practical alternative is USB data / power cable ZA-1919-DKU5; this
provides simultaneously a data interface to the computer and power supply.
(not
electrically
isolated)
ALMEMO ® 204 17