Power Supply; Battery Operation And Supply Voltage Monitoring; Mains Operation; External Dc Voltage Supply - Ahlborn ALMEMO 2590-2 Operating Instructions Manual

6. Power supply

6. POWER SUPPLY
Power can be supplied to the measuring instrument in any of the following
ways : 3 AA alkaline batteries (included in delivery)
Mains adapter 12V, 0.2A with ALMEMO
Electrically isolated power supply cable (10 to 30 VDC, 0.25 A)
Our product spectrum includes all the appropriate accessories.

6.1 Battery operation and supply voltage monitoring

Power is supplied to the measuring instrument as delivered by 3 AA batteries.
At a current consumption of approx. 20 mA the operating time will be approx.
150 hours. If the illumination is constantly switched on, this operating period is
reduced to approx. 75 hours. To prolong the operating time for the purposes of
long-term recording the device can be left in SLEEP mode; (see 11.5.8.2). The
operating voltage can be checked in the Info menu (see 9); this gives you a
basis for estimating the remaining operating time. As soon as the remaining
battery capacity drops to approx. 10% the
display will start to flash. If the batteries are completely discharged, the device
will switch off at 3.1 V but measured data already acquired and the time-of-day
will be retained; (see 6.6). To replace old batteries first unscrew the battery
compartment cover (7) on the rear of the device.

6.2 Mains operation

To power the device from an external source preferably use the mains adapter
(ZA 1312-NA1) (12V/0.2A); connect this to the DC socket (3). Please ensure
that the mains voltage is correct. The sensor voltage rises to approx. 12 V.

6.3 External DC voltage supply

The DC socket (3) can also be used to connect another DC voltage, 6 to 13 V
(minimum 200 mA). This is connected via an ALMEMO
FS). If, however, the power supply has to be electrically isolated from the trans-
ducers or if a larger input voltage range (10 to 30 V) is required, then electrical-
ly isolated supply cable ZA 2690-UK must be used. It will then be possible to
use the measuring instrument in a 12-volt or 24-volt on-board supply system.

6.4 Sensor supply

At the terminals + (plus) and - (minus) in the ALMEMO
sor supply voltage is available (self-healing fuse, total current 500 mA). In the
case of an external supply the voltage rises to approx. the applied voltage. Oth-
er voltages (12, 15, or 24 V or references for a potentiometer and strain gauge)
can also be obtained using special connectors; (see Manual 4.2.5 and 4.2.6).
14 ALMEMO ® 2590
connector
®
´´µµµµµµµµµ¶
symbol in the status bar of the
connector (ZA1012-
®
connector a 9-volt sen-
®
ZA 1312-NA1
ZA 2690-UK