3.3 External DC Voltage Supply
It is also possible to connect another DC voltage, 12V ±5% (800mA), to the
socket
DC
(5). The connection is performed by using a low voltage connector
(NES1 according to DIN 42323), center pin to minus. However, the electrically
isolated supply cable ZB 2590-UK must be used if an electrical isolation
between power supply and transducers is required or if a larger input voltage
range 10...30V is required. It allows to operate the measuring instrument with
12V or 24V on-board supply systems.
3.4 Switch On/Off, Reinitialisation
The slide switch (1) on the left side must be used to switch the device on or off.
up:
ON
down:
OFF
After switch-off the real time clock continues its operation and all stored data
remains available by a buffer battery (see 3.5). If the device was operating in a
measurement menu before switch-off it will return to the corresponding menu
after switch-on, otherwise the main menu will be displayed.
If the device shows an irregular behaviour due to interference influences (e.g.
electrostatic charging or discharged buffering battery) or if incorrect
programming must be avoided, the device can be reinitialised. The
reset
can
be achieved if the key F1 is pressed during switch-on. All internal data such as
maximum and minimum values and the data memory will be cleared and the
user menus will be set to the delivery defaults. Furthermore, cycles, time, date
and device address are set to zero and the conversion rate and atmospheric
pressure will be set to the standard values. However, the device configuration
and the sensor programming within the ALMEMO
®
connectors will not be
affected by the reset.
3.5 Data Buffering
The sensor programming is stored in the EEPROM of the sensor connector,
the calibration of the instrument is fail-safe stored in the EEPROM of the
instrument. The instrument, measuring data, as well as the time and date are
buffered by the lithium battery so that storage of the data is also guaranteed
when the device is switched off or when the batteries are discharged.
ALMEMO
®
2590-9
13
Connection of the Transducers
