Ahlborn ALMEMO 204, Руководство по эксплуатации, Страница: 18 / 72

7. Power supply
7.4 Sensor supply
At the ter (plus) and - (minus) in the ALMEMO ® plug there is a sensor
supply voltage of 6 / 9 / 12 V (self-healing fuse, total current 500 mA); this is
set automatically depending on the minimum sensor supply. With a 12 V sup-
ply the sensor supply voltage will generally also increase to 12 V.
7.5 Switching ON / OFF, reinitialization
To switch the device ON press and release
ON PROG r
located in the middle of
the cursor block. (5) The measuring menu most recently selected always ap-
pears in the display first. To switch OFF press and hold down the same key(s)
ON PROG r
. After the device is switched off the real-time clock continues to run
and all saved values and settings are retained intact. (s. 7.6) If interference
(e.g. electrostatic, battery failure) causes the device to behave abnormally, it
can be reinitialized. To activate a reset press and hold down key
F1 r when
switching on. To return all device programming (including device designation,
user menus, process control, etc.) to the factory default settings press and hold
down key
F2 r when switching on. In so doing certain parameters will be lost or
returned to their defaults : Language: German, Illumination: OFF, Device ad-
dress: 00, Hysteresis: 10, Sampling rate: 10 mops.
Sensor programming in the ALMEMO
®
plugs will remain unaffected.
7.6 Data buffering
The sensor's programming is stored in the EEPROM on the sensor plug; the
device's calibration values and programmed parameters are stored in the EEP-
ROM on the instrument itself; in the event of failure both will be retained intact.
Date and time-of-day settings and the individual value memory are retained in-
tact if the device is just switched off or when the batteries are changed - so
long as the batteries have a voltage of approx. 2.7 V.
8. CONNECTING SENSORS / TRANSDUCERS
Only digital ALMEMO
®
sensors can be connected at input sockets M0 and M3
(1) on measuring instrument ALMEMO ® 204, i.e. only standard sensors with
DIGI, Freq, or Inp, and all new D6 and D7 sensors. All standard sensors with
an ALMEMO ® plug usually have the measuring range and units already pro-
grammed and can thus be connected to any input socket without further adjust-
ment. A mechanical coding system ensures that sensors and output modules
can only be connected to the correct sockets. All ALMEMO ® plugs incorporate
two snap-lock levers; these snap into position as soon as the plug is inserted
into the socket, thus preventing unintended disconnection if the cable is pulled
accidentally. To withdraw the plug both these levers must first be pressed in at
the sides.
18 ALMEMO ® 204