Switching ON / OFF, reinitialization
the device to behave abnormally, the device can be reinitialized. To activate
RESET
press and hold down the key
CLR
r
when switching on. This will restore
all settings - except the device designation - to the factory default status. Only
the programming of the sensors in the ALMEMO
®
connectors remains unaf-
fected.
7.6 Data buffering
The sensor's programming is stored in the EEPROM on the sensor connector
and the device's calibration and programmed parameters are stored in the
EEPROM on the instrument itself, both on a fail-safe basis. Date and time-of-
day are retained intact if the device is just switched off but are lost when the
batteries are replaced.
8. CONNECTING THE TRANSDUCERS
Only certain ALMEMO
®
sensors can be connected to ALMEMO
®
input socket
M0 (1), namely those programmed with measuring ranges as per Ch 10.1.2.
Attempting to connect any other sensor here will trigger an error message. To
connect your own existing sensors you simply need the appropriate
ALMEMO
®
connector.
8.1 Transducers
The ALMEMO
®
Manual includes detailed descriptions of the ALMEMO
®
range
of sensors (see Manual Ch 3) and instructions for connecting your own existing
sensors to ALMEMO
®
instruments (see Manual Ch 4). All suitable sensors with
an ALMEMO
®
connector (see above) have the measuring range and units al-
ready programmed and can thus be connected to the input socket without fur-
ther adjustment. A mechanical coding system ensures that sensors and output
modules can only be connected to the correct sockets. All ALMEMO
®
connec-
tors incorporate two snap-lock levers; these snap into position as soon as the
connector is inserted into the socket, thus preventing unintended disconnection
if the cable is accidentally pulled. To withdraw the connector, both these levers
must be pressed in at the sides.
For the ALMEMO
®
2450-1 version with the optional seal new specially de-
signed sensors are available with spray-coated ALMEMO
®
connectors incorpo-
rating a double sealing lip to protect the socket unit against the effects of
splashing water. For any unused sockets protective stoppers are available.
8.2 Measuring inputs and additional channels
The ALMEMO 2450-1 measuring instrument has one input socket (1) to which
initially measuring channel M0 is assigned. ALMEMO
®
sensors can, however,
if necessary, provide up to four channels. The additional channels can be used
in particular for humidity sensors with four measuring variables (temperature /
humidity / dew point / mixture ratio) or for function channels. Each sensor can if
ALMEMO
®
2450-1
15
