Ahlborn ALMEMO 3290-8 V5, Operating Instructions Manual

Page: 14 / 48

The device can be switched off by operating the push button once again. The
red control lamp will no longer be illuminated. However, the real time clock
continues operating and, due to the buffering rechargeable battery, all stored
values remain available (see 3.5).
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 completely reinitialised.
The
reset can be achieved if the key
Clr
is pressed during switch-on. All
internal data such as max, min and average values, and the data memory will
be cleared. 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 Buffer
For an uninterrupted power supply of the real time clock and the memory a
NiCd rechargeable battery (2.4V) for buffering is installed, which ensures that
time and date data and all stored values are maintained for several months if
the mains supply is not available. However, to prevent the rechargeable battery
from completely discharging and to avoid the loss of data, the instrument be
operated with mains supply for a few hours should at least once per month.
4. CONNECTION OF THE TRANSDUCERS
Any ALMEMO ® sensors can be connected to the ALMEMO ® input sockets M0
to M8 of the measuring instrument (5). For connecting existing sensors it is
only necessary to connect a corresponding ALMEMO
® connector.
4.1 Transducer
s
A detailed description of the comprehensive ALMEMO ® sensor range (see
manual section 3) and the connection of existing sensors (see manual section
4) to the ALMEMO
® instruments are provided in the ALMEMO ® manual. All
standard sensors with ALMEMO ® connector usually have the measuring range
and dimension already programmed and can be immediately connected to any
input socket. A mechanical coding ensures that sensor and output modules
can only be connected to the correct sockets. Furthermore, each ALMEMO
®
connector has two locking levers that snap in when the insertion into the socket
is established and that prevent a disconnection caused by pulling the cable.
Both levers must be pressed on the sides for disconnecting the connector.
14 ALMEMO

3290-8
Connection of the Transducers