Ahlborn ALMEMO 2290-2/3, Operating Instructions Manual

Page: 15 / 44

4. CONNECTION OF THE TRANSDUCERS
Any ALMEMO
®
sensors can be connected to the ALMEMO
®
input sockets (2)
CH1 and CH2 of the measuring instrument. For connecting existing sensors it
is only necessary to connect a corresponding ALMEMO
®
connector.
4.1 Transducers
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.
4.2 Measuring Inputs and Additional Channels
The measuring instrument ALMEMO ® 2290-2 has 1 input socket (2), the
ALMEMO ® 2290-3 has 2 input sockets CH1 and CH2, and additionally a
differential channel CH3 (CH1-CH2). However, ALMEMO ® sensors can, if
required, provide up to 4 channels. The additional channels can be especially
used with humidity sensors with 4 measuring variables (temperature/
humidity/dew point/mixture ratio) or used for function channels. If required, a
sensor can also be programmed with several ranges or scalings or, depending
on the pin assignment, 2 or 3 sensors can be combined in one connector (e.g.
rH/Ntc, mV/V, mA/V etc.). The additional measuring channels of a connector
are located on the next higher level. The following channel occupancy is valid
for both measuring instruments.
1
1
2
4
2 5
7
3
8
10 4 11
chann. 1 chann. 1
chann. 2 chann. 2
chann. 3 chann. 3
chann. 4 chann. 4
CH1
CH1 CH2 CH3
OUT2 OUT1 OUT1
OUT2
2290-2 2290-3
3=1-2
6=4-5
ALMEMO

2290-2/3 15
Connection of the Transducers