4. CONNECTING THE TRANSDUCERS
Virtually any ALMEMO
®
sensor can be connected to any of the ALMEMO
®
input
sockets M0 to M2 (2). To connect your own existing sensors you simply need
the appropriate ALMEMO
®
connector.
4.1 Transducers
The ALMEMO
®
Manual includes detailed descriptions of the comprehensive
range of ALMEMO
®
sensors (see Manual, Chapter 3) and of how to connect
your own existing sensors to ALMEMO
®
instruments (see Manual, Chapter 4).
All standard sensors with an ALMEMO
®
connector usually have the measuring
range and units already programmed and can thus be connected to any input
socket without further adjustment. A mechanical coding system ensures that
sensors and output modules can only be connected to the correct sockets.
Each ALMEMO
®
connector also incorporates two snap-lock levers; these snap
into position as soon as the connector is inserted into the socket, thus preven-
ting unintended disconnection if the cable is accidentally pulled. To withdraw
the connector, both these levers must be pressed in at the sides.
4.2 Measuring inputs and additional channels
Measuring instrument ALMEMO 2390-5 has three input sockets M0, M1, M2 (2)
to which initially measuring channels M0, M1, M2 are allocated. 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 va-
riables (temperature / humidity / dew point / mixture ratio) or for function chan-
nels. Each sensor can if necessary be programmed with several measuring
ranges or scaling settings; and two or three sensors, if pin assignment so per-
mits, can be combined in a single connector (e.g. rH / Ntc, mV / V, mA / V,
etc.).
Measuring point numbering
Each additional measuring channel in a connector lies one level higher. In this
new series the levels are now numbered in standard decimal form, i.e. the front
digit indicates the level. The measuring point number (and thus also the pro-
grammed reference channels) for all devices with 1, 2, 3, 5, or 10 inputs thus
always remains the same. This means, however, that, with effect from measu-
ring channel number 20, the measured value resolution in the display is limited.
If this proves to be a serious problem, it is possible, by holding down the MANU
key when switching ON, to change to continuous sequencing (and, by means of
the same key, to change back again).
Device-internal channels
A further innovation on this device is its four extra additional channels. The first
of these is programmed by default as differential measuring channel M1 - M0.
This only happens, however, if there are two sensors with the same units and
ALMEMO
2390-5
15
Connecting the transducer
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