Connecting The Sensors / Transducers; Sensors / Transducers; Measuring Inputs And Additional Channels - Ahlborn ALMEMO 2590-2A Operating Instructions Manual

CONNECTING THE SENSORS / TRANS-
8.
DUCERS
An die Any ALMEMO ® sensor can be connected to any of the input sockets M0
to M1/M2/M3 (1) (depending on device type) on the ALMEMO ® measuring in-
strument. To connect your own existing sensors you simply need the appropriate
ALMEMO ® connector.

Sensors / transducers

8.1
The ALMEMO ® Manual includes detailed descriptions of the comprehensive
ALMEMO ® range of sensors (see Manual Ch 3) and instructions for connecting
your own existing sensors to ALMEMO ® instruments (see Manual Ch 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. All
ALMEMO ® connectors incorporate two snap-lock levers; these snap into posi-
tion as soon as the connector is inserted into the socket, thus preventing unin-
tended disconnection if the cable is accidentally pulled. To withdraw the con-
nector, both these levers must be pressed in at the sides.
Splash-proof variants of devices in the ALMEMO ® 2590A series are also avail-
able as options. For this purpose a number of new sensors are now available
with spray-coated ALMEMO ® connectors incorporating a double sealing lip spe-
cially designed to protect the socket unit against the effects of penetration by
splashing water. For any unused sockets protective stoppers are available.

Measuring inputs and additional channels

8.2
The ALMEMO ® 2590-2A/4A measuring instruments incorporate respectively 2
or 4 input sockets (1) to which initially measuring channels M0 to M1/M2/M3 are
allocated. However, ALMEMO ® sensors can, if required, provide up to 4 chan-
nels with 4 input sockets each so that altogether 16 channels are available. The
additional channels can be used in particular for humidity sensors with 4 meas-
uring variables (temperature / humidity / dew point / mixture ratio) or for function
channels. Each sensor can if necessary be programmed with several measuring
ranges or scaling settings; and 2 or 3 sensors, if pin assignment so permits, can
be combined in a single connector (e.g. rH / NTC, mV / V, mA / V, etc.). The
additional measuring channel numbers per connector go up in steps of 10 (e.g.
the first sensor has channels M0, M10, ... and the second sensor has channels
M1, M11, .... etc.).
Device-internal channels
A further innovation on devices in this series is the 4 additional device-internal
channels, these are the next after the last available socket. The first of these is
19