Ahlborn ALMEMO 2450-1L, Руководство по эксплуатации, Страница: 13 / 24

8. Connecting the transducers
13
8.2
Measuring inputs and additional channels
The ALMEMO® 2450-1L measuring instrument has one input socket (1) to
which initially measuring channel M0 is assigned. ALMEMO® sensors can, how-
ever, if necessary, provide up to four channels. The additional channels can be
used in particular for humidity sensors with four measuring variables (tempera-
ture / humidity / dew point / mixture ratio) or for function channels. Each sensor
can if necessary be programmed with several measuring ranges or scaling set-
tings; and two or three sensors, if pin assignment so permits, can be combined
in a single connector (e.g. rH / NTC, mV / V, mA / V, etc.). The additional meas-
uring channel numbers per connector go up in steps of 10 (e.g. the first sensor
has channels M0, M10, M20, M30).
Double connectors with 2 x differential voltage / differential current
(input D - B) are not possible.
On the measuring instrument this gives the following channel assignment :
Sensors combined within one connector and sensors with their own power sup-
ply are electrically interconnected and must therefore be operated in isolation.
The voltage at the measuring inputs themselves must not exceed 5 volts (be-
tween B, C, D, A and - ).
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