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NOTE
4. Installation
CAUTION
SDM-CD16D
Connection with External Supply
SDM-CD16D
Connection with Datalogger Supply
Figure 3 Connection Block Diagrams
If the 21X power supply is used to power the SDM-CD16D, all low
level
analogue
measurements
thermopiles, etc.) must be made differentially. This is a result of slight
ground potentials created along the 21X analogue terminal strip when
the 12V supply is used to power peripherals. This limitation reduces
the number of available analogue input channels and may make an
external supply for the SDM-CD16D essential.
For correct operation the SDM-CD16D must be installed where there is no
risk of water ingress or condensation.
The order in which connections are made is critical. Always
connect 12V first , followed by ground, then the control ports.
For datalogger connections, see Table 1, below. Please refer to Figure 4 for details
of how to use the spring-loaded terminals.
EXTERNAL
9 TO 18V DC
+
–
GND
DATALOGGER
C1
12V
C2
C3
GND
12V
DATALOGGER
C1
C2
C3
(thermocouples,
pyranometers,
User Guide
3
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