Campbell Scientific AM16/32B Relay Multiplexer - Manual (Page 43)

AM16/32B Relay Analog Multiplexer
• Multiplexer to Datalogger Wiring — If the reference junc
datalogger, then the wire that connects the COM ODD H, COM
L, and COM EVEN H terminals to the datalogger should be
same composition as the high side of the thermocouples
wire that connects COM EVEN L to datalogger ground s
the same composition as the low side of the thermocouples.
• If the reference junction is at the AM16/32B (Campbe
thermistor, RTD, etc.), then copper wire should be u
COM terminals to the datalogger.
tion is at the
ODD
of the
. Also, the
hould be of
ll Scientific 107
sed to connect
6.6.3 Differential Thermocouple Measurement
AM16/32B panel switch set to “2x32” mode.
Multiplexer to Datalogger Wiring — The wire types here can be handled in
one of two ways. If a reference junction (107 thermistor, or RTD, etc.) is at the
AM16/32B, then one copper wire may be run between the COM terminals of
the multiplexer and the datalogger input channel.
If the reference junction is at the datalogger, then matching thermocouple wire
should be run between the COM terminals of the multiplexer and the
differential input channel on the datalogger (observe TC wire polarity).
6.7 Mixed Sensor Types
In applications where sensor types are mixed, multiple hookup configurations
and programming sequences are possible. Please consult Campbell Scientific
for application assistance if you need to multiplex markedly different sensor
types in your application.
6.7.1 Mixed Sensor Example: Soil Moisture Blocks and Thermocouples
nd 16 soil moisture blocks will be
. One thermocouple and one soil moisture
AM16/32B panel switch set to “4x16” mode.
In this example, 16 thermocouples a
multiplexed through the AM16/32B
block are input into each SET.
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