Campbell Scientific AM16/32A Multiplexer - Manual (Page 37)

AM16/32A Relay Analog Multiplexer
Multiplexer to Datalogger wiring - If the reference junction is at the
datalogger, then the wire that connects the COM ODD H, COM ODD
L, and COM EVEN H terminals to the datalogger should be of the
same composition as the high side of the thermocouples. Also, the
wire that connects COM EVEN L to datalogger ground should be of
the same composition as the low side of the thermocouples.
If the reference junction is at the AM16/32A (CSI 107 thermistor,
RTD, etc.), then copper wire should be used to connect COM
terminals to the datalogger.
6.6.3 Differential Thermocouple Measurement
AM16/32A panel switch set to “2x32” mode.
Multiple
handled in one of two ways. If a reference junction (107 thermistor,
copper wire may be run
xer and the datalogger
6.7 Mixed Sens
In applications where sensor types are mixed, multiple hook-up
possible. Please
consult CSI for application assistance if you need to multiplex
6.7.1 Mixed Sensor Example: Soil Moisture Blocks and
Thermocouples
AM16/32A panel switch set to “4x16” mode.
In this example, 16 thermocouples and 16 soil moisture blocks will be
multiplexed through the AM16/32A. One thermocouple and one soil
moisture block are input into each SET.
xer to Datalogger wiring - The wire types here can be
or RTD, etc.) is at the AM16/32A, then one
between the COM terminals of the multiple
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).
or Types
configurations and programming sequences are
markedly different sensor types in your application.
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