AM25T 25 Channel Solid State Multiplexer

The AM25T sequentially connects up to 25 thermocouples or other low-level voltage output sensors to a common differential channel.

The output from this channel is wired to a differential input channel on the datalogger. As the AM25T sequentially changes channels, the datalogger measures the output from each thermocouple in sequence. Type T, E, J, and K thermocouple measurements are standard; other thermocouple types are also supported (depends on datalogger model and operating system). Compatible dataloggers include the CR1000(X), CR300-series, CR800-series, CR6, CR3000, CR5000, and many of the retired Edlog datalogger (please enquire).



  • Multiplexes up to 25 thermocouples
  • Allows several AM25Ts to be controlled by one datalogger
  • Includes an on-board PRT that serves as a reference junction
  • Conforms to EN55022-1:1995 and EN50082-1:1992
  • MUXPOWER-L and MUXSIGNAL-L cables available to interface with datalogger



  • Power: 9.6 to 16 Vdc (under load), unregulated
  • Current drain: 0.5 mA, quiescent; 1.0 mA, active
  • Maximum switching current: 25 mA
  • Operating Temperature Range: -40° to 85°C


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