SMX 100 Refrigeration Controller, Data Logger and Alarm

The SMX 100 is a microprocessor-based refrigeration controller. It uses modern thermo technologies and three fully sealed plug-in PT100 platinum film temperature sensors to ensure that the cold-room is controlled and monitored with the greatest of ease.
The large graphics LCD display and touch sensitive dials offer a user friendly  man machine interface. Programming and setting of temperatures and defrost cycles are very friendly and uncomplicated. It offers 12 adjustable defrost cycles. One sample of product temperature is logged every 15 minutes and stored on an internal memory.
This novel approach of a paperless logging and filing system allows the data of any day in its history to be read and examined with just a few key presses.


NOTE: The information presented in this page is for guidance only - no part of this may be used for any agreement, whether express or implied, or to form any contract. THERMO TECHNOLOGIES reserves the right to change specifications and prices without prior notice.


  • Cold-room, product and evaporator temperature displays
  • Large, clear display of room, product and evaporator temperature with rise/fall indication
  • 50-year clock / calendar with battery back-up for up to 1 hour power blackout
  • Cold-room temperature set in 1°C steps from -50°C to +50°C
  • Cold-room thermostat differential in 1°C steps from 0°C to 10°C
  • Compressor switching delay (limited for avoiding short-cycling) from 1 to 99 minutes
  • Fan enable temperature for inhibiting fan when evaporator is still warm after defrost
  • 12 Cycles of defrost (arranged in two groups of six, with independent duration, termination temperature and dwell period for each group)
  • Manual defrost activation and override
  • 24 VDC, 115 VAC and 230 VAC power options
  • Complies with EU EMC Directive 89/336/EEC
  • Alarm high and low first stage threshold temperature adjustable in 1°C steps from -50°C to +50°C with independent delays adjustable in 1 minute steps from 1 to 99 minutes
  • Alarm high and low second stage limits adjustable in 1°C steps from -50°C to +50°C.
  • Alarm mute and reset facility
  • Alarm relay output with 5A isolated (volt-free) changeover contacts
  • Status screen for indication of system state
  • Diagnostics screen for trouble-shooting
  • Alarm history record for low alarm, high alarm and power fail
  • Battery back-up for power blackout operation


Data Logger

  • Paperless data logger with automatic filing by date
  • Product temperature sampled and stored every 15 minutes
  • Defrost and alarm state sampled and stored every 15 minutes
  • Contents of internal databank can be transferred directly to the PC using the MASTERLINK Software or via a MASTERLINK Hardware module.
  • "Percentage of internal databank used" indication in bar graph and digital form
  • "Internal databank almost full" indication with 3 weeks notice before data transfer is necessary.
  • 2.5 Year internal reusable databank for datalogging


Three identical temperature sensors are included in a standard package. Each sensor is supplied with 45 feet of outdoor cable. If required, sensor extenders are available. If sensors need to be extended and factory-made extenders are not available, they can be extended using a suitable four core cable.



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