593 Unit - Isothermal BoxA 593 unit lets a Microlink 751, Microlink 752 or Windmill 751-SG unit monitor thermocouple temperatures. It is an isothermal box which also provides screw terminals, allowing the signals to be permanently wired. |
The box sits next to the PC and includes a cold junction sensing RTD (resistance temperature device) with an associated constant current source (0.8 milliamps). The RTD is used to determine the temperature at the termination point. This reference temperature is used with the analogue input channel's voltage reading to calculate the temperature at the thermocouple's junction.
The cold junction is automatically connected to the auxiliary channel on the Microlink card and compensated for in software. The channel is read directly showing the cold junction temperature in Celsius.
The unit also offers protection from high voltages when series resistors are fitted. Noise problems can be solved by fitting an input filter and broken thermocouple leads can be detected.
For more details on thermocouple monitoring see Issue 5 of our free newsletter on our corporate web site.
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