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The PROTHERM 20 is designed for cost-effective measurement and control of carbon content, oxygen content, and dewpoint. The unit provides simple 2-point (on/off) control, continuous PID control, or 3-point stepping control.


Furnace Atmosphere Control

  • Monitoring and PID control of: C content, oxygen content or dewpoint

  • Input for connecting lambda-sensor

  • Automatic and manual sensor purging

  • Sooting alarm

  • Gas-correction input CO or hydrogen (H2) compensation

  • Calibrating function for the atmosphere input


  • Three analog inputs, two are universal

  • Two freely configurable analog output, e.g. as process value output

  • High-impedance mV input for O2 sensors

  • Oxygen calculation (ppm /%O2, automatic adaptation)

  • Carbon content calculation (%C, 2 decimals)

  • Dewpoint calculation (°C, °F selectable)

  • Self-Tuning to the setpoint without oscillation

  • Valve controller with position feedback and DAC monitoring

  • 3-point controller for water, fan and oil cooling

  • Universal continuous/switching version, i.e. reduced stocks

  • 100 ms cycle time, also suitable for fast control loops

  • 20 ms as shortest pulse-length

  • Customer-specific Linearization for all sensors

  • Settings can be blocked via password and internal switch for high security

  • Extended temperature range up to 140°F (60°C) allows mounting close to the process

  • Easy 2-point or offset measurement correction

  • Monitoring of heating current and output circuit

  • Emergency operation after sensor break by means of the “output hold” function

  • Logical combination of digital outputs, e.g. for general alarm

  • Manual gain scheduling

  • RS 422/485 Modbus RTU interface

  • PROFIBUS-DP interface

  • Built-in transmitter power supply

  • Splash-water proof front (IP 65)

  • Front interface port

  • BluePort®Front interface and BlueControl software

  • Customer specific data-set

  • Maintenance manager and error list

  • Day & Night display shows plain text and bar graphs

  • Type tested to EN 14597 (replaces DIN 3440) and cULus


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