- PROTHERM 455 -



4th Generation Touch-Screen Enabled Process Controller For Heat Treating

Drop-in Replacement for CarbPro, DualPro and MultiPro *


The PROTHERM 455 is a 1/2 DIN powerful controller designed to monitor, control and record a variety of heat treating processes. Used in new furnaces as well as for refurbishing or updating existing systems, it is ideal for nitriding, nitrocarburizing, carburizing, carbonitriding, hardening, tempering and vacuum furnaces.

*Additional engineering may be required if DualPro or MultiPro use background logic programs.

  • Direct drop-in replacement for Marathon’’s CarbPro, DualPro, MultiPro, and Carb PC *
  • Supports Marathon recipes
  • Compatible with all legacy Marathon software
  • Redundant probe feature is standard
  • Full touch screen functionality makes intuitive menu-driven interface even simpler to use
  • Configured for 3 Internal PID loops, expandable to 32 control loops, to regulate configured process parameters such as furnace temperature, quench oil temperature as well as atmosphere parameters (e.g., carbon flow, carbon potential, nitriding potential, oxygen potential and many others)
  • Soft PID controllers within the device can be set-up in a cascade
  • Advanced auto-tuning PID and Cascade capabilities
  • Load-oriented treatments – real-time monitoring of jobs at all stages of the process
  • All process parameters can be configured with alarm limits
  • Built-in trending capability
  • Process variables are viewed and recorded by chart recorders
  • Log files can be downloaded to a remote computer for archiving & viewing with UPC chart recorder
  • Encrypted log files
  • Security level password protection – user access to different functions is password protected
  • Up to 200 treatments and templates can be created, modified and controlled
  • 200 foreground programs in easy to use, industry standard opcode language
  • Acts as a highway supervisor for up to 16 slave instruments. Communications compatibility with popular temperature controllers
  • Supports legacy MMI and MODBUS protocols as well as Ethernet MODBUS over TCP
  • Compatible with all popular data acquisition software application packages
Programs (200) 19-step foreground
Control Outputs (8) 120-220 VAC fused triacs rated at 1 Amp
Alarm Outputs (4) 120-220 VAC fused triacs rated at 1 Amp, assignable as process, deviation, deviation band, or program actuated
Event Input/Output (VAC) (4) 120-220 VAC fused triacs rated at 1 Amp, expandable to 68 events with external modules
Event Input/Output (VDC) (16) 24VDC isolated hi-side switching with external 24V supply connections. Events can be configured for either input or output
Analog Outputs (4) optically isolated 0-10 VDC, 0-20mA, 4-20 mA for process variable recording or programmable use
Analog Inputs (4) optically isolated; selectable: T/C, RTD, current, voltage or O2 probe
Input Linearization 3 user definable curves
programmable offset and span
1 RTD, 100 ohm platinum, alpha = .00385 (DIN 43 760)
Thermocouples: B, C, E, J, K, N, NNM, R, S, T
Linear voltage
Linear current
Serial Interface (4) optically-isolated ports, rated to 19.2kb, full or half duplex
Control Loops (4) based on any input or any calculated variables

Check out our 8-part video series on the Protherm 455.

These videos cover the mechanical design, graphic user interface (HMI), collection of software modules for data logging, log chart viewer for generating CQI-9 compliant reports, and instructions for configuring I/O channels and calibration procedures as well as for setting up communications for a multi-zone configuration.


Intro to Mechanical Design



Using Data Logging with Recipe Programs



Setting Up a Pusher Furnace with Slave Instruments



Setting Up Communications for Slave Instruments on a Multi-zone Furnace



Understanding the Graphic User Interface (HMI), Part 1



Understanding the Graphic User Interface (HMI), Part 2



Working with Log Files Using The Log Chart Viewer



Calibration and Configuration of I/Os