Controller & Programmer - Type 1650CC | Gefran | Philippopoulos s.a.
Controller & Programmer - Type 1650CC | Gefran | Philippopoulos s.a.

Controller & Programmer - Type 1650CC | Gefran

Gefran 1650CC Carbon Controller

The Gefran 1650CC is a dual-loop PID carbon controller designed for thermal processing furnaces in metallurgical applications, where both furnace temperature and carbon potential require precise control. It supports direct input from zirconium oxide sensors and calculates in-situ carbon percentage within the furnace atmosphere.

Inputs and Measurement

The device processes temperature and millivolt signals from a zirconia probe for carbon potential regulation. A third analog input is configurable for thermocouple or linear signal, enabling independent or cascaded control of both carbon and temperature loops. Sampling interval is specified at 60 ms, suitable for dynamic process environments.

Process Control

The 1650CC supports single or dual-loop PID operation, valve actuation, logic function blocks, and mathematical operations. In carburizing furnaces, it can modulate enrichment gas, air, or carrier gas flow via valve, actuator, or analog output, depending on panel configuration and process requirements.

Burnoff and Zirconia Probe Diagnostics

Integrated burnoff sequencing periodically cleans the zirconia sensor from carbon-rich deposits. During cleaning, calculated values are held to prevent process loop disturbance. Diagnostics utilize impedance and mV recovery ramp analysis post-purge for probe health assessment.

Communication and Integration

Supported protocols include Modbus RTU master/slave, Modbus TCP slave, RTU/TCP bridging, webserver access, weekly RTC, three access levels, and multilingual diagnostic/configuration messages.

Typical Applications

  • Carburizing and carbonitriding furnaces
  • Metallurgical kilns with zirconia oxygen probes
  • Endothermic atmosphere control
  • Thermal processes requiring AMS2750/CQI-9 compliance
  • Installations with remote diagnostics via Modbus or webserver

Standards

UKCA declaration covers 1650CC / 1650CCP / 1650CCV / 1650CCPV variants, referencing EN 63000:2018, EN 61326-1:2013, and EN 61010-1:2010.

Datasheet and documents

Description

Technical specifications

Overview

PID controller and measurement of carbon potential in metal heat treatment applications.

The direct connection of the zirconium oxide probes, the efficient algorithm for percentage of carbon calculation inside the furnace combined with a precise PID control, provides a safe and compact control solution even for critical applications.

Single / Dual loop PID controller

Thanks to the third analog input, in addition to the temperature and mV signals required for zirconia probe management, the 1650CC controller is able to control both the Carbon Potential control loop and the furnace temperature control loop.  

Embedded Zirconia proble cleaning Burnoff sequence

The zirconium oxygen probe is a particularly sensitive sensor and due to its installation inside a furnace with a carbon-rich atmosphere, after several hours of operation, it needs cyclic cleaning sequences to remove material deposition on the measuring element, a problem that can cause an error in the measurement of the carbon percentage or reduce the average life of the probe.

For this purpose, the PID controller automatically manages the timed cleaning sequence, also handling the status of the calculated values, which must remain frozen during the cleaning phase.

Zirconia probe diagnostics

Probe diagnostics, useful to verify and ensure the correct functionality of the measurement sensor. Two typical values are used to evaluate proper probe functionality, the impedance and the mV voltage recovery ramp after a Burnoff purge sequence.

Deviation of these values over time, indicating a probe problem, are monitored and reported as alarms by the new Carbon Controller series.  Likewise, any errors during the cyclic purge phase are reported.  

Connectivity and Remote Service

Modbus RTU master/slave, Modbus TCP slave and Modbus RTU/TCP bridge.

Embedded Webserver interface for fast and easy remote assistance.

Description

  • Dual loop PID Carbon Controller
  • Zirconia probe input
  • Aux analog input configurable temocouple, linear value
  • Sampling time 60ms
  • AMS2750/CQI-9 conformant
  • Valve control
  • LOgic and Math function blocks
  • Modbus RTU master/slave
  • Modbus TCP slave
  • Bridge Modbus RTU/TCP
  • Webserver
  • Weekly clock (RTC)
  • Access protection three levels
  • Multilanguage diagnostics and configuration text messages

Certifications

UK Conformity declaration - 1650CC - 1650CCP - 1650CCV - 1650CCPV