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Vacuum heat treatment control solutions Optimizing efficiency and regulatory compliance

Meeting the requirements of industrial vacuum heat treatment standards is easier with accurate control of temperature and vacuum pressure.


Vacuum heat treatment control

Choose from a range of control solutions designed to help you achieve:

• Surface hardness specifications
• Conforming microstructure
• High quality finish

Optimize cycle times, and record the process to meet heat treatment data regulations.

Applicable heat treatment standards

2704VC, ideal for vacuum control


• High vac / low vac control
• Furnace temperature control
• Setpoint programming

Associated products:

• 6100/6180 data recorder

Eurotherm vacuum cycle overview

Vacuum control

Provides multi-setpoint control via a setpoint program and sequencing of the vacuum pumping system, with bumpless transfer between low vac and high vac gauges.

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E+PLC100, ideal for vacuum heat treatment (HT) control


• High vac / low vac control
• Furnace temperature control
• Load thermocouple inputs
• Setpoint programming
• Inbuilt trend and tamper resistant data recording

Eurotherm vacuum cycle overview

Vacuum HT control

Provides multi-setpoint control via a setpoint program and sequencing of the vacuum pumping system, with temperature cycles.

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E+PLC400 with E+HMI, ideal for advanced carburizing control systems


• High vac / low vac / partial pressure control
• Furnace temperature control
• Load thermocouple inputs
• Quench gas control (gas type/pressure)
• Setpoint programming
• Inbuilt trend and tamper resistant data recording
• IIoT (Industrial Internet of Things) ready
• Easily integrated with 3rd party PLCs (hybrid system)

Eurotherm vacuum cycle overview

Advanced vacuum HT system control

Setpoint control as above, plus leak-rate detection and pumping-time systems to aid the optimization of cycle-times. This IIoT ready system also allows enhancement with predictive maintenance functionality.

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Control system overview

Features and functions

T/C block

The thermocouple linearization function block converts the mV input reading and cold junction temperature into a temperature output. It also provides scaling, low pass filtering, offset and manual-override capabilities.

Autotune PID control

Provides a channel output to control a process variable (PV), using a precision PID control algorithm designed by Eurotherm. Autotune is included, as well as a ‘cutback’ feature to control overshoot behavior. A gain scheduling feature is available for adding extra PID tuning sets, to help maintain tight control at different setpoints.

Thermocouple life*

Derives the working lifespan of thermocouples in days or number or times used, under different ranges of operating temperature. The block monitors usage times and temperatures, and indicates whether the thermocouple is still valid for use according to the AMS2750E standard.

* Available in E+PLC only

Vacuum input

Converts raw electrical measurements into vacuum pressure values. It also supplies a gas calibration factor for non-N2-type atmospheres, low pass filtering, offset, and manual override. Provides vacuum gauge linearization for several common vendors, as well as user defined linearization capability.

Gauge switch

Allows for smooth (bumpless) switching between a “low” vacuum gauge, such as a Pirani gauge, and a “high” ionization type such as an inverted magnetron or Penning gauge.

Pump-down timer

Optimizes vacuum cycle time by alerting operators to a controller detected event or leak in the vacuum system. It can be configured to signal an alarm if a particular vacuum pressure has not been reached in a given amount of time.

Leak rate

Implements a leak test strategy for a vacuum chamber, using industry standard leak-rate methodology

Vacuum sequence and integrated control systems

Example solutions dependent on I/O options

1.E+PLC400 with any number of modules from zero upward can be used to create a hybrid advanced vacuum heat treatment control system, in combination with Schneider Electric, Eurotherm and 3rd party PLCs.

Product I/O options shown are for example only. Contact your local Eurotherm sales representative to discover the most suitable solution for your process.

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Scalable integrated systems and services, from single machine to enterprise solutions, including:

• Power control (SSR/SCR) and process control
• Data management, alarm management and supervisory systems
• System design, engineering and installation
• Calibration and maintenance services

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