Created in 1965 to address the market need for Precision Control Instruments, the Eurotherm brand grew through investment in R&D activities and acquisition of Industry leading brands including Chessell (Data Recorders), Action (Signal Conditioners), Barber Colman* (Actuators) and Continental (Solid State Relays).

Eurotherm is now a leading global supplier of control, measurement and data recording solutions and services to industrial and process customers. The company’s international reputation as a provider of innovative solutions across a broad spectrum of vertical markets is supported by engineering services designed to realise greater benefits to customers’ plant-wide assets.

Eurothem Single loop and Multi loop Temperature Controllers and Process Indicators and Alarm Units are cost effective, with advanced functionality including math, logic, timing and set-point programming.

Our comprehensive range of controllers and alarm units enable you to choose from a vast range of products designed by a company with over 40 years of control expertize.

Where process data needs to be logged over an extended period of time a data recorder can be used, providing secure data storage and easy access to process records.

Collection of data can be required for compliance with some industry regulation, particularly in Heat Treatment (AMS2750) and Life Sciences (21 CFR).

Chessell Paperless Graphic, Strip Chart and Circular Recorders

Eurotherm Chessell produce a wide range of products to meet your data recording, archiving, and management needs.

Your data has value and we can give you peace of mind. Whether it is one of our paperless graphic recorders with the highest level of electronic file protection, or an accurate and robust strip chart recorders you can count on Eurotherm to be sure of data security.

DAQ Software

Powerful hardware and software to tailor the recorder to the needs of your application. All our recorders have a vast array of hardware and software options, all of which can be added in the field as and when you need them. /p>

Eurotherm Chessell supporting software enables you to configure online and off, remotely view real time data, create historical charts and application specific reports.

For the control of electrical heating or other switching applications, here you will find a range of Solid State Relays (SSR) and Power Controller assemblies to suit every need:

  • Constant load
  • Variable resistance
  • Inductive load
  • Transformer coupled
  • Single Phase
  • Three Phase
  • Multi Phase
  • Application specific units can range up to several thousand amps with external driver options
  • Save energy costs by using the Predictive Load Management feature on our latest, most flexible power controller - EPower™

Our range provides two alternative types of temperature sensor – thermocouple or platinum resistance thermometer (PRT).

General guidance for choosing between the two:

Thermocouples are less expensive than PRT sensors, more versatile, less accurate, more rugged, more sensitive, have a wider operating range, are tip sensitive and can be smaller. Extension cabling is more expensive. Various calibrations are available for different applications.

PRT assemblies are much more accurate and stable, permit greater resolution of measurement but over a more limited range, are stem sensitive, larger and more expensive. Extension cabling is by inexpensive copper wire.

Remember the type of sensor chosen must suit the associated instrumentation.


For practical purposes, thermocouples are divided into two categories; base metal types such as Nickel Chromium v Nickel Aluminium and Iron v Copper Nickel (Constantan) and rare metal types (usually Platinum v Platinum Rhodium). Measuring junctions are formed by a spot weld of the two dissimilar wires usually located inside a protecting sheath.

A thermocouple does not measure the temperature at the "hot" (measuring) junction but is a differential measurement between the "hot" junction and the "cold" (reference) junction. For accurate temperature measurement, the reference junction must be held at a fixed, known temperature; alternatively, accurate compensation must be made for any temperature variations of the reference junction.

In the majority of industrial applications, instruments configured for thermocouple inputs incorporate some form of automatic cold junction compensation (C.J.C) The temperature of the input termination is sensed and a corrective signal is applied to the measuring circuit of the instrument. High accuracy automatic CJC is incorporated in all Eurotherm instruments.

For purposes of calibration of a thermocouple or the associated instrument, reference is made to standard tables which indicate thermocouple output versus "hot" junction temperature with the "cold junction" at 0°C. Where it is impractical to maintain a 0°C cold

junction temperature it is necessary to accurately measure the "cold Junction" temperature, say at 20°C and to add the value of thermocouple output at that temperature (obtained from the table) to the observed output from the thermocouple to arrive at an absolute figure.