Accelerating Rate Calorimeter

The Enhanced System Accelerating Rate Calorimeter

The world's best selling and benchmark adiabatic calorimeter. Giving full adiabatic runaway information for both temperature and pressure events.

Accelerating Rate Calorimeter

Devised by Dow Chemical Company in the 1970's, an explosion at a Dow UK site led to commercialisation of ARC technology. The Chemical Processing Industry has been safer from its first availability in 1980! The ARC has specific features and advantages that make it unique and preferable to all other technologies that were available at this time - and today 30 years later this technology is still the number one choice for most people focusing in the area of quantifying exothermic reactions, effect of heat upon materials and simulating runaway reactions.

THT has played the major role in ARC technology development and has continuously kept ARC technology in manufacture. THT has produced up-to-date instruments and has extended and enhanced the technology as requested, by users. THT has worked with users worldwide to understand their needs and to develop new products and applications.

Key Aspects of the ARC:

  • Excellent adiabatic control
  • Universal sample type
  • Ultimate sensitivity
  • Ease of use
  • Simplified data analysis
  • Worldwide data acceptance
  • Safe in use


  • Additional larger calorimeters
  • Options for battery applications

And Latest Features:

  • Greater stability
  • Higher sensitivity
  • Wider temperature range
  • More versatile additional isothermal modes
  • Remote operation worldwide
  • Virtual technician
  • Endotherms/Exotherms
  • Zero reflux
  • Gas flow
  • Low Phi containers
  • Fast tracking calorimeter
  • Pressure compensation calorimeter
  • Correction to phi = 1
  • Heat capacity measurement
  • Automatic data conversion to... Joules, Watts, moles/g


Temperature & pressure data for AIBN (an Azo initiator)


Fully compliant to ASTM E1981 (all revisions)
Calorimeter design to Dow Patent No 4439048 of 1980 and 1984
9cm diameter; 10cm depth calorimeter
2.5cm thick copper, 8 heaters, 6 measuring, control and safety thermocouples
Thermocouple resolution 0.001°C, Precision <0.2%, Accuracy 0.7%
Adiabatic Control to 0.01°C

Temperature range
0-600°C temperature range (-40°C with Cryogenic System Unit CSU option)
Tracking Rate to 20°C/min
Fast Tracking Option (FTO) to 200°C/min

Sensitivity (applicable to new calorimeters only)
Potential to achieve 0.002°C/min to 200°C
                                0.01°C/min to 500°C

Pressure Range 0-200 bar (or specify range to 700 bar with alternative transducers), Resolution 0.005bar, Precision 0.02%, Accuracy 0.05%

0.25 cubic meter containment vessel (Blast Box);
3mm reinforced Steel, Proximity Switch, Door interlock;
Automated Fume Extraction facility

Control Modes
Adiabatic; Ramping, Isothermal modes, True Isothermal, Isoperibolic, Step Isothermal.

Sample Holders
Hastelloy, titanium, stainless steel, aluminium, glass, ARC bombs (9cm3), low phi bombs (65cm3) tube bombs (1cm3) special open or closed holders for any battery type.

Customer Support

Installation & Training - 1 week, acceptance test

Guarantee 1 year, free of charge phone and email support over lifetime of instrument

Part Supply
10 years guaranteed

Manuals - Full Operations and Data Analysis Manuals with Tutorials


Control Software
National Instruments Labview based ARC-ES Control Software 
Full on-the-fly change of test conditions
Full on-the fly operation

Remote User facilities
Ability to transfer operation on system to any allowed PC over network or internet

Virtual Technician facility
Set up multiple tests in one method

Data Analysis Software
National Instruments Labview based ARCCAL+ analysis software
Features include: Graphical and tabulation of raw data including Phi Corrected TMR plots
Data Conversion to Enthalpy, Power, Gas Generation     
Kinetic Modelling for thermodynamic and kinetic data analysis
Phi Correction through kinetic modelling
Report generation in Microsoft Word, Excel, HTML
Analysis of 9 concurrent data sets; 3 analyses on each data set, merge all datasets to a single plot.

Operation / Ambient Environment

Environmental Requirements
Temperature 5-45°C, Humidity 0-95%
Air supply (Optional for rapid cooling post test)
Water (needed only for CSU)

Electrical Specification
Single Phase Electrical Supply 100-250V, 16A 3.5kW
Instrument conforms to CE, UL, VCCI, CSA standards

Full range of options available



Options for chemical applications

Want or need to do more?
Ultimate functionality. THT offers an unrivalled choice of options. Many are listed below.

FTC Option
Fast tracking option; tracking to 200°C/min

GSS Option
Safe gas release during or after test through Scrubber tank, software controlled

SSS Option
Gas collection, 1 sample – automatic collection at any temp or on test completion, 50ml collection vessel

SSU Option
Gas collection, 4 samples – automatic collection at any time, temp, pressure, 50ml collection vessel

ADU Option
High pressure dosing, steel syringe, dosing to 150bar, 0-20ml, software controlled

MDU Option
Low cost Manual Dosing Unit (0-10ml at ambient

MDU Option
Low cost manual dosing unit (0-10ml at ambient pressure)

FHU Option
Ultimate fume extraction (30 cubic meters per minute), to meet all Pharma regulations

CSU Option
Extend the temperature range from -40 to 500°C, with the cryogenic option

ASU Option
Stirring and Agitation 120-500rpm, 0-200cps viscosity

VSU Option
Vent Size testing; Tempering, Blow Down and Hydrodynamic tests, software controlled

PRU Option
Automated pneumatic lid lifting

For oil exploration applications

MPF Option
Medium pressure flow and control for EOR Oilfield sample studies, gas flow up to 200 bar

HPF Option
High Pressure flow and control for EOR Oilfield sample studies, gas flow up to 400 bar

Options for battery applications

CPU Option
Automatic Specific Heat Measurement up to 120°C

KSU Option
Single Channel Battery Cycler – Customer specified voltage and current range

SCO Option
Button operated electronic contactor and high-current cables for external short circuiting of batteries under adiabatic conditions. Optional current transducer for shorting current measurement.

NPC Option
Automated Mechanical Abuse testing (Nail Penetration, Crush) up to 34kN force

MPO Option
Multipoint thermocouple for spatial distribution measurement


Kits: Low cost add-ons designed to facilitate testing in specific fields

Low Phi Kit
For those working in reaction mixtures and low energy samples

Explosives Testing Kit
For those working with energetic materials

Battery Safety Kit
For those working with own cycler and abuse tester

Battery Abuse and Pressure Kit
Hardware add-ons to allow simulation of abuse tests

Click here to view downloads


A full range of spares and consumables are available from our eshop
Low Φ containers
Designed by THT these low Φ containers are designed to enable accelerating rate calorimeter users to bridge the gap into the world of low-phi testing. These cells are available with several different fittings and can also be fitted with magnetic stir bars. Currently these containers are offered in stainless steel although other materials can be produced. Contact us for further details.

Burst disk unit
THT has designed this burst disk assembly, which is suitable for any accelerating rate calorimeter. Designed to sit above the calorimeter, this device enables the user to protect the system from cell ruptures. The user can fit a number of special burst disks which are designed to rupture at specific pressures and will cause the cell to rapidly discharge. Any liquid vented will be contained within the catch pot. This system is ideally used alongside low-phi containers and glass bombs

Battery sample holders
THT manufactures holders for specific batteries to enable testing in both open and closed (with pressure connections) modes. THT are able to manufacture special holders for any battery dependent on a specified minimum order. Please contact us with your specific requirements.


Request Info

Click here to request more information

The ARC with specialised options is available for sample testing.

THT offer a commercial service for clients with minimal testing requirements and cannot justify an instrument purchase.

Hallmarks of this service are

  • Confidentially
  • Cost effective
  • Speed
  • Expert analysis

The service can range over all of THT's calorimeters and include DSC and purpose constructed test facilities.

Components of batteries and small batteries can be tested using the ARC. For larger cells the EV-ARC can be used.


Request Info

Click here to request sample information

Request Information

I'm interested in the following services

ES-Accelerating Rate Calorimeter (ES-ARC)
EV-Accelerating Rate Calorimeter (EV-ARC)
EV+Accelerating Rate Calorimeter (EV+ARC)
Battery Performance Calorimeter (BPC)
Rapid Screening Device (RSD)
Isothermal Battery Calorimeter (IBC)
Micro Reaction Calorimeter (µRC)
Ultra Stable Isothermal Calorimeter (UIC)
Sample Testing and Consultancy Services
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