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)


Calorimeter design to Dow Patents of 1980 and 1984; 2.5cm thick copper, 8 heaters, 6 measuring, control and safety thermocouples

Temperature range
0-600°C temperature range (specify CSU option for -40°C - 600°C)

0.002°C/min detection to 200°C, 0.01°C/min to 500°C Temperature resolution 0.001°C, Precision <0.2%, Accuracy 0.7%; thermo-couples external and internal of sample

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


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

Sample Holders
Hastelloy, titatium, steel, aluminium, glass, specials for
battery, oil & explosives ARC Bombs 9cm3, tube bombs
1cm3, low phi bombs 65cm3

1 cubic meter containment vessel (Blast Box);
3mm reinforced Steel, Proximity Switch, Door interlock;
Burst Disk Assembly. Automated Fume Extraction facility

Control Modes
Adiabatic; quasi-Isothermal, true isothermal, Isoperibolic, ramp.
Detection of endotherms and tracking of exotherms


Microsoft Windows,
National Instruments Labview Control
Software ES-ARC
Software based upon Microsoft Windows
and National Instruments Labview
(Current Version)
ARC-ES software for test set-up
and control
Full on-the-fly change of test conditions
Full on-the fly operation

Remote User facilities
Worldwide remote command & operation
of ARC using Terminal Services
Worldwide broadcast of data and status
with WebBrowser software

Virtual Technician facility
Set up unlimited runs and delay,
sequence, perform all in one program

Data Analysis
ARCCAL+ for data analysis
Allowing: Raw Data graphs, time to
maximum rate, thermokinetic modeling, time to explosion;
Data conversion to units of enthalpy, power, gas generation
Automatic Phi correction based upon kinetic model – complete merge data set facility
Report generation in Microsoft Word, or
Microsoft Excel or html
Tutorial for instruction of analysis



Full range of options available




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

ASU Option
Stirring and agitation 0-500rpm, 0-200cps

ADU Option
High pressure dosing, steel syringe, dosing to 300bar, 0-10ml, software controlled

SSS Option
Gas collection during or after test into 50cm3 collection vessel,

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

FTC Option
Fast tracking calorimeter; tracking to 150°C/min

PRU Option
Automated pneumatic lid lifting ≠EV

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 pharmospecific

CSU Option
Extend the temperature range, the cryogenic option –40-500°C


Battery Options

CPU Option
Specific heat measurement

KSU Option
Single channel battery cycler – specify voltage and current range

BSU Option
Abuse testing (shorting, over voltage
charging discharging application)

NPC Option
Automated mechanical abuse testing (nail penetration, crush)

MP Option
Multipoint thermocouple for spatial distribution measurement


Flow Options

MPF Option
Medium pressure flow and
control for EOR Oilfield sample studies

low cost add-ons designed to facilitate testing in specific areas

Low Phi Kit
– for those working in reaction mixtures and low energy samples (containing low phi containers, specific feed through tubes and burst disk assembly)

Explosives Testing Kit
– to aid tests with energetic materials (containing low volume sample holders, high volume feed through tube, burst disk assembly)

Side Branch Kit
– containing alternative pressure feed through tubes and a burst disk
assembley; this prohibits any ‘reflux’ of sample or solvent and avoids the need for any ‘tube heater’.

Battery Safety Kit
– for those working with own cycler and abuse tester

Battery Pressure Kit
– connections cables and items for connection to external cyclers and abuse testers allowing internal and external pressure measurement including canisters, gas-tight containment allowing pressure measurement and gas collection



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)
Micro Muticell Calorimeter (µMC)
Sample Testing and Consultancy Services
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