Calorimetry

Bomb calorimetry is a crucial test for calorific measurements


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Calorimetry covers various applications spanning coal, fuel oils, gasoline, combustible wastes, food, building materials, explosives, and more. It involves measuring heats of combustion by comparing the heat from a sample with that of a standard material. This test burns a sample in a high-pressure oxygen environment within a metal pressure vessel. The resulting energy release is absorbed, and temperature changes are recorded.
Every bomb calorimeter includes four essential components: an insulating jacket to protect against thermal stresses, a bucket with a stirring mechanism for holding the bomb and water, the bomb for burning charges, and a thermometer to measure temperature changes. Various models offer these components with differing technological advancements to suit your needs. 

Calorimeter design features

Isoperibol Calorimetr calorimeter parry
Isoperibol Calorimetry

An isoperibol calorimeter, like the Model 6400 and 6200 Calorimeters, maintains a constant temperature in the surrounding jacket while allowing the bomb and bucket temperatures to increase as combustion releases heat. These calorimeters employ a microprocessor-based controller to continuously monitor and correct for temperature differences between the bucket and jacket, ensuring accurate measurements throughout the test.


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Continuously Compensated Calorimetry calorimeter parr
Continuously Compensated Calorimetry

The Parr 6100 and 6050 Calorimeters use a real-time, continuously corrected approach for isoperibol calorimetry by monitoring and adjusting the jacket temperature based on the difference between the bucket and jacket temperatures. This method achieves similar results to traditional isoperibol calorimeters but cannot match the temperature uniformity of a circulating water jacket.

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Compensated Calorimetry calorimeter parr
Compensated Calorimetry

The Parr 6772 Calorimetric Thermometer, used with the 1341 or 6725 Calorimeters, employs a different method to emulate isoperibol calorimetry. It precisely measures heat leak during the calorimetric pre-period to estimate the average temperature of the calorimeter surroundings. It uses this value for heat leak correction throughout the test, achieving results similar to non-electronic thermometry and manual calorimetric techniques without additional hardware costs.

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Model 6400 Automatic Isoperibol Calorimeter

Designed for laboratories that require high through-put, the 6400 Automatic Isoperibol Calorimeter features a closed loop cooling subsystem and the highest automation in a calorimeter. The patented Quick Twist-Lock vessel closure design allows one operator to run up to four 6400 Calorimeters simultaneously.


Model 6200 Isoperibol Calorimeter

Featuring a removable bomb and bucket design, the Parr 6200 Isoperibol Calorimeter is our most popular calorimeter. It is a good choice for high precision quality control work and for research and development. Multiple bomb choices are available, expanding its functionality.




Model 6100 Compensated Jacket Calorimeter


The Parr 6100 Compensated Calorimeter takes advantage of the real time, continuously corrected method originally developed by Parr Instrument Company. This real time correction can produce superior results. This feature will make it attractive for coal testing, waste and refuse disposal work, and other sample testing.


 

Model 6050 Compensated Jacket Calorimeter

This new calorimeter is the first designed by Parr to be controlled by your own personal computer allowing access to the calorimeter’s functions and tests. This new moderately priced, compact calorimeter combines a static jacket system with the convenience of automated oxygen filling.


Model 1341 Plain Jacket Calorimeter

A reliable calorimeter, the 1341 can be used for the same broad range of solid and liquid combustible samples as our other more advanced calorimeters. Its modest cost and simple design make the model suitable for low throughput and minimal precision work such as sample screening and student instruction






Model 6725 Semimicro Calorimeter

The 6725 Semimicro Calorimeter is a compact, static jacket, calorimeter designed specifically for measuring the heat produced by the combustion of small samples. The small sample capacity is ideal for marine biology research as well as other applications where the available sample is limited.


Model 6755 Solution Calorimeter

The 6755 Solution Calorimeter is designed for laboratories who wish to measure enthalpy changes produced by chemical reactions in solution.




Model 6765 Combination Calorimeter

For laboratories that want to perform both Solution and Semimicro Oxygen Bomb calorimetry tests, Parr offers the 6765 Combined Calorimeter. This includes the 6772 Calorimetric Thermometer module plus a calorimeter module and conversion parts for both the 6755 Solution Calorimeter and the 6725 Semimicro Calorimeter. This option has been popular with teaching laboratories that wish to include both types of experiments in their laboratory sessions.
Conversion Sets
The 6729 and 6759 Conversion Sets are also available for users who have one of the principle calorimeters and wish to add the second capability to their installation


6772 Calorimetric Thermometer

The 6772 Calorimetric Thermometer High precision temperature measuring system is designed for use with 1341, 6725 and 6755 Model Calorimeters. Includes an ignition firing system and stirrer motor output.


                      
PARR CALORIMETER SELECTION GUIDE
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From the state-of-the-art 6400 Automatic Isoperibol Calorimeter with its innovative 1138 Oxygen Combustion Bomb to the 1341 Plain Jacket Calorimeter using the industry-standard 1108 style Oxygen Bomb, you get Parr Quality, Reliability, and World-Class Support.



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