As the first to develop of the calorimeter in 1899, Parr now provides the most advanced isoperibol oxygen bomb calorimeters in the market.
Conforming to ASTM/ISO standards for testing of Biofuels, Coal & Coke, Food & Feed, Hydrocarbons and many more applications.

Model 6400
The Automatic Isoperibol Calorimeter  Represents the next evolutionary step in the Parr automated calorimeters. Inclusive and compact, the instrument incorporates a closed loop cooling subsystem into the calorimeter. This subsystem uses a thermoelectric cooler assembly attached directly to a one liter water tank which supplies cooling water to the calorimeter. An external nitrogen pressurized tank is used to supply rinse water to the calorimeter. This model features the fixed bomb and bucket design allowing for automated bucket and jacket fill as well as automated vessel fill and rinse. The 6400 requires one minute of operator time per test, allowing a technician to operate up to four calorimeters simultaneously.

Model 6200
This  microprocessor controlled, isoperibol oxygen bomb calorimeter is widely used for both routine and occasional calorific tests. It uses the time-tested Parr 1108 style oxygen bomb and oval bucket in a compact calorimeter, producing reliable results with good repeatability, but differing from the 6400 Model in that the bomb and bucket both must be removed from the calorimeter and refilled manually for each test, thereby requiring more of the operator’s time than the 6400 model.

Precise Electronic Thermometry
Temperatures are measured with a high precision electronic thermometer using a specially designed thermistor sensor sealed in a stainless steel probe which is fixed in the calorimeter cover. Measurements are taken with 0.0001° resolution over a 20° to 40°C working range, with all readings shown in Celsius.
Effective Thermal Jacketing
Outstanding thermal jacketing is provided by a circulating water system driven by a built-in, high capacity pump which maintains a continuous forced flow around the sides and bottom of the bucket chamber and through the cover as well. The jacket temperature is held constant for isoperibol operation and no water additions or waiting periods are required at the end of a run. A sealed immersion heater and a built-in heat exchanger, both operated by the calorimeter controller, provide precise jacket temperature control.
A Reliable Oxygen Bomb
The Parr 1108P Oxygen Bomb furnished with the calorimeter will safely burn samples liberating up to 8000 calories per charge, using oxygen charging pressures up to 40 atm. An alternate 1108PCL bomb with superior resistance to chlorine and halogen acids is recommended for tests involving waste material and chlorinated samples.
A Built-In Oxygen Filling System
To speed and simplify the bomb filling operation, the 6200 Calorimeter has an automatic system for charging the bomb with oxygen. Oxygen from a commercial cylinder is connected to a microprocessor controlled solenoid installed in the calorimeter. To fill the bomb, the operator simply slips the filling hose connector onto the bomb inlet valve and pushes the touch screen to start the filling sequence. Filling then proceeds automatically at a controlled rate to a pre-set pressure.
Automatic Standardization
The 6200 Calorimeter will automatically generate its energy equivalent (EE) value from a series of standardization tests, calculating a mean value from an operator defined number of the last standardization tests for each bomb/ bucket combination. The default number of tests is 10 as specified by ASTM and international methods. The user can enter the maximum standard deviation he will accept and the calorimeter will advise him if his tests fail to meet this criteria. Energy equivalent values for up to four bomb/bucket combinations can be stored in the computer.
Automatic Data Transfer
The calorimeter is equipped with a USB port for reporting to a printer and receiving sample weights from an analytical balance. Transferring results to a laboratory computer is accomplished using an Ethernet connection using standard network protocols.
Compatible Modular Design
The 6200 Calorimeter is fully compatible with existing 1108 Parr Bombs and closed-circuit water handling systems making it easy to fit the instrument into an existing laboratory set-up.  A modular design, with the controller electronics assembled in a removable chassis, simplifies maintenance.
Parr Fixed Bomb and Bucket Technology
The 6400 Automatic Isoperibol Calorimeter uses a fixed bomb and bucket design where the bomb and bucket are not removed from the calorimeter during routine operations. This design concept has made it possible to offer unique levels of automation for the entire calorimetric determination not just the data collection and reporting steps. The result of this automation will save approximately five minutes of operator time per test when compared to any removable bomb calorimeter.
Oxygen Charging and Release
The fixed bomb and bucket design allow the oxygen supply to be directed into the head of the bomb at the beginning of each test. The head of these bombs incorporate a check valve which dynamically seals when the bomb is pressurized. At the end of the test, the gases in the bomb are automatically released while the calorimeter is being returned to its starting temperature.
Fixed Bucket
The bucket in these calorimeters has been designed to provide smooth circulation over the surface of the vessel. The design also repeatedly fills the bucket volumetrically. The bomb head closure seals the bucket at the same time the bomb is closed. This unique design minimizes the amount of water required for the test as well as permitting rapid, automatic and repeatable filling for each test. The water heated by the combustion is automatically drained from the bucket at the conclusion of the test and replaced with cooling water to bring the bomb and bucket rapidly back down to the starting temperature for the next test.
Fixed Bomb
The 6400 Calorimeter features the patented closure design of the Parr Fixed bombs. This design allows the user to seal and lock the head into the cylinder with simple one sixteenth turn. The main bomb seal is an o-ring optimized to minimize frictional wear, improving the lifetime of this seal. At the conclusion of the test the inside surface of the bomb is washed to remove the products of the combustion from the bomb. The automation of the bomb washing step eliminates one of the most tedious and time consuming manual operations required with removable bomb calorimeters. Besides the elimination of the drudgery of manually washing the bomb, a not so obvious advantage of the fixed bomb design is that the bomb is always washed as soon as the final temperature can be determined. Generally, this is within 4-5 minutes of the time the bomb is fired. This holds to an absolute minimum the time any acids produced by the combustion can attach to the inner surfaces of the bomb. This has improved the service life of these bombs in comparison to removable bombs.
1138 Oxygen Combustion Bomb
The 1138 oxygen bomb is the standard bomb in the 6400 calorimeter. The 1138 Oxygen Bomb has been redesigned to withstand a higher magnitude of tests. The head is designed with an O-ring groove which is optimized to minimize frictional wear, in turn improving the lifetime of the seal. The bomb head is removable for fast sample loading using the patented Quick Twist-Lock vessel closure design.
A1450DD Head
Users who wish to achieve maximum through-put with their 6400 calorimeters will want to purchase a spare A1450DD head for their calorimeter. This permits the next sample to be completely prepared and inserted into the bomb as soon as the current test is concluded.
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