The 6400 Isoperibol Automated Calorimeter represents the next evolutionary step in Parr’s automated calorimeters. The compact and compact instrument incorporates a closed-loop cooling subsystem into the calorimeter. This subsystem utilizes a thermoelectric cooling unit attached directly to a one-liter water tank that supplies cooling water to the calorimeter. An external pressurized nitrogen tank is used to supply wash water to the calorimeter. This model features a fixed bomb and bucket design that provides automatic bucket and jacket filling, as well as automatic vessel filling and rinsing. The 6400 requires one minute of operator time per test, allowing a technician to operate up to four calorimeters simultaneously.
Design features
Fixed bomb and Parr bucket technique
The 6400 Isoperibol Automatic Calorimeter utilizes a fixed bomb and bucket design, in which the bomb and bucket are not removed from the calorimeter during normal operations. This design concept has allowed it to offer unique levels of automation for the entire calorimetric determination, not just the data collection and reporting stages. The result of this automation is a savings of approximately five minutes of operator time per test compared to any removable bomb calorimeter.
Oxygen charging and releasing
The fixed design of the bomb and ladle allows the oxygen supply to be directed to the bomb head at the beginning of each test. The head of these bombs is equipped with a check valve that dynamically seals when the bomb is pressurized. At the end of the test, the gases in the bomb are automatically released when the calorimeter returns to its original temperature.
Fixed bucket
The bucket in these calorimeters has been designed to allow for smooth circulation over the surface of the vessel. The design also repeatedly fills the bucket volumetrically. Closing the bomb head closes the bucket at the same time as closing the bomb. This unique design minimizes the amount of water required for the test and also allows for rapid, automatic, and repeatable filling for each test. After the test is complete, the water heated by combustion is automatically drained from the bucket and replaced with cooling water to quickly return the bomb and bucket to the initial temperature for the next test.
Fixed bomb
The 6400 calorimeter features the patented Parr Fixed bomb closure design. This design allows the user to secure and lock the head in the cylinder with a simple sixteenth turn. The primary bomb seal is an O-ring optimized to minimize friction, which improves the life of this seal. At the conclusion of the test, the interior of the bomb is flushed to remove combustion products from the bomb. Automation of the bomb flushing step eliminates one of the most tedious and time-consuming manual operations required for removable bomb calorimeters. In addition to eliminating the difficulty of manually flushing the bomb, a less obvious advantage of the fixed bomb design is that the bomb is always flushed as soon as the final temperature can be determined. Typically, this is within 4-5 minutes of the bomb being released. This reduces to an absolute minimum the time during which any acids produced by combustion can adhere to the internal surfaces of the bomb. This has improved the service life of these bombs compared to detachable 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 higher test loads. The head is designed with an O-ring optimized to minimize friction, which in turn improves seal life. The bomb head is removable for quick sample loading using the patented Quick Twist-Lock vessel lid design.
The bomb is made of Alloy 20; a special niobium-stabilized stainless steel selected for its resistance to mixed nitric and sulfuric acids produced during combustion. The 1138CL is made of halogen-resistant Hastelloy G30™. Hastelloy 30™ is a cobalt-molybdenum-rich alloy that is able to resist the corrosive effects of free chlorine and halogen acids produced when samples containing significant chlorine are burned. While no alloy will completely resist the corrosive atmosphere produced when samples containing halogen compounds are burned, users who intend to test these materials are advised to select the 1138CL bomb.
The volume of these bombs is 250 ml and the working pressure is 2000 psi. The bombs have been hydrostatically tested to 3000 psi.
A1450DD Head
Users who want to achieve maximum throughput with their 6400 calorimeters will want to purchase the A1450DD replacement head for their calorimeter. This allows the next sample to be fully prepared and inserted into the bomb as soon as the current test is completed.
Control charts 
A control chart is a graphical tool that can help the user determine whether their process is in control. Many standard methods require periodic measurement of a control sample and plotting the results on a graph. Acceptable limits are defined, and the process is assumed to be in control as long as the results remain within these limits. Since the results are expected to be normally distributed within the specified limits, systematic trends or patterns in data plots can also be an early warning of problems. The 6400 Calorimeter provides the user with the ability to instantly plot and view standard results with user-defined warning and control limits.
Laboratory requirements
The calorimeter requires a 99.5% oxygen source, an 80 psi nitrogen or house air source, and deionized water.
Model number:
6400
Tests per hour:
6 - 7
Operator time for the test:
1 minute
Accuracy classification:
0.1% class
Jacket type:
Isoperibol, water jacket
Oxygen filling:
automatic
Filling the bucket:
automatic
Washing bombs:
automatic
Bomb model options:
1138, 250 ml of alloy 20
1138CL, 250 ml G30 alloy
Communication balance:
USB port
Printer communication:
USB port
Network connection:
TCP/IP over Ethernet
Dimensions (cm):
42w x 46d x 51h
6400 Isoperibol Automatic Calorimeter Specifications
Technical specifications:
- Isoperibol calorimeter
- Automatic ladle and jacket filling, as well as vessel filling and rinsing
- Automatic cooling
- 6-7 tests per hour
- Fixed bomb cylinder with removable head for quick sample loading
- The operator's time for the test is 1 minute.
- 0.1% accuracy class instrument
- 0.0001 ?C Temperature resolution
- Sample range 5000 - 8000 calories
- 0.05% linearity within the operating range
- SD memory and TCP/IP network communications
- USB port for balance and printer connection
- Update via the Internet
- Dimensions (inches) 16.5 wide X 15.5 deep X 20.0 high
- Dimensions (cm) 42 width X 40 depth X 51 height
