The 1341 Calorimeter is an improved version of a plain, static jacket, oxygen bomb calorimeter that has been made by Parr for more than eighty years. It is a reliable calorimeter that can be used for the same broad range of solid and liquid combustible samples as the 1266, 1271, 1281 and 1356 models. Its modest cost and simple design recommend it primarily for users whose work load does not justify the purchase of an automatic model. The calorimeter requires no permanent connections. It can be set up and ready to operate in a few minutes and, when not in use, can be disassembled easily and stores on a shelf.
MANY APPLICATIONS
The calorific value of any solid or liquid material that can be burned safely in an oxygen bomb can be determined in the 1341 Calorimeter. It is also an excellent instrument for teaching heat measurement techniques in a student laboratory since it provides all of the instrumentation needed for such tests, but with each element in the system reduced to fundamental forms. Although commonly called a 'plain' calorimeter because of its simple design, technically this is a static jacket instrument which operates at or near room temperature with no provision for controlling the jacket temperature. Compensation for any heat loss (or gain) during a test is made by applying a correction computed from heat leak measurements taken before and after each test. As a general rule, about 10 or 12 tests can be completed in an 8-hour day, whereas up to 75 tests can be run in the same period in a Parr automatic model.
GOOD REPEATABILITY
Good repeatability can be obtained with the 1341 Calorimeter provided that the temperature rise and heat leak corrections are measured and applied carefully. Using the 19-35°C thermometer supplied with the instrument, standard deviations in a series of tests with a uniform sample such as benzoic acid should not exceed 0.3%. This repeatability can be improved by substituting a shorter range thermometer (Parr 1621 or 1623), or reduced to 0.2% by using the Parr 1672 Electronic Thermometer.
QUALITY CONSTRUCTION
There has been no compromise with quality in selecting components for the moderately priced, 1341 Calorimeter. It is equipped with the same 1108 Oxygen Bomb furnished with the 1266 Isoperibol Calorimeter. An alternate 1108CL bomb with superior resistance to chlorine and halogen acids is available for tests involving waste materials and chlorinated solvents. The molded double wall jacket provides a simple yet effective insulating system that restricts heat flow between the calorimeter and its surroundings. Temperature readings are taken with a 1604 Calorimetric Thermometer with a range from 19-35°C in .02° subdivisions. Readings can be estimated to the nearest .002° using the clip-on reading lens furnished with the instrument.
ORDERING GUIDE
1341 PLAIN CALORIMETER
The 1341 Calorimeter is furnished with an 1825 Oxygen Filling Connection, six fuel capsules, fuse wire for 1500 tests and support stands for the bomb head and calorimeter cover, also a vial of benzoic acid pellets for standardizing the calorimeter and complete operating instructions.
ACCESSORIES
The 2901 Ignition Unit is offered to provide low voltage electrical current to fire the oxygen bomb. An alternate ignition unit, 2902, is offered for use with calorimeters equipped with the 1672 Calorimetric Thermometer. The 2902 includes provisions for automatically firing the bomb under the control of the 1672 Thermometer/Controller.
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