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.

Applications

The ability of the 6725 Calorimeter to produce complete combustion and a measurable temperature rise with small samples in the 25 to 200 mg range makes this an excellent instrument for use in marine biology and related ecological studies where only limited amounts of sample are available. It also can be used for testing a variety of heat powders and pyrotechnic mixtures, particularly slow burning thermite types which are used to produce heat. Samples which contain their own oxidizers can be burned in an inert atmosphere, while others can be burned in oxygen.

Thermal Jacket

In the 6725 Calorimeter, the heat leak is precisely measured during the calorimetric pre‑period. The associated 6772 Thermometer calculates an effective, average temperature of the calorimeter surroundings. This temperature value is then used throughout the test providing the calorimeter heat leak correction. Effective static thermal insulation is provided by using a silvered glass Dewar flask. This vacuum flask holds the semimicro bomb in the test water.

Data Collection

The 6772 Calorimetric Thermometer is incorporated into the 6725 Semimicro Calorimeter. This allows the user to print to an attached printer, obtain weights from a balance, and transfer data to a computer. Additionally, the ability of the 6772 Calorimetric Thermometer to act as a data logger is very useful when studying materials with very small energy changes.

1109A Semimicro Oxygen Bomb

This is a 22 mL bomb designed for use in the 6725 Semimicro Calorimeter and earlier series 1425 Calorimeters. It is intended for samples ranging from 25 to 200 milligrams, liberating up to 1200 calories. It is also used for heat powders that are self oxidizing and release less than 2400 calories per charge.

High Strength Option

The 1109X High Strength Semimicro Oxygen Combustion Bomb is also available for use in the 6725 Calorimeter. The 1109X is similar in most aspects as the 1109A Vessel but has been specially strengthened to be suitable for testing energetic materials and it is optimized for the measurement of small energy releases.