Used to measure the enthalpy of reaction when burning solid or liquid substances. The unit is made principally of glass. The lower section of the calorimeter is equipped with a glass inlet nipple for continuous supply of oxygen, the holder for the porcelain crucible with the product being oxidised, and the electrical lead for the incandescent wire coil required for ignition. The course of the reaction can be observed from the outside through the glass section, thus allowing for continuous control. The hot combustion gases are cooled in the double-helical heat exchanger, warming the calorimeter liquid (e.g. water) by several Kelvin. The double-helical design of the heat exchanger minimises the amount of heat lost in the form of residual heat in the combustion gases. This calorimeter is suitable not only for determining the molar combustion enthalpy of chemically defined compounds; it is just as good for measuring the calorific value of foods. There are two incandescent filaments of differing diameters available, the choice depending on the ignition temperature and incineration period for the material being tested. Replacement parts for calorimeter
667 325:
667 324, ignition coils , set of 2
