An automatic (or semi-automatic) apparatus for the determination of melting curves

Abstract

A description is given of an apparatus for the determination of heating curves by means of the “thin film” method The amount of substance used is about 500 rng The apparatus permits the automatic recording of heating curves with an accuracy of 0.001°C within a range of 0.2°C By simply resetting a resistance the next following range of 0.2°C may be recorded Larger ranges may be investigated completely automatically, with a temperature sensitivity inversely proportional to the range, however.

The dimensions of the calonmetric part of the apparatus are discussed The thermometers used are platinum resistance thermometers having a resistance of about 600 ohms at room temperature The diameter of the thermometers ia about 6.5 min and their length amounts to 25 mm.

A Scheme of the amplification system for recording the temperature and controlling the heating current is presented

The apparatus may be used from temperatures of from 200°C to far below zero.