A New Method of Converting Platinum Resistance Values to Degrees Centigrade

Values of temperature in degrees C are conveniently derived from values of resistance of a platinum resistance thermometer by means of a table of temperature vs resistance. Since each thermometer has its own fundamental constants, it becomes laborious to prepare separate tables for different thermometers. This labor may be avoided by the method outlined. The method is to interpolate from a single ``standard'' table, applying corrections which have been worked out in a reasonably compact form to use the constants of each particular thermometer. A standard table and its correction table are given and were calculated by a rapid method which is outlined. A graph is the most convenient form for the corrections to this standard table. The procedure for making these corrections is discussed. In addition a graphical means of conversion is discussed, which is accurate to 0.01°C and is very convenient and rapid where this accuracy is adequate.