A thermohygrograph (also called a thermo-hygrograph) is a combined recording device for simultaneously measuring and recording temperature and relative humidity. The individual devices are the thermograph and the hygrograph. Thermohygrographs are primarily used in meteorology for weather stations, but are also used in museums, building services, storage, and transportation. Classic models are drum recorders with natural hair, bimetal, and a mechanical or electronic clockwork. The drum can have a rotation period of between one and 31 days. The measured values are recorded as measurement curves on paper.
The main features of the thermohygrograph are:
U-shaped bimetal
natural hair
Measuring range -35...+45 °C / 0...100 rF or *
Measuring range -15...+65 °C / 0...100 rF *
Measurement accuracy according to DIN (± 0.5 K ± 3 % rH)
