Dew point
Temperature , to which the mixture of air and water vapour has to cool down, so that the air is just saturated with the available amount of water vapour, and condensation is starting.
At 15 °C and 50% rel. humidity the dew point is about 5 °C, at 80% rel. humidity about 12 °C, and at a humidity of 100% the dew point corresponds to the current temperature of 15 °C.
At 15 °C and 50% rel. humidity the dew point is about 5 °C, at 80% rel. humidity about 12 °C, and at a humidity of 100% the dew point corresponds to the current temperature of 15 °C.
Measurement element H
Specially prepared human hairs expand under the influence of humidity, thus changing in length. This change in length is a measure of relative humidity. The range of application lies between 10 and 100% rel. humidity in temperatures ranging from -60 ... +70 °C. Hair measurement elements must be regenerated.
Pt 100 Sensor
A temperature sensor with a measurement coil made of platinum wire. The temperature-dependent resistance-change of the platinum wire is used as measure for the temperature. 100 Ω for 0 °C is used as basic value. The resistance-change is defined in the DIN IEC 60751 standard. Pt 100 sensors are applied for ex. in psychro transmitters.