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Types of Hygrometer

Ancient Hygrometers
Ancient Hygrometers

Ancient hygrometers Edit Prototype hygrometers were devised and developed during the Western Han dynasty in Ancient China to study weather. . The Chinese used a bar of charcoal and a lump of earth: its dry weight was taken and then compared with its damp weight after being exposed in the air.

Chilled Mirror dew Point Hygrometer
Chilled Mirror dew Point Hygrometer

Chilled mirror hygrometers (CMHs) detect dew point by cooling a reflective condensation surface until water begins to condense. The condensed fine water droplets are detected optically by components such as shown here.

Dew Point Hygrometers
Dew Point Hygrometers

In hygrometer Dew-point hygrometers typically consist of a polished metal mirror that is cooled at a constant pressure and constant vapour content until moisture just starts to condense on it. The temperature of the metal at which condensation begins is the dew point.

image: pixshark.com
Hair Tension Hygrometers
Hair Tension Hygrometers

Hair tension hygrometers These devices use a human or animal hair under tension. The hair is hygroscopic (tending toward retaining moisture); its length changes with humidity, and the length change may be magnified by a mechanism and indicated on a dial or scale.

Metal-Paper Coil Type
Metal-Paper Coil Type

Types of hygrometers perform an astonishing range of work in homes, offices, manufacturing plants, hospital environments, research labs, drying processes, food production facilities, incubators, greenhouses, museums and textile and paper industries.

image: packcon.org
Psychrometer (Wet-and-dry-Bulb Thermometer)
Psychrometer (Wet-and-dry-Bulb Thermometer)

Psychrometer (wet- and dry-bulb hygrometer) Hygrometer using evaporative cooling as a measure of humidity. Consists of two thermometers, one of these has a dry bulb, and the bulb of the second is kept wet.

source: npl.co.uk
image: ebay.com
Resistive
Resistive

Resistive Hygrometer. The conducting film of the resistive hygrometer is made by the lithium chloride and the carbon. The conducting film places between the metal electrodes. The resistance of the conducting film varies with the change in the value of humidity present in the surrounding air.

Thermal
Thermal

The hay thermo hygrometer PCE-HMM is a professional device to designed to determine moisture and temperature of pressed hay and straw. The hay thermo hygrometer features a sensor made of stainless steel, which can be purchased in four different lengths, while the wooden handle has an ergonomic design.