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Hygrograph (As Per Is: 5900 - 1970)

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The Hygrograph records continuously the relative humidity. In this Hygrograph a well treated bundle of hair is used as humidity sensor. On end of the hair bundle is firmly held is a grip, while the grip at the other end has the facility to vary the initial tension. Approximately at the center, the hair passes through a metallic hook kept under initial tension. Due to their natural property the hair elongates or shrinks with increasing or decreasing humidity respectively. The varying tension on the hook causes its up or down movement, which is amplified through a mechanical linkage to drive a recording pen arm. The pen records relative humidity against the time. The chart is driven by mechanical or quartz clock drum (daily or weekly).

Relative humidity accuracy 5% in range of 20 to 95% rh

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