humidity strip

humidity strip

[hyü′mid·əd·ē ‚strip]
(engineering)
The humidity transducing element in a Diamond-Hinman radiosonde; it consists of a flat plastic strip bounded by electrodes on two sides and coated with a hygroscopic chemical compound such as lithium chloride; the electrical resistance of this coating is a function of the amount of moisture absorbed from the atmosphere and the temperature of the strip. Also known as electrolytic strip.
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They are wrapped in plastic with two sheets of mount board and wrapped again in an archival box with a humidity strip.