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Humidity regulations in a restricted environment, such as a metal film memory file, can be accomplished by using a saturated salt contained in a device which allows regulation without contamination.
English (United States)
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Regulation of Humidity in Memory Devices
Humidity regulations in a restricted environment, such as a metal film
memory file, can be accomplished by using a saturated salt contained in a device
which allows regulation without contamination.
Memory files have a "breather" hole through which filtered air is allowed to
exchange back and forth. A constant humidity is not possible in such an
environment. Control of humidity in the laboratory using salt solutions is well
known [*]; however, the technique applied in a memory file is not.
The regulation of humidity in the memory file is done by containing a
saturated salt in a holding cell which does not corrode and is permeable. One
conception of such a device is shown in the figure. Sufficient salt (A) chosen to
provide a specific humidity is put in water (B) to cause saturation. Excess water
can be used to allow regulation in dry environments. The saturated salt is
contained in a non-corroding material (C), such as TEFLON*. A porous filter (D)
of sufficient size to allow water vapor to transfer back and forth, but not liquid or
salt, is essential. The filter should also be non- corroding. A device can be
designed which can operate independent of orientation of the file (E). *
Trademark of E. I. du Pont de Nemours & Co.
Reference: J. F. Young, "Control in the Laboratory Using Salt Solutions-A
Review," J. Appl. Chem. 17, 241-245 (September 1967).
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