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Ambient temperature variations can also accelerate encoder failure rates. During encoder cool down, pressure differences between the outside environment and housing interior can draw air into the latter.
As the encoders housing temperature drops, contained humidity condenses inside, collecting dew on code disc, printed circuit boards, and wiring - and heightening odds of failure. Finally, without ruggedized sealing, sand, salt, small wood chips, or dust particles can invade standard encoders, blocking optical processes and degrading performance.
Magnetic debris ingress can degrade rotary magnetic encoder performance, but other contaminants do not.