The most important customer requirements for an instrument display are: durable, robust, and good readability of the active pressure even from a distance of up to 3 m, even in poor light conditions.
Red LED displays are still the most widely used technology in the industrial environment. Self-hating of LED technology in my opinion still in favour are the following:
High brightness
Good contrast
Long life
Mechanically robust
Low current consumption (low intrinsic heating)
Wide temperature range
In addition, in the WIKA pressure switch PSD-30, particular attention was paid to the following items, in order to guarantee optimum readability even in poor light conditions:
Particularly large character size
Even illumination of the individual segments
Special contrast enhancement display filter