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. Triggers 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