The pressure switch functions on the basis of the
piston-spring principle. The microswitch (2) is
actuated if the pressure lies below the configured
value. The piston (6) acts against the spring plate
(5) when pressure builds up. This braces itself
against the continuously-adjustable compression
spring (4). The piston (6) transfers the force of
onto the spring plate (5) when the configured
pressure is reached on the nozzle (7), enabling the
microswitch (2) and triggering an electrical signal.
The pressure to be monitored is determined by the
preload tension of the spring (4). Adjustment is
achieved by turning the adjusting element (3).
Anticlockwise rotation reduces the switching
pressure, while turning in a clockwise direction
increases the switching pressure. The adjusting
element (3) is fixed with the securing screw. A
mechanical stop prevents the compression spring
(4) from seizing due to excessive turning.