The Pressure Switch device has been designed to meet different air-lock systems, to guarantee a specific safety position of actuators, as required by the final control element. This item is mounted on pneumatic actuators when they are to be isolated from control devices (positioners, electro-pneumatic distributors, etc.) whenever air pressure falls below operating safety point. Switching device operates immediately, also in case of a gradual air-pressure decrease to the set value.
There are available models with square plate (fig.3) and threaded connection (fig. 4).