What is a double contact pressure switch
Two-contact pressure switch four lines is actually two groups of normally open contacts, a group for the pump, the other group for the module feedback.
Use the environment is different.
Double contact for the need to output two contacts of the occasion, for example: 1 pay point for control, a contact for the signal.
With a pressure switch with a normally open or normally closed contact output
Upstairs is right, the double contact pressure switch is equivalent to two pressure switches in series or parallel. In the actual control, the double contact is better than the single point of stability.
