The series of pressure switches are made based on the theory that an inside reversible stainless steel motion diaphragm turns over when inducing a certain pressure. The electric contact (H) opens and electric contact (L) closes simultaneously when the diaphragm moves. When the system pressure reduces, the diaphragm resets instantly, with the function of which, the electric contact
disconnects from contact (L) and connects with contact (H) automatically.
