The built-in piston is connected to a precision spring. When pressure changes, the spring's extension or contraction varies accordingly. Once the set pressure reaches the preset value, it triggers a predefined mechanical structure and sends a switch signal.

Compact in structure, it adopts a DN standard plug for extremely convenient wiring and offers a wide measurement range (0.02-40MPa). Overload capacity can reach up to 80MPa, with high repeatability, specific normally open or normally closed contacts, gold-plated contacts, and large contact capacity. It can be used for measuring the pressure of water, oil, and gas.