Features

• membrane, piston or bellows
• up to 525 bars (7600 psi)
• Integrated electronics for signal processing and complex functions available
• Provide very precise, accurate set points
• Vibration tests pass easily with our unique and robust designs
• Catalog valves can usually be adapted easily to meet special requirements

 

Two Ranges of Pressure Switches

Relative Pressure Switches

• Relative pressure against atmospheric pressure.

Assemblies can include other devices, such as:

• Provide the relative pressure between two points.
  • If both operating pressures are the same, the measuring element cannot move and no pressure will be indicated.
• Indicated when one pressure is higher or lower.

Absolute Pressure Switches

• Operate at the same settings above zero pressure despite atmospheric pressure changes
• Where pressures are measured independently of the natural fluctuations in atmospheric pressure. The pressure of the media to be measured is compared against a reference pressure of absolute zero (absolute vacuum) in a sealed reference chamber.

Three Primary Sensor Technologies

Bellow Pressure Switches: Simple and Light

• Uses axial deformation of a metallic bellow under the effect of pressure
• Use controlled by limits of bellows and vibration effects
• Use only for low and medium pressures

Diaphragm Pressure Switches: Strength and Accuracy

• Legacy-proven pressure switch
• Diaphragm deforms under pressure and transmits the movement to a micro-switch via piston
• Deformation must remain small (0.1 to 0.2 mm) to stay within the elastic envelope of the diaphragm; movement must be amplified
• Strength comes from diaphragm movement being limited by stationary switch, enabling it to withstand higher pressures

Piston Pressure Switches: A Simple Solution for High Pressures

• Includes piston with dynamic seals that moves under pressure
• Withstands very high pressures
• Performance limited by hysteresis created by the friction of piston seals; mainly at low temperatures