Pressure & Vacuum Switches – Rise/Fall Set Points & Hysteresis

Whether using temperature, pressure, or current, the designation of ON RISE or ON FALL is very important. This is due to switches hysteresis.

To purchase and adjustable pressure or vacuum switch, click here!

Switch Hysteresis – The Difference Between Two Points

Switch Hysteresis

When a switch changes states, from Open to Closed for example, the point at which it resets to Open, or the original state, will not be exactly at the original point. The difference between those two points is the hysteresis.

Example: A pressure switch closes the contact at a set point of 50 psi on pressure rise. The switch does not return to open the contacts until 46 psi when the pressure falls, the hysteresis is 4 psi. If you want that switch to operate at a pressure of 50 psi on pressure Rise it would be set at a different point than if you wanted it to operate at 50 psi pressure Falling. This is why it is important to understand ON RISE and ON FALL and Hysteresis.

Pressure Switch Details 

Presair pressure switches make electrical contact when a certain set pressure has been reached on its input.Field Adjustable Pressure Switch

By providing on/off switching from a pneumatic source, Presair pressure switches deliver critical benefits:

  • Safe and Convenient: Remote operation with complete electrical isolation. UL Recognized.
  • Economical: Costs less than conventional controls
  • Accurate: Highly stable with good repeat accuracy. All switches are 100% tested at high and low settings and at proof pressure.
  • Reliable: Minimal moisture absorption and maximal dimensional stability.

Purchase your pressure switch here!

Vacuum Switch Details 

Vacuum switches can be both adjustable and factory set.

Adjustable Vacuum Switch, Adjustable Pressure SwitchAdjustable vacuum switches have an adjustable range on increasing vacuum of 2.5 inches of water to 300 inches of water. Tinytrol Factory Set Vacuum Switch models can be factory set from 20 inches of water to 300 inches of water.

Vacuum switches are designed and manufactured to exacting standards to meet the needs of original equipment manufacturers and instrument makers for low cost, stable switches and good repeat accuracy.

Purchase your vacuum switch here!

For more information on our pressure and vacuum switches, visit one of the links below!

Adjustable Pressure Switch Monitors Tank 

Adjustable Vacuum Switches: A Cost Friendly Solution to Confirming Vacuum

Contact us


Talk to a product specialist today!

Pneumatic Switches

Presair pneumatic switches are great for safe, economical control of consumer, industrial, medical or other products and appliances in wet, chemical or explosive atmospheres, or just for added safety.

High Quality

All switches are 100% tested with a 100,000+ cycle life.

Made in U.S.A.

Presair switches are designed & manufactured in Eau Claire, Wisconsin, U.S.A.

Call Now