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.
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Switch Hysteresis – The Difference Between Two Points
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.
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.
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Vacuum Switch Details
Vacuum switches can be both adjustable and factory set.
Adjustable 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.
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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
