Many of Presair’s vacuum switches are field adjustable. This allows you to adjust the point of actuation to the exact vacuum setting you require for your application. It can be done on the fly wherever the adjustable switch is placed.

**Notice – the direction you adjust the set screw is opposite for the below models. Follow these instructions for adjusting your vacuum switch:

WARNING! Do not tighten the screw too far in clockwise. Going beyond the limits may prevent switch operation.

Adjustable Vacuum Switch

Your adjustable vacuum switch comes preset at the low end of the desired vacuum range. To adjust your switch’s actuation point, follow these simple instructions:

  • Insert a small hex driver into the screw pictured.
  • Tighten or loosen the screw until you reach the desired set point. Tighten clockwise to increase vacuum; loosen counter-clockwise to decrease vacuum.

How To Adjust Vacuum

Adjustable Pressure Vacuum Switch Description

Presair is a leading manufacturer of adjustable vacuum switches. 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. Browse our standard adjustable vacuum switch options.

Our field adjustable vacuum switches allow our customers the flexibility of easily setting the switch parameters in the field as driven by the needs of the project. Adjustable vacuum switches span the range on increasing vacuum of 2.5 inches of water gauge to 300 inches of water gauge. Vacuum switches can be adjusted by rotating the hex screw located at the center of the vacuum switch. Available in a variety of air connections, mountings and electrical ratings.

How to Buy online

Adjustable Sensitive Differential Switch

Your adjustable differential switch comes preset at the middle of its vacuum range. To adjust the switch’s actuation point, follow these instructions:

  • Insert a small hex driver into the screw pictured.
  • Tighten or loosen the screw until you reach the desired set point. Tighten clockwise to decrease vacuum; loosen counter-clockwise to switch at increase vacuum.

How to Adjust Sensitive Pressure Switches

Adjustable Sensitive Differential Switch Description 

Sensitive pressure, vacuum or differential switching. These sensitive single pole switches can be used as pressure or vacuum switches, or as differential pressure switches. The switch can respond to rapid pulsing and the gold plated silver contacts will handle low level switching currents. Adjustable air bleeds can be supplied on either side of the diaphragm for pulse sensing applications involving safe edges or bellows.

How to Buy online

For more information, view our product pages. As always, our support team is ready to help! Contact us with any questions or concerns regarding your switch!

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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

Presair switches are 100% testing before leaving our facilities.

Made in U.S.A.

Products are designed & manufactured in Eau Claire, Wisconsin, USA.

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