Adjustable Vacuum Switches

presair

Adjustable Vacuum Switches

Presair is a leading manufacturer of adjustable vacuum switches. Vacuum switches are designed & manufactured to exacting standards to meet the needs of original equipment manufacturers & instrument makers for low cost, stable switches & good repeat accuracy.

custom options

Wide variety of options available to meet original equipment manufacturers product requirements.

high quality

Highly stable with good repeat accuracy. All switches are 100% tested at high & low settings, & at proof pressure.

safe & economical

Remote operation with complete electrical isolation. UL Recognized. Costs less than conventional controls

made in u.s.a.

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

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Product Details Part Numbers Mounting Options Common Applications Cross Reference Frequently Asked Questions Request A Quote

Presair is a leading manufacturer of adjustable vacuum switches. 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. Vacuum switches are designed & manufactured to exacting standards to meet the needs of original equipment manufacturers & instrument makers for low cost, stable switches & good repeat accuracy.

These switches allow for simple electrical on/off control over pressures. As vacuum goes up, one contact opens as the other closes. This provides a perfect solution for monitoring, controlling, & notifying. All are field adjustable, but can be preset at the factory, if preferred. Dual switches are also available, factory set to operate two separate microswitches at different vacuum settings. These switches come in multiple body styles, providing the necessary versatility for air hose connections.

Presair manufactures vacuum switches with accuracy in mind. Our vacuum switches have a deadband of ±10%, & custom options can be built for a tighter or wider deadband.

Vacuum switches can be adjusted by rotating the hex screw located at the center of the vacuum switch.

Product Specifications

  • Variety of mounting options
  • Adjustable Vacuum Range of 2.50 inches of water to 300 inches of water.
  • Proof Pressure Tested Up to 200 PSIG
  • SPDT or DPDT
  • Ratings up to 25A @ 250VAC; Gold Contacts Available
  • UL & cUL Recognized


View datasheet

Part Number Configurations

Here is a complete list of part number configurations already listed in our catalog. Click on a part number below for more information.

Other custom part number options are available. Please contact us with your requirements for more information.


Mounting Options & Air Connections

Presair switches have a variety of mounting options & air connections available to meet the needs of original equipment manufactures.

Click on one of our readily available solutions below, or send a request for a custom option to info@senasys.com.
1/8 NPT – 9/16″ Threaded Mount with 1/8″ O.D. Center Air Spout
9/16″ Threaded Mount with 1/8″ O.D. Center Air Spout
Radial Mount with 1/8″ O.D. Side Air Spout
Direct Mount with 1/8″ O.D. Center Air Spout
1/8 NPT Only

Common Applications

Presair’s adjustable vacuum switches are commonly found in pool & spa, medical, & industrial applications.

Pool or Spa Air Switch
Pool & Spa
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diaphragm switch for ventilator
Medical
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counter pressure canning line
Industrial
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Cross Reference

We are certain of our position at the top so we’re comparing our product with other top products in the marketplace today.

Find further details by visiting  this link.



BRANDS

PRESAIR

HERGA

TECMARK

Adjustable Vacuum Range = 2.5 – 300 inches of water

Multiple Mounting Options & Air Connections

SPDT Contact Configurations

DPDT Contact Configurations

Rated up to 25 Amps @ 250VAC

UL / cUL Recognized

Made in U.S.A.

Frequently Asked Questions

YOUR QUESTIONS, ANSWERED.

How do I adjust my vacuum switch?

There is a small hex screw located at the bottom of the switch. Turn this screw clockwise or counter clockwise to adjust.

Click here for an illustration.

My application will expose the vacuum switch to hazardous chemicals and/or gases. How will this affect the switch’s performance?

We offer a variety of diaphragm material options to meet different application needs. 

Here’s a guide to the different options available.

My application will expose the plastic of the switch to a hazardous chemical and/or gas. How will this affect the switch?

We offer a protective switch cover for these environments. See how it works here!

My application has a small or large amount of current. What are the vacuum switch ratings?

We offer a variety of micro switch options to meet application requirements up to 25 Amps @ 240VAC. Learn more  here!

What do you mean by inches of water rising / falling?

Vacuum switches are measured by inches of water, or inches of mercury. Once the switch rises or falls the contacts will open and close based on the hysteresis, or deadband.

Read a more detailed explanation here.

What’s the difference between a pressure and vacuum switch?

Pressure switches push against the diaphragm & plunger inside the switch versus a vacuum switch pulls the diaphragm away from the plunger inside the switch. Another way to think of vacuum switches is a negative pressure switch. Here’s an illustration to help!

I’m currently using another manufacturer’s vacuum switch. Will yours work?

Very likely. Check out our cross reference guide here.

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