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.
Wide variety of options available to meet original equipment manufacturers product requirements.
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.
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.
- 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
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 email@example.com.
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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.
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.
We offer a variety of diaphragm material options to meet different application needs.
Here’s a guide to the different options available.
We offer a variety of micro switch options to meet application requirements up to 25 Amps @ 240VAC. Learn more here!
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.
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!
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