PRESAIR

Adjustable Pressure Switches

Presair is a leading manufacturer of adjustable pressure switches. Our field adjustable pressure switches allow our customers the flexibility of easily setting the switch parameters in the field as driven by the needs of the project. Pressure 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

mae in u.s.a.

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

Presair is a leading manufacturer of adjustable pressure switches. Our field adjustable pressure switches allow our customers the flexibility of easily setting the switch parameters in the field as driven by the needs of the project. Pressure 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 pressure 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 pressure settings. These switches come in multiple body styles, providing the necessary versatility for air hose connections.

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

Pressure switches can be adjusted by rotating the hex screw located at the center of the pressure switch.

  • Variety of mounting options
  • Adjustable Pressure Range of 2.50 inches of water to 125 PSIG
  • Proof Pressure Tested Up to 200 PSIG
  • SPDT or DPDT
  • Ratings up to 25A @ 250VAC; Gold Contacts Available
  • UL & cUL Recognized


Mounting Options & Air Connections

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

Click 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″ I.D. Center Air Spout
Radial Mount with 1/8″ I.D. Side Air Spout
9/16″ Threaded Mount with 1/8″ I.D. Center Air Spout
Direct Mount with 1/8″ I.D. Center Air Spout
1/8″ NPT Only

Common Applications

Presair’s adjustable pressure switches are commonly found in pool & spa, medical, and industrial applications for simple on/off control of equipment.

Pool & Spa
Industrial

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

P Series

HERGA

6741 & 6742 Series

TECMARK

3000 Series

Omega Engineering

PSW21 & PSW22 Series

(Obsolete)

LEFOO

LF25 Series

2.5 inches of water – 125 PSI

Max. Operating Pressure = 200 PSI

Multiple Mounting Options & Air Connections

Rated up to 25 Amps @ 250VAC

SPDT

DPDT

UL/cUL Recognized

Made in U.S.A.

Frequently Asked Questions

YOU’RE QUESTIONS, ANSWERED.

How do I adjust my pressure switch?

There is a hex screw for adjustment. Turn clockwise or counterclockwise to set the switch at your desired pressure point. Click here for more information.

Can I get my pressure switch factory set?

Yes! We can factory set your pressure switch to your desired set point if you choose with both our Tinytrol Pressure Switches that have a smaller, compact design up to 65 PSI, and our adjustable pressure switches are also available as a fixed option up to 125 PSI.

My application will expose the pressure 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 has a small or large amount of current. What are the pressure 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 PSI rising / falling?

Pressure switches are measured by inches of water, or PSI. 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!

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