PRESAIR

Sensitive Differential Switches

Presair’s sensitive differential switches provide accurate low-pressure sensing for applications requiring precise detection at minimal cost. These switches operate within a narrow pressure range of 0.25 to 35 inches of water, making them ideal for systems that require highly sensitive actuation.

Each switch can be configured to sense pressure, vacuum, or the differential between two separate pressure or vacuum sources. These sensitive differential switches support a wide range of industrial, medical, and instrumentation applications where low-pressure responsiveness is critical.

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.

Presair’s sensitive single pole switches function as pressure, vacuum, or differential pressure switches. These switches are available as field adjustable or factory set, with sensing ranges from 0.25 to 35 inches of water.

Designed for pulse-responsive applications, the switches feature slow-make, slow-break actuation and gold-plated silver contacts that support low-level switching currents. Optional adjustable air bleeds can be installed on either side of the diaphragm to support edge detection, bellows, or other pulse-sensing requirements.

Product Specifications

  • Adjustable pressure range: 0.25 – 15 inches of water (factory set options available)
  • SPST (Single Pole Single Throw)
  • Electrical rating: 750 mA @ 250 VAC to 5 mA @ 3 VDC; 1 AMP @ 250 VAC to 5 mA @ 3 VDC
  • UL / cUL recognized for 100,000 cycles

Part Number Configurations

Below is a complete list of part number configurations from the Presair catalog. Click a part number to view detailed product information.

Custom configurations are also available. Contact us with your requirements for additional details.

Common Applications

Presair’s sensitive differential switches are used in medical and industrial applications that require detection of low pressure or vacuum levels.

Industrial

Cross Reference

Presair benchmarks its products against other leading solutions in the market to demonstrate performance, precision & reliability across key specifications.

Find further details by visiting  this link.



BRANDS

PRESAIR

D Series

HERGA

6753 Series

Lefoo

LF31/32

OMEGA ENGINEERING

PSW20 Series

(Obsolete)

Dwyer Instruments

ADPS / EDPS / BDPA

0.25 to 35 inches of water

Max. Operating Pressure = 8 PSI

Adjustable

SPST

750 mA @ 250VAC

UL / cUL Recognized

Made in U.S.A.

Frequently Asked Questions

YOUR QUESTIONS, ANSWERED.

How do I adjust the switch’s set point?

Turn the small hex screw clockwise or counter clockwise to adjust the switch’s set point. See illustrations here.

How do I sense vacuum versus pressure?

The D1000 units come with 2 different air ports. Port B (Normally Open) senses pressure and Port A (Normally Closed) senses vacuum. See an illustration and further explanation here.

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