Differential Pressure Transmitter Switch

Here at Presair, we’re pleased to provide you with a technical differential pressure switch cross-reference guide. This guide is designed to assist you in comparing our products with those of notable competitors Lefoo, Herga, and Dwyer Instruments. Click here to learn more about our line of differential pressure switches.

Presair Differential Pressure Switches are field adjustable or can be factory set from 0.25 inches of water to 35 inches of water. The switches can respond to rapid pulsing & their gold-plated silver contacts will handle low level switching currents. These “slow make, slow break” switches can respond to rapid pulsing & the gold plated silver contacts will handle low level switching currents. Optional adjustable air bleeds can be supplied on either side of the diaphragm for pulse-sensing application safe edges or bellows.

This article focuses on Lefoo’s LF31/32 series, Herga’s 6753 series, and Dwyer Instruments’ ADPS, EDPS, AND BDPA series. If you currently utilize one of these series and are exploring alternatives or seeking a precise cross-reference, this guide is tailored to you. Whether you’re an experienced technical professional or navigating the technical details of sequencing air switches, our cross-reference guide is designed to streamline your decision-making process, ensuring a precise match for your specific technical requirements.

You will notice in comparison Presair’s differential pressure switch is a more compact solution compared to Lefoo and Dwyer Instruments, while maintaining the same precision. At Presair we have the ability to provide other custom solutions to meet your application requirements, and strive to maintain a 1-2 week lead time.

Differential Pressure Switch Cross-Reference

Manufacturer Presair Lefoo Herga Dwyer Instruments
Product Name D1000 SERIES LF31/32 6753 ADPS / EDPS / BDPA
Mounting Styles & Air Connections

3mm body molded mount holes, 3.8mm air entry 4 Molded Screw Holes / side mount spouts 0.4mm spout, screw through mount holes in molded body 5/16:OD Tubing, 1/4″ID tubing, push through screw terminals
Construction Plastic Plastic Thermoplastic Plastic
Diaphragm Material Options EPDM Silicone Neoprene Silicone
Function Open or close on Rise / Fall of Pressure or Vacuum Open or Close on Rise / Fall of Pressure or Vacuum  Open or Close on Rise / Fall of Pressure or Vacuum  Open or Close on Rise / Fall of Pressure or Vacuum Pressure
Pressure Range 0.25WC – 35WC 0.15WC – 34WC 2.25WC – 14 WC 0.8WC – 20WC
Max. Proof Pressure 250WC N/A 14.5 PSI 40 WC
Contact Configuration SPST SPST SPDT SPST SPDT
+100,000 Max. Resistive Cycle Rating @250VAC 750mA 1.5A 0.5A 1.5A
Certifications UL, cUL UL, cUL, CE UL, cUL UL, cUL
Country of Origin USA China UK China


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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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