Presair adjustable vacuum switch

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

Presair adjustable vacuum 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.

Competitors such as Tecmark, Herga, and Lefoo offer distinct series of adjustable vacuum switches, engineered for specific applications. This article focuses on Tecmark’s V4000 series, Herga’s HPS-600-V series, as well as Lefoo’s LFS-01 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 adjustable vacuum switches, our cross-reference guide is designed to streamline your decision-making process, ensuring a precise match for your specific technical requirements.

Adjustable Vacuum Switch Cross-Reference

Manufacturer Presair Tecmark Herga Lefoo
Product Name V Series V4000 HPS-600-V LFS-01
Mounting Styles & Air Connections 1/8 NPT, 9/16″-18 UNF Thread Mount w/ 1/8 NPT, 1/4 NPT, Radial Mount with Side Air Spout, Direct Mount with Center Air Spout 1/8” NPT male, 1/4” NPT male, 3/16” barbed, 1/8”, 3/16” or 1/4” compression 1/5″ (5.08mm), 1/8″ BSPT / NPT BRASS NPT 1/8-27 or NPT 1/4-18 male, G 1/8 male
Construction Plastic Plated Steel, Plastic Plastic, Steel, Brass Plastic, Steel Plating
Diaphragm Material Options Nitrile, EPDM, Silicone Nitrile, EPDM Urethane Nitrile, EPDM, FVMQ
Function Open or Close on Vacuum Rise or Fall Open or Close on Vacuum Rise or Fall Open or Close on Vacuum Rise or Fall Open or Close on Vacuum Rise or Fall
Pressure Range .25″WC – 300″WC (-2.5″WC) – 298″WC 1.50 inches of water to 120 PSI 3 psi to 130 [so
Max. Proof Pressure Max Varies Max Varies 407″WC 145 psi
+100,000 Max. Resistive Cycle Rating @120VAC 25 Amps 25 Amps 15 Amps 16A
Certifications UL, cUL, RoHS & REACH UL, cUL RoHS & REACH Compliant UL(508 Specific models only), RoHS & REACH UL, cUL
Country of Origin USA USA 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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