Field Adjustable Vacuum Switches

Here at Presair, we’re pleased to provide you with a technical adjustable pressure 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 pressure switches.

Presair adjustable pressure 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.

Competitors such as Tecmark, Herga, and Lefoo offer distinct series of adjustable pressure switches, engineered for specific applications. This article focuses on Tecmark’s 3000, 3900, 4000, VTBS3000, V4000 series, Herga’s 6731, 6732, 6741, and 6742 Series, as well as Lefoo’s LF25 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 pressure switches, our cross-reference guide is designed to streamline your decision-making process, ensuring a precise match for your specific technical requirements.

Adjustable Pressure Switch Cross-Reference

Manufacturer Presair Tecmark Herga Lefoo
Product Name P Series 3000,3900,4000,VTBS3000,V4000 6731, 6732, 6741 & 6742 Series LF25
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 Pressure Rise or Fall Open or Close on Pressure Rise or Fall Open or Close on Pressure Rise or Fall Open or Close on Pressure Rise or Fall
Pressure Range 2.50 inches of water to 125 PSI 2″WC to 100 PSI 1.50 inches of water to 120 PSI 3 psi to 130 [so
Max. Proof Pressure 200 PSI 120 PSI 150 PSI 145 psi
Contact Configuration Single Pole, Single Throw (SPST); Single Pole, Double Throw (SPDT); Double Pole, Double Throw (DPDT) SPST, SPDT, DPST, or DPDT SPST, DPDT SPST OR SPDT
+100,000 Max. Resistive Cycle Rating @120VAC 25 Amps 25 Amps 21A 16A
Certifications UL, cUL RoHS & REACH Compliant UL, cUL RoHS & REACH Compliant UL(508 Specific models only), RoHS & REACH UL, CUL, RoHS  REACH
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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