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 |
| Contact Configuration | SPDT, DPDT, SPST | SPST, SPDT, DPST, or DPDT | SPST, DPDT | SPST OR SPDT |
| +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 |
