presair
Adjustable Vacuum Switches
Presair manufactures adjustable vacuum switches engineered to meet the performance, accuracy, and cost requirements of original equipment manufacturers and instrument builders. Each unit is built to exact standards to ensure stable operation and repeatable actuation over time.
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 manufactures adjustable vacuum switches engineered for field-set applications across a wide range of systems. These switches allow users to set actuation points directly in the field to match project-specific requirements. All models are built to precise standards to meet the needs of original equipment manufacturers and instrument builders seeking stable performance, repeatable accuracy, and cost-effective solutions.
These switches provide simple electrical on/off control based on vacuum level. As vacuum increases, one contact opens while the other closes, enabling precise monitoring and control. All models are field adjustable using the hex screw located at the center of the housing. Factory preset configurations are also available.
Dual vacuum switch models are available and can be factory set to operate two separate microswitches at different vacuum thresholds. Multiple body styles and air hose connection options support flexible installation across various applications.
Presair vacuum switches feature a standard deadband of ±10%. Custom deadband settings are available upon request for tighter or wider response tolerances.
Product Specifications
- Adjustable vacuum range: 2.5 inches of water to 300 inches of water
- Proof pressure tested up to 200 PSIG
- SPDT or DPDT contact configurations
- Ratings up to 25A @ 250 VAC
- Gold contact options available
- UL & cUL Recognized
- Variety of mounting and air connection styles available
