The Dwyer Series SA1100 Diaphragm Operated Pressure Switches are weatherproof and explosion-proof in one economical enclosure. Extremely rugged construction assures excellent reliability in chemical, petroleum, and industrial plants. The new design also provides burst pressure protection to 206bar (3000 psi). The rolling diaphragm design maintains a constant effective area to minimize friction. This results in a minimum deadband as low as 5% of full-scale. Since many applications require higher deadbands, the SA1100 includes a separate adjustment of this when necessary. A pump is used to control a tank’s liquid level would be a typical situation where this feature would be valuable. Both setpoints and deadband adjustments are protected yet clearly visible behind a clear polycarbonate window and fully isolated from the electrical components for additional safety. A 7/16″ open-end wrench is the only tool required to change settings. Terminal blocks are provided for switch wiring connections, and both internal and external ground screws are included. Standard housing is weatherproof to NEMA standards 1 through 4X and 13; explosion-proof to NEMA 7, Class I, Groups B, C & D; NEMA 9, Class II, Groups E, F & G. Optional construction adds a drain to meet NEMA 3R IP54.
Product Applications
- Chemical, petroleum, food, and drug processing industries
- Used indoor, outdoor, or in an explosion-proof area
- Pump control
