Dwyer Omega – Series SA1100 Diaphragm Operated Pressure Switch

Dwyer Omega – Series SA1100 Diaphragm Operated Pressure Switch

The Series SA1100 Diaphragm Operated Pressure Switch is weatherproof and explosion-proof in one economical enclosure. Extremely rugged construction assures excellent reliability in chemical, petroleum and industrial plants. New design also provides burst pressure protection to 3000 psi (206 bar). 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 being used to control liquid level in a tank would be a typical situation where this feature would be important. Both set point and deadband adjustments are protected, yet clearly visible behind a clear polycarbonate window and are 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 drain to meet NEMA 3R IP54.

Wetted Materials

See pressure chamber and diaphragm material in model chart.

Temperature Limits

-30 to 180°F (-35 to 82°C) standard; ATEX compliant at

Ambient Temperature

-4 to 167°F (-20 to 75°C); Process Temperature: -4 to 167°F (-20 to 75°C)

Pressure Limit

1200 psig (82.6 bar)

Enclosure Rating

Weatherproof and Explosion-proof. Listed with UL and CSA for Class I, Groups B, C and D; Class II Groups E, F, and G. ATEX Compliant 2813 II 2 G Ex d IIC T6 Gb Process Temperature 75°C. Weatherproof UL Rated Type 4. Meets NEMA 4X (IP66). EC-Type Certificate KEMA 04ATEX2186 X ATEX Standards: EN 60079-0:2009; EN 60079-1:2007 IECEx Certified for Ex d IIC T6 Gb IEC Standards: IEC 60079-0:2007; IEC 60079-1:2007 IECEx Certificate of Conformity: IECEx DEK 11.0095X

Switch Type

SPDT or DPDT snap switch

Electrical Rating

See model chart

Electrical Connections

Screw terminal

Conduit Connection

3/4˝ female NPT

Process Connection

1/2˝ female NPT

Mounting Orientation

Within 20° of vertical

Set Point Adjustment

Internal 7/16˝ hex nuts

Weight

3.5 lb (1.6 kg)

Compliance

ATEX, CE, CSA, UL