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Mercoid - div. of Dwyer InstrumentsSA1100 Explosion Proof Pressure Switch

Mercoid SA1100 Explosion Proof Pressure Switch
  • Weatherproof and Explosion-Proof in One Economical Enclosure
  • Visible Set Point
  • Adjustable Deadband
  • Optional Hermetically Sealed Snap Switch

    • 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 dead band as low as 5%, of full scale. Since many applications require higher dead bands, 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 dead band 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 or Cenelec Eexd IIC T6 (T amb.= 75°C); is UL/CSA listed and Cenelec certified to IP56. Optional construction adds drain to meet IP54. Diaphragm elements are available in either Buna-N or fluorocarbon for compatibility in many liquid or gas applications.
    APPLICATIONS
    Chemical, petroleum, food and drug processing industries. Used indoor, outdoor or in explosion proof area. Machine tools, high vibration locations.

    Specifications

    Temperature Limits: -30 to 180°F (-35 to 82°C)
    Maximum Operating Pressure: 1200 psig (82.6 bar)
    Maximum Pressure Without Bursting: 3000 psig (206 bar)
    Process Connection: 1/4" (K1) or 1/2" (K2) NPTF
    Conduit Opening: 3/4" NPTF
    Switch Type: 1 or 2 SPDT snap acting
    Wiring Connections: 3 screw terminals
    Standard Switch Electrical Ratings: 15 A @ 125/250/480 VAC, 1/8 HP @ 125 VAC, 1/4 HP @ 250 VAC, 1/2 A @ 125 VDC resistive, 1/4 A @ 250 VDC resistive.
    Optional Hermetically sealed contacts: Rated 3 A @ 125/250 VAC, 3 A resistive @ 30 VDC.
    Optional Hermetically sealed gold contacts: Rated 1 A @ 125 VAC,1 A resistive @ 30 VDC.
    Setpoint Adjustment: 7/16" hex nut
    Housing Material: Copper free, die cast aluminum
    Finish: Textured gray polyurethane
    Connection Material: Aluminum, brass or 316 stainless steel
    Wetted Materials: Buna-N, fluorocarbon, aluminum, brass or 316 SS
    Weight: 3½ lbs. (1.59 kg)
    Mounting Position: Within 20° of vertical
    SA1100 Dimensional Drawing

    Part Numbers

    Part Number
    Aluminum Pressure Port
    1/4" NPTF Connection
    Buna-N Diaphragm & O Ring    		 Part Number
    316SS Pressure Port
    1/2" NPTF Connection
    Fluorcarbon Diaphragm and O Ring    		 Adjustable Set Point
    Range (PSIG)    		 Approximate Minimum
    Deadband
    PSIG
     
    At Low Set Point At High Set Point
    		Approximate Maximum Deadband
    PSIG
    SA1111E-A4-K1
    SA1112E-A4-K1
    SA1113E-A4-K1    		 SA1111E-S5-K2
    SA1112E-S5-K2
    SA1113E-S5-K2    		 10-150
    20-250
    30-500
    4.0
    5.0
    12    		 7.5
    12.5
    45
    		75
    150
    300

    Options

    DPDT Contacts: Change tenth character to L. Example: SA1111E-A4-L1
    (Approximate minimum deadband increases by 50%
    CENELEC Certified Construction: Add suffix -CN
    Housing with Drain: Add suffix -DR
    Hermetically Sealed Snap Switch: Replace E in model number with HS. Example: SA1111HS-A4-K1
    Hermetically Sealed Snap Switch - Gold Contacts: Replace E in model number with HG.

    Contact Us!

    John Sherman Agencies Ltd.
    1641 Venables Street
    Vancouver, British Columbia, Canada
    V5L 2H1

    Phone: 604-254-9622
    Fax: 604-254-3123

    e-mail: info@johnsherman.com