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Dwyer Series SA1100 Diaphragm Operated Pressure Switches
  • Weatherproof and Explosion-Proof in One Economical Enclosure
  • Visible Setpoint, Adjustable Deadband, 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 on a minimum deadband as low as 5% of full scale. Since many applications require higher deadbands, the SA1100 includes a seperate 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 setpoint and deadband adjustments are protected, yet clearly visible behind a clear polycarbonate window and are fully isolated from the electrtical components for additional saftey. 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. Daiphragm elements are available in either Buna-N or fluorocarbon for compatibility in many liquid or gas applications. Larger Image | Dimensional Information
APPLICATIONS
Chemical petroleum, food and drug processing industries. Used indoor, outdoor or in explosion-proof area.
PHYSICAL DATA
  • 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)
  • Weather-Proof Rating: NEMA 1 to 4X and 13
  • Explosion-Proof Ratings: NEMA 7, Class 1, Groups B, C & D; NEMA 9, Class ll, Groups E, F & G
  • Process Connection: ¼" (K1) or ½" (K2) NPT(F)
  • Conduit Opening: ¾" NPT(F)
  • Switch Type: 1 or 2 SPDT snap acting
  • Wiring Connections: 3 screw terminals
  • Electrical Ratings: 15 A @ 125/250/480 VAC, 1/8 HP @ 125 VAC, ¼ HP @ 250 VAC, ½ A @ 125 VDC resisitive, ¼ A @ 250 A resistive.
  • Hermetically sealed contacts: Rated 5 A @ 125/250 VAC 5 A resistive @ 30 VDC.
  • Hermetically sealed gold contacts: Rated 1 A @ 125 VAC, 1 A resistive @ 30 VDC
  • Setpoint and Deadband Adjustment: 7/16" hex nuts
  • Housing Material: Copper free, die cast aluminum
  • Finish: Textured gray polyurethane
  • Connection Materials: Aluminum, brass or 316 SS
  • Wetted Materials: Buna-N fluorocarbon, aluminum, brass or 316 SS
  • Position: Within 20° of vertical
  • Weight: 3 ½ lbs. (1.59 kg)
MODELS NUMBERS (stock shown in bold)
Aluminum pressure port* ¼" NPT(F) process connection Buna-N diaphragm and O-ring Model No. 316 SS pressure port ½" NPT(F) process connection fluorocarbon diaphragm and O-ring Model No.
SA1111E-A4-K1
SA1112E-A4-K1
SA1113E-A4-K1		 SA1111E-S5-K2
SA1112E-S5-K2
SA1113E-S5-K2
*Brass pressure port available for water service.
Note: The fifth and sizth characters designate the range of adjustment.
Range
No.		 Operating
Range
(psig/bar)		 Minimum
Deadband (psig/bar)		 Maximum
Deadband
(psig/bar)
Low High
  PSIG BAR PSIG BAR PSIG BAR PSIG BAR
11
12
13 		10-150
20-250
30-500 		0.7-10
1.4-17.2
2.0-34 		4.0
5.0
12 		0.28
0.35
0.83 		7.5
12.5
45 		0.52
0.86
3.1 		75
150
300 		5.2
10
21
 
Options
DPDT Contacts: Change tenth character to L. Example: SA1111E-A4-L1. Approximate minimum deadband increases by 50%
CENELEC Certified Construction: UL, CSA, and CENELEC approved. Add suffix CN. Example SA11111E-A4-K1-CN
Housing with Drain: Allows condinsation to be drained from inside enclosure. Add suffix DR. Example: SA1111E-A4-K1-DR
Switch Options: Replace E in model number. Example: SA1111HS-A4-K1
HS - Hermetically sealed snap switch.
HG - Hermetically sealed snap switch - gold contacts.
Suggested Specification
Pressure switches shall be (UL/CSA) (CENELEC) listed and be diaphragm operated with fully adjustable setpoint. Switch shall have visible setpoint indicator and adjustable deadband protected by clear polycarbonate window. Electrical terminals shall be isolated from setpoint adjustment. Housing shall be weatherproof and explosion-proof, Class I, Groups B, C, & D; Class II, Groups E, F, & G, CENELEC EExd IIC T6 (T amb. = 75°C). Switches shall be Mercoid Model SA11( _ _)E-(_ _)-(_ _)-(_ _).
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