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Customer Class File Number
Dwyer Instruments, LLC
102 Indiana Hwy 212
Michigan City
Indiana
United States
46360
 3238-01
SWITCHES - Automatic - Pressure Type - For Hazardous Locations
042749_0_000

 

Class I, Groups C and D; Class II, Groups E, F and G; Class III:

Pressure-operated switches, Models 1950-aaa-b-c, 1950P-aaa-b-c, 1951-aaa-b-c and 1952-aaa-b-c, rated 125V ac, 1A, 10A or 15A; 250V ac, 10A or 15A; or 480V ac, 10A or 15A; 1/8 hp, 125V ac, or 1/4 hp, 250V ac; Ambient Temperature Range: -40°C to +60°C; Enclosure Rating: Type 3, as applicable.

where:

aaa = pressure range

00 = 0.07 to 0.15 inch W.C., 45 inch W.C. continuous
0   = 0.15 to 0.5 inch W.C., 45 inch W.C. continuous
02 = 0.03 to 0.10 inch W.C., 45 inch W.C. continuous
1   = 0.4 to 1.6 inch W.C., 45 inch W.C. continuous
2   = 0.5 to 2.0 psi, 35 psi continuous
5   = 1.4 to 5.5 inch W.C., 45 inch continuous
8   = 1.5 to 8.0 psi, 35 psi continuous
10 = 3.0 to 11.0 inch, W.C., 45 inch continuous
15 = 3.0 to 15.0 psi, 35 psi continuous
20 = 4.0 to 20.0 inch W.C., 45 inch continuous
25 = 4.0 to 25.0 psi, 35 psi continuous
50 = 15.0 to 50 psi, 70 psi continuous

b = switch type

               1 = Micro Switch BZ-RW84385-A2
               2 = Micro Switch BZ-RW84414-A2 or BZ-RW84431-A2
               3 = Micro Switch BZ-RW8435118-A2
               4 = Micro Switch BZ-RW8435133-A2
               5 = Micro Switch BZ-RW847222-A2
               6 = Micro Switch BZ-RW847225-A2
               7 = Dwyer Instruments Model A1 A2 or A3
               8 = Dwyer Instruments Model A1G, A2G or A3G

c = diaphragm and “O” ring material

               B = Buna-N diaphragm and "O" rings
               N = Neoprene diaphragms and "O" rings
               S = Silicone diaphragm and "O" rings
               V = Fluoroelastomer diaphragm and "O" rings
               F = Fluorosilicone diaphragm and "O" rings

 

Class I, Groups B, C and D; Class II, Groups E, F and G; Class III:

Pressure operated switches Cat No 1950G-aa-b-ccc-dd, with input rating of 24Vdc/ 3W; 24Vac/ 6W; 120Vac/ 4W; 240Vac/ 11W; Ambient Temperature Range:-40°C to +60°C; Enclosure rating: Type 3.

where

aa = pressure range designation

            00 = 0.07 to 0.15 inch W.C.
            0   = 0.15 to 0.50 inch W.C.
            1   = 0.4 to 1.6 inch W.C.
            5   = 1.4 to 5.5 inch W.C.
            10 = 3 to 11 inch W.C.
            20 = 4 to 20 inch W.C.

b = Diaphram and O-ring material designation

            B = Buna N
            N = Neoprene
            S = Silicone
            V = Fluoroelastomer
            F = Fluorosilicone

ccc = Input voltage supply

         120 = 120 V ac
         240 = 240 V ac
         24   = 24 V dc

 

dd = Approvals

          Blank = UL, CSA, FM, ATEX, IECEx (optional)
          NA = UL, CSA, FM

 

/tk