Service:Air and non-combustible, compatible gases.Wetted Materials: Consult factory.Temperature Limits: -40 to 140°F (-40 to60°C); 0 to 140°F (-17.8 to 60°C)for 1950P-8, 15, 25, and 50. -30 to 130°F(-34.4 to 54.4°C) for 1950-02.Pressure Limits: Continuous: 1950’s –45″ w.c. (0.11 bar); 1950P’s – 35 psi (2.41 bar); 1950P-50 only – 70 psi(4.83 bar). Surge: 1950’s – 10 psi (0.69 bar); 1950P’s – 50 psi (3.45 bar);1950P-50 only – 90 psi (6.21 bar).Enclosure Rating: NEMA 3 (IP54), NEMA 7 and9.Switch Type: Single-pole double-throw (SPDT).Electrical Rating: 15 A @ 125, 250, 480 VAC,60 Hz. Resistive 1/8 HP @ 125 VAC, 1/4 HP @ 250 VAC, 60 Hz.Electrical Connections: 3 screw type,common, normally open and normally closed.Process Connections: 1/8″ female NPT.Mounting Orientation: Diaphragm in verticalposition. Consult factory for other position orientations.Set Point Adjustment: Screw type on top ofhousing.Weight: 3.25 lb (1.5 kg); 1950-02 model 4.4lb (2 kg).Agency Approvals: CE, UL, CSA, FM.
Model 1950 Explosion-proof Differential PressureSwitch combines the best features of the popular Dwyer® Series 1900Pressure Switch with an integral explosion-proof and weatherproof housing,making it an exceptional value for either application. It is CE, UL and CSAlisted, FM approved for use in Class I, Div 1, Groups C and D, Class II GroupsE, F, and G and Class III hazardous atmospheres NEMA 7 & 9. Raintight NEMA 3(IP54). Weatherproof features include a drain plug and O-ring seal in cover.Electrical connections are easily made by removing front cover. For conveniencethe set point adjustment screw is located on the outside of the housing. Twelvemodels offer set points from .03 to 20″ w.c. (7.5 to 5 kPa) and from .5 to60 psi (0.035 to 3.5 bar). The unit is very light and compact – about half theweight and bulk of other explosion-proof or weatherproof switches with separateenclosures.
CAUTION: For use only with air orcompatible gases. Applications with hazardous atmospheres and a single positivepressure may require special venting.
| EXAMPLE | 1950 | 02 | 2 | S | AT | Series 1950-02-2S-AT Explosion-proofDifferential Pressure Switch, range 0.03-0.10″ w.c., mica silvercontact micro switch, silicone diaphragm, with aluminum tag. |
| SERIES | 1950 1950P |
Explosion-proof Differential PressureSwitch (for Inches w.c. Ranges) Explosion-proof Differential Pressure Switch (for psid Ranges) |
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| RANGE | 02 00 0 1 5 10 20 2 8 15 25 50 |
0.03-0.10″ w.c. 0.07-0.15″ w.c. 0.15-0.5″ w.c. 0.4-1.6″ w.c. 1.5-5.5″ w.c. 3.0-11.0″ w.c. 4.0-20.0″ w.c. 0.5-2.0 psid 1.5-8.0 psid 3.0-15.0 psid 4.0-25.0 psid 15.0-50.0 psid |
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| MICRO SWITCHTYPE | 2 6 M |
10G Mica Silver Contact 10G Phenolic Gold Contact 10G Phenolic Silver Contact |
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| DIAPHRGMMATERIAL | B F N S V |
Buna-N Fluorosilicone Neoprene Silicone Fluoroelastomer |
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| OPTIONS | AT PRESET ST |
Aluminum Tag Preset Stainless Steel Tag |
