1950系列 防爆型微差压开关-德威尔Dwyer
1950型防爆差压开关综合了1900系列差压开关的所有性能，再配备防爆或全天候的防护外壳，使其应用更加广泛，应用价值也更高。它有CE,UL和CSA，FM认证，防爆级别为Class I, Div 1, Groups C and D, Class II Groups E, F, and G and Class III hazardous atmospheres NEMA 7 & 9. Raintight NEMA 3 (IP54)。全天候防护外壳上带有排水堵头和O型环密封，打开前盖板就能很容易接线。可在防护外壳的外面调整设定点。有12种型号供选择，从0.03＂到220＂英寸水柱（7.5到5000PA）和从0.5到50psi（0.035到3.5Bar）。1950型防爆差压开关体积小，重量轻，体积和重量相当于其它防爆开关的一半。
警告：只能用于空气或兼容气体。当在危险场合和单正压的情况下使用时，必需进行特殊的通风排气。
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Temperature Limits: -40 to 140°F (-40 to 60°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 and 9.
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 vertical position. Consult factory for other position orientations.
Set Point Adjustment: Screw type on top of housing.
Weight: 3.25 lb (1.5 kg); 1950-02 model 4.4 lb (2 kg).
Agency Approvals: CE, CSA, FM, UL.
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