1950系列 防爆型微差壓開關-德威爾Dwyer
1950型防爆差壓開關綜合了1900系列差壓開關的所有性能，再配備防爆或全天候的防護外殼，使其應用更加廣泛，應用價值也更高。它有CE,UL和CSA，FM認證，防爆級別為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)。全天候防護外殼上帶有排水堵頭和O型環密封，打開前蓋板就能很容易接線。可在防護外殼的外面調整設定點。有12種型號供選擇，從0.03＂到220＂英寸水柱（7.5到5000PA）和從0.5到50psi（0.035到3.5Bar）。1950型防爆差壓開關體積小，重量輕，體積和重量相當于其它防爆開關的一半。
警告：只能用于空氣或兼容氣體。當在危險場合和單正壓的情況下使用時，必需進行特殊的通風排氣。
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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