1640系列 用于三位控制的微差壓開關(guān)-德威爾Dwyer
1640系列 用于三位控制的微差壓開關(guān)是在1630系列開關(guān)的基礎(chǔ)上創(chuàng)新出來的微差壓開關(guān),它帶有一個單刀雙擲的浮動觸點開關(guān),能保持開關(guān)在一個中間位置。
示意圖展示了工作原理:當隔膜被差壓推動,它帶動浮點開關(guān)在兩個預(yù)設(shè)點產(chǎn)生動作,如果在預(yù)設(shè)點之間,開關(guān)沒有任何動作。當差壓升高到高預(yù)設(shè)點時,高位開關(guān)關(guān)閉,當差壓降低到低預(yù)設(shè)點時,低位開關(guān)關(guān)閉。
典型的應(yīng)用例子為馬達驅(qū)動的風門,當風管中的靜壓增大到*大預(yù)設(shè)點時,開關(guān)會控制驅(qū)動風門位置變化,當靜壓降低到*小預(yù)設(shè)點時,開關(guān)也會驅(qū)動風門位置表話。如果采用皮托管配合使用,是一樣的道理來控制風速,是供風管保持恒量供風。
注意:只能用于空氣或其它兼容性氣體。
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Temperature Limits: -30 to 110°F (-34.4 to 43.3°C).
Pressure Limits: 10 psig (68.95 kPa) continuous, 25 psig (172.4 kPa) surge.
Switch Type: SPDT.
Electrical Rating: Non-inductive: 2.5 A @ 110 VAC, 1.5 A @ 220 VAC, 1 A @ 24 VDC, 0.5 A @ 110 VAC; Inductive: 1 A @ 110 VAC, 0.5 A @ 220 VAC, 0.5 A @ 24 VDC. (De-rate 70-80% for very slow pressure changes.)
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.
Weight: 4 lb 13 oz (2.18 kg).
Agency Approvals: CE.