美國(guó)* 德威爾dwyer H2系列 防爆壓力開(kāi)關(guān)
防爆和全天候防護(hù)
H2系列 防爆壓力開(kāi)關(guān)為 U.L， CSA Class I, Groups B, C & D和Class II, Groups E, F & G防爆認(rèn)證。用于氣體或者液體。當(dāng)壓力增高或降低時(shí)有兩種不同的開(kāi)關(guān)動(dòng)作。在這個(gè)經(jīng)過(guò)認(rèn)證的設(shè)計(jì)中，一個(gè)隔膜來(lái)驅(qū)動(dòng)兩邊的連動(dòng)的開(kāi)關(guān)，每個(gè)開(kāi)關(guān)都是獨(dú)立動(dòng)作的，它們可以分別調(diào)整來(lái)共同工作。或高低控制，或兩個(gè)中間設(shè)定點(diǎn)值。開(kāi)關(guān)頂部可現(xiàn)場(chǎng)打開(kāi)，方便調(diào)整配置而無(wú)需拆卸接線(xiàn)或過(guò)程連接。Duotect@開(kāi)關(guān)的防護(hù)等級(jí)有防爆和全天候。它可以任意方向安裝且不受振動(dòng)的影響。
Wetted Materials: 316 SS chamber with FEP diaphragm and Buna-N O-ring standard. Fluoroelastomer or EPDM O-ring optional.
Temperature Limit: 275°F (135°C). CSA approved: -20 to 90°C (-4 to 184°F).
Pressure Limit: 1500 psig (103 bar).
Enclosure Rating: UL listed explosion-proof, Class I, Groups B, C, and D. Class II Groups E, F, and G. Meets NEMA 4X (IP66). CSA optional. Class I, Groups B, C & D. Class II, Groups E, F, & G -20°C ≤ Tamb ≤ 75°C T6 [optional -20°C ≤ Tamb ≤ 40°C T5] Type 4.
Switch Type: Two SPDT snap switches.
Electrical Rating: 5 A @ 125/250 VAC, 5 A res., 3 A ind. @ 30 VDC. Gold contacts or 10 A switch optional.
Electrical Connections: 18 AWG, 18" (460 mm) long.
Conduit Connection: 3/4" female NPT.
Process Connection: 1/4" female NPT.
Mounting Orientation: Any position.
Set Point Adjustment: Internal nut.
Weight: 2 lb (.9 kg).
Deadband: Approximay 10% of range.
Agency Approvals: CE, CSA, UL.
