H3系列 防爆型微差壓開關(guān)-德威爾Dwyer
H3系列 防爆式差壓開關(guān)結(jié)構(gòu)牢固，可靠耐用，專利的獨(dú)特設(shè)計(jì)使其能夠靈敏地監(jiān)測(cè)低到10英寸水柱（254毫米水柱）的差壓，同時(shí)承受到1500psig（103bar）的靜壓。它和其它活塞移動(dòng)的壓力開關(guān)不一樣，H3系列采用旋轉(zhuǎn)運(yùn)動(dòng)移動(dòng)軸來使設(shè)定點(diǎn)不隨全壓的變化而變化，回差大約為量程的5%。量程彈簧直接和隔膜向連結(jié)使摩擦阻力減少到*小，重復(fù)精度*佳。轉(zhuǎn)動(dòng)的大隔膜設(shè)計(jì)能夠維持有效面積進(jìn)一步降低摩檫力。隔膜后面有墊座，這樣不管是高壓側(cè)還是低壓側(cè)，在靜壓高到1500psi (103 bar)內(nèi)都不會(huì)受到損害。特別的過量程保護(hù)功能還可以防止過度調(diào)緊量程螺絲�？蛇x擇316不銹鋼外殼用于水，水基液體或用于其它惡劣的應(yīng)用場(chǎng)合。
Wetted Materials: See Ordering page.
Temperature Limit: -4 to 220°F (-20 to 104°C). ATEX: -4 to 194°F (-20 to 90°C).
Pressure Limit: 1500 psig (103 bar).
Enclosure Rating: Standard meets NEMA 4X (IP56); Drain option meets NEMA 3 (IP54). For hazardous use see "Hazardous Location Ratings Chart" on Catalog page.
Switch Type: SPDT or DPDT snap switch.
Electrical Rating: 5 A @ 125/250 VAC, 30 VDC.
Electrical Connections: See Ordering page.
Conduit Connection: 3/4" female NPT.
Process Connection: 1/8" female NPT.
Mounting Orientation: Vertical.
Set Point Adjustment: Internal screw.
Weight: 4 lb 2 oz (2 kg).
Deadband: Approximately 5% of range.
Agency Approvals: ATEX (see "Ratings Chart" on catalog page), CE, CSA, UL.
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