A3000系列 Photohelic 微差壓開(kāi)關(guān)/表-德威爾Dwyer
A3000系列 Photohelic®微差壓開(kāi)關(guān)/表采用了可靠耐用的Magnehelic®設(shè)計(jì)理念，把高精度差壓表和高重復(fù)性的差壓開(kāi)關(guān)組合在一起。可以測(cè)量和控制空氣或其它兼容氣體的正壓，負(fù)壓或差壓。標(biāo)準(zhǔn)耐壓等級(jí)為25psig(1.7bar)，也可選擇耐壓35psig(2.4bar)或耐壓80psig (5.5bar)。36000S單壓型可以測(cè)量到6000 psig (413 bar)且耐壓到9000psig(620bar)。兩個(gè)雙刀雙擲的開(kāi)關(guān)用于高/低限位控制。儀表盤面上的旋鈕可很容易調(diào)整設(shè)定點(diǎn)，每個(gè)設(shè)定點(diǎn)的回差小于1%，比指針的寬度還窄。采用兩個(gè)設(shè)定點(diǎn)能夠鎖定出不同的回差，*適用于控制風(fēng)機(jī)，風(fēng)門等。差壓表讀數(shù)不受開(kāi)關(guān)操作的影響，即使失電也不影響讀數(shù)�？蛇x的量程范圍從0-0.25英寸水柱(0-6毫米水柱)到30psi(2.1bar)。
Photohelic的工作原理
當(dāng)在高低設(shè)定點(diǎn)值之間差壓變化，到某一設(shè)定點(diǎn)時(shí)，聯(lián)動(dòng)的遮光板會(huì)遮擋住射向限位晶體管的紅外線光束，這樣晶體管信號(hào)被放大而觸發(fā)雙刀雙擲開(kāi)關(guān)動(dòng)作。
特點(diǎn)
采用工程塑料外殼保護(hù)所有的電子元件和線路。固態(tài)開(kāi)關(guān)和電子元器件固定在環(huán)氧樹(shù)脂保護(hù)的電路板上，并帶阻燃接線端子排。
GAGE SPECIFICATIONS
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult Factory.
Accuracy: ±2% of FS at 70°F (21.1°C). ±3% on -0 and ±4% on -00 models.
Pressure Limits: -20" Hg. to 25 psig (-0.677 to 1.72 bar). MP option; 35 psig (2.41 bar), HP option; 80 psig (5.52 bar).
Temperature Limits: 20 to 120°F. (-6.67 to 48.9°C). -20 to 120°F (-28 to 48.9°C) with low temperature option.
Process Connections: 1/8" female NPT.
Size: 4" (101.6 mm) dial face, 5" (127 mm) O.D. x 8-1/4" (209.55 mm).
SWITCH SPECIFICATIONS
Switch Type: Each setpoint has 2 Form C relays (DPDT).
Repeatability: ±1% of FS.
Electrical Rating: 10 A @ 28 VDC, 10 A @ 120, 240 VAC.
Electrical Connections: Screw terminals. Use 167°F (75°C) copper conductors only.
Power Requirements: 120 VAC, 50/60 Hz; 240 VAC & 24 VAC power optional.
Mounting Orientation: Diaphragm in vertical position. Consult factory for other position orientations.
Set Point Adjustment: Adjustable knobs on face.
Agency Approvals: CE, CSA, UL.
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