產品介紹
A3000系列 Photohelic®微差壓開關/表采用了可靠耐用的Magnehelic®設計理念，把高精度差壓表和高重復性的差壓開關組合在一起。可以測量和控制空氣或其它兼容氣體的正壓，負壓或差壓。標準耐壓等級為25psig(1.7bar)，也可選擇耐壓35psig(2.4bar)或耐壓80psig (5.5bar)。36000S單壓型可以測量到6000 psig (413 bar)且耐壓到9000psig(620bar)。兩個雙刀雙擲的開關用于高/低限位控制。儀表盤面上的旋鈕可很容易調整設定點，每個設定點的回差小于1%，比指針的寬度還窄。采用兩個設定點能夠鎖定出不同的回差，zui適用于控制風機，風門等。差壓表讀數不受開關操作的影響，即使失電也不影響讀數。可選的量程范圍從0-0.25英寸水柱(0-6毫米水柱)到30psi(2.1bar)。
Photohelic的工作原理
當在高低設定點值之間差壓變化，到某一設定點時，聯動的遮光板會遮擋住射向限位晶體管的紅外線光束，這樣晶體管信號被放大而觸發雙刀雙擲開關動作。
特點
采用工程塑料外殼保護所有的電子元件和線路。固態開關和電子元器件固定在環氧樹脂保護的電路板上，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). A36003S – 36010S; 150 psig (10.34 bar). A36020S and higher; 1.2 x full-scale pressure. Temperature Limits: 20 to 120°F. (-6.67 to 48.9°C). Low temperature option available. 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). Weight: 4 lb (1.81 kg).SWITCH SPECIFICATIONS Switch Type: Each setpoint has 2 Form C relays (DPDT). Repeatability: ±1% of FS. Electrical Rating: 10A @ 28 VDC, 10A @ 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. Optional-EXPL explosion-proof enclosure does not possess any agency approvals. |
