Dwyer A3002 壓力開關/儀表

Dwyer A3002 壓力開關/儀表

3合1指示壓力計，低限和高限控制

壓力表前按鈕可調設定點和零值

Photohelic開關/壓力計功能作為通用高度可重復的壓力組合開關結合精密的壓力表采用經過時間考驗差壓計。Photohelic開關/壓力計測量控制空氣和兼容氣體正壓，負壓或差壓。高/低限控制包括兩個光電晶體管驅動，DPDT繼電器。易于調整設定值指標控制旋鈕位于壓力表面上。個人設定死區是一個指針寬度-小于滿量程的1％。設定點可以互鎖提供可變的死區-適用于控制風扇，風門，等。壓力計讀數是持續的，不受開關操作影響，即使失去電源。在典型應用中，這些開關/儀表控制在高低壓集點之間。當壓力變化，達到任一設定點壓力，限制光電晶體管的紅外光由螺旋驅動遮光器被切斷。由此產生的光電晶體管電子信號放大，以驅動其的DPDT隨動繼電器切換發生。接通和斷開之間的死區滿刻度為1％或更少-剛好足以保證積極的無顫動操作。塑料外殼保護所有的電子元件。固態和集成電路電子的玻璃環氧樹脂印刷電路板和自熄端子板。

Photohelic開關/儀表是用來控制空調系統，潔凈室，流體及氣動控制系統中的壓力，材料處理設備，報警或控制排煙系統，在空氣結構控制壓力，和顯示器的呼吸和血壓。

3-in-One Indicating gague, low-limit and high-limit control

set points and zero are easily adjusted on front of gauge

The Photohelic switch/gauge functions as versatile, highly repeatable pressure switches combined with a precise pressure gauge employing the time-proven Magnehelic gauge design. The Photohelic switch/gauge measures and controls positive, negative or differential pressures of air and compatible gases. Two phototransistor actuated, DPDT relays are included for low/high limit control. Easy to adjust setpoint indicators are controlled by knobs located on the gauge face.Individual setpoint deadband is one pointer width - less than 1% of full scale. Setpoints can be interlocked to provide variable deadband - ideal for control of fans, dampers, etc. Gauge reading is continuous and unaffected by switch operation, even during loss of electrical power. In typical applications, these switch/gauges control between high and low pressure set points. When pressure changes, reaching either set point pressure, the infrared light to the limiting phototransistor is cut off by the helix-driven light shutter.The resulting phototransistor signal is electronically amplified to actuate its DPDT slave relay and switching occurs. Dead band between make and break is 1% of full scale or less - just enough to assure positive, chatter-free operation. A plastic housing protects all electronic components. Solid-state and integrated circuit electronics are on glass-epoxy printed circuit boards and self-extinguishing terminal boards.<br><br>

Photohelic switch/gauges are used to control pressures in air conditioning systems, clean rooms, fluidic and pneumatic control systems, materials handling equipment, alarm or control fume exhaust systems, control pressure in air structures, and monitor respiratory and blood pressures.