周晓Slide 111/5/2016音叉式限位开关周晓物位产品经理Endress+Hauser China周晓Slide 211/5/2016s/cs/c上海销售中心地址:上海市田林路388号新业大楼八楼邮编: 200030 电话: (021)54902300传真 (021)54902302E-mail:..com北京销售中心地址:北京朝阳区朝外大街22号泛利大厦7层10号邮编: 100020电话: (010)65882468 传真:(010)65881725E-mail:. .com周晓Endress+Hauser Shanghai物位产品经理周晓Slide 311/5/2016物位仪表 Level Measurement电容式物位仪表Capacitive Level Measurement音叉式限位开关Vibration Level Limit Switches超声波物位仪Ultrasonic Level Measurement微波式物位仪Microwave Level Measurement静压式液位计Hydrostatic Level Measurement伽玛射线Radiometric Level Measurement重锤式物位仪Elec.-Mech. Level Measurement差压式物位仪Differential-Pressure Level Transmitter周晓Slide 411/5/2016液体音叉Liquiphant IILiquiphant MLiquiphant FailsafeLiquiphant T周晓Slide 511/5/2016液体音叉周晓Slide 611/5/2016音叉–原理symetrical 2 rodsensor (frequencyshift limit switch)drivereceiverstraight vibration rodbent vibration rod??f周晓Slide 711/5/2016alternating voltage causes the piezo toexpand and contractindividual crystalshave a fixedalignment and are polarisedvoltage applied like poles reject - press -voltage appliedunlike poles attract- crystals elongate -+++++–––––––––+++++–+–+––+–+–+––+–+–+––+++––+音叉–原理周晓Slide 811/5/monelectrodeDriveralternating voltage causes the piezo toexpand and contractForceindividual crystalshave a fixedalignment and are polarisedvoltage applied like poles reject - press -力力Receiver音叉–原理周晓Slide 911/5/2016faultimmersed length[mm]120fa-10%fafa+ 5%600f (Hz)fa= fork resonance frequency in air (approx. 400 Hz )fa-10%= switch pointfa+5%= corrosion alarm ( 60 s delay ) f < 120 Hz = alarm function ( s delay, 10 s by PMF, . broken piezo wire, no power supply )f > 600 Hz= alarm function ( s delay, . device error )5000faultnormal operationswitch point音叉–原理周晓Slide 1011/5/2016changing liquidsfoamgas bubblesbuild - upelectrial propertiespressure- and temperature changedensity changeplant vibrationviscosity changeturbulencessuspended solids音叉–稳定,可靠
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