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上海席肯电子科技有限公司 主营:NOHKEN(日本能研),MOBREY()英国莫博瑞),SIMENES(德国西门子),浮球液位计,阻旋料位计,磁翻板液位计,音叉料位计,射频导纳料位计,超声波液位计,雷达料位计,连杆浮球液位计, 磁致伸缩液位计, 流量开关, 空气锤,气动振动器,
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盛兴集团app NOHKEN静电容量式物位开关

  • NOHKEN静电容量式物位开关
  • Features
  • Easy programming by push buttons
  • Multifunctional with microcomputer
  • First level switch to have status indicating LCD
  • Improved buildup prevention performance
  • Extremely reliable
  • Principle of Operation

       

      Set range is divided into 8 segments, and ON/OFF points are set for the segments. Hysteresis is also programmable.

The basic oscillator circuit is of the parallel resonance circuit with L (coil) and C (capacitance between the electrodes).
The oscillation frequency (f) of this circuit is : f = 1/2 π √LC.
The frequency without material around the sensor (f1) is: f1 = 1/2 π √LC, where C is the capacitance without material around the sensor (zero point).
With material around the sensor, the capacitance increases (C+ΔC), and the frequency (f2) is: f2 = 1/2 π √L(C+ΔC), where C+ΔC is the capacitance with material around the sensor (span point).
The sensor detects the frequency change from f1 to f2, and actuates the relay. The frequency range is divided into 8 segments (between zero and span), and the set and reset points assigned on a desired segment, which means high limit, low limit and hysteresis can be programmed.

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