how electro pneumatic positioner works ?

  The electro -pneumatic positioner is used in Control Valves with pneumatically operated actuators. The valve is operated by means of electrical controller or Control Systems With an control signal of 4 to 20 mA or split ranges of 4~12/ 12~20 mA. Electro-Pneumatic Positioner converts this control signal into a pneumatic output in proportion to the lift of… Read More »

What is NFC ?

NFC : Near field communication NFC is short range high frequency wireless communication technology.                                                           NFC is mainly for mobile and handheld device.        … Read More »

Mechanical vibration switches

A much simpler alternative to continuous vibration sensors (displacement or acceleration) and monitoring equipment suitable for less critical applications is a simple mechanical switch actuated by a machine’s vibration. These switches cannot, of course, quantitatively analyze machine vibrations, but they do serve as qualitative indicators of gross vibration. The following photograph shows a Robertshaw “Vibraswitch” unit: This switch… Read More »

Electrodeless conductivity probes

An entirely different design of conductivity cell called electrodeless uses electromagnetic induction rather than direct electrical contact to detect the conductivity of the liquid solution. This cell design enjoys the distinct advantage of virtual immunity to fouling, since there is no direct electrical contact between the measurement circuit and the liquid solution. Instead of using two or four… Read More »

How encoder work ?

There are two types of mechanical configurations for optical encoders: rotary encoders and linear encoders. Optical rotary encoders are most commonly found in motion control systems while linear encoders are used more specifically for linear-positioning applications such as piston or actuator monitoring systems. A rotary encoder using optical sensing technology relies on the rotation of… Read More »