Brief introduction of potential controller

The potential controller can be regarded as a potentiostat with limited function. Its circuit and requirements are the same as those of conventional potentiostat. Potential control has two functions: sensing and controlling. The sensor circuit is essentially a high impedance voltmeter because the impedance of the reference electrode is also very large. Generally, a market value reading device is installed to monitor the potential of the protected system.



The intermittent operation potential controller can only be applied when the protection potential range is large enough and the potential must be slowly reduced to the bottom limit of the protection potential range after power failure. In this kind of device, the adjustable contact of the relay is used to make or cut off the polarization current, and the power on time is often shorter than the power-off time.



The potential controller measures and collects the potential signal between the reference electrode and the protected equipment, compares the potential with the preset given potential, and the difference is used to control the current output of the power supply. The difference signal is fed back to the current controller to control the operation of the current controller to adjust the DC current between the auxiliary cathode and the protected metal surface.



The point operation accuracy of the field instrument does not need to be as high as that of the laboratory potentiostat. The potential controller with continuous operation can be used to provide anode protection for equipment to control corrosion. Therefore, the protection potential range of the metal to be protected shall not be less than 50 mV.