1.Principle-It consists of electronic insert and probe. Probe comprises sense and shield electrodes (reference probe in absence of metallic tank). The probe is mounted on top of the tank. The sense electrode and the tank’s wall serve as the two electrodes of imperfect capacitor with service material as dielectric. Change in material level causes a change in capacitance of this capacitor. The electronic insert measures change of capacitance accurately & shows the result in mA.

2.Measuring System-Capvel is suitable for continuous level measurement and controlling in conductive or non¬conductive liquids, granular materials of homogeneous composition with stable dielectric constant. It consists of electronic insert and probe. Probe comprises of sense and the shield electrodes (reference probe in absence of non-metallic tank). The probe is mounted on the top of the tank. The sense electrode and the tank’s wall (reference probe in absence of non-metallic tank) serve as the two electrodes of imperfect capacitor with the service material as the dielectric. Change in material’s level causes a change in capacitance of imperfect capacitor. The electronic insert measures the change of capacitance accurately and shows the result on display in mA/percentage form. An external relay can also be operated by feeding the required data. See Figure 2 for reference.