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Measuring principle

A radio frequency is applied to the probe and is continually analyzed to determine the influence caused by the surrounding environment. As material contacts the probe, the radio frequency shifts indicating an increase in capacitance (C). The active probe of the unit and the vessel¡¯s wall make up the two plates (A=area) of a capacitor which are separated by a fixed distance (d). The probe¡¯s insulator and surrounding air provide the dielectric material (with dielectric constant ¡°K¡±). As the air (K=1.0) is displaced with any other material (K > 1.0), the capacitance effect (C) is enhanced, thereby changing the application¡¯s impedance. This influence is measured within the circuitry and compared to a reference established by the sensitivity setting. The setting determines how much influence must be present before the output changes.

The driven shield section of the probe enables the circuitry to ignore product build-up on the probe that would otherwise cause false sensing. The driven shield is activated with the same radio frequency potential as the sensing probe. Since current can not flow between identical potentials, the driven shield blocks current flow from the active probe to the vessel wall through the material build-up, thereby eliminating the sensing of the material build-up.

Application guidelines

TrueCap RF capacitance point level sensors are versatile devices providing high and low level readings in bins, silos, tanks, hoppers, and other vessels. TrueCap's superior sensitivity range allows users to properly adjust units to meet the needs of a wide variety of applications. Whether your application is for a powder, liquid, granular solid, or viscous material, the TrueCap product line offers the right solution.

Typical Applications include, but are not limited to:
Chemicals 
Plastics
Pellets
Feed/Grain
Rubber
Pharmaceuticals
Liquids
Wastewater
Sand
Food Ingredients
Slurries
Cement
Powders
Paint & Coatings
Coal
Granular Solids
Oils
Paper Pulp  

Product list
  • RF CAPACITANCE POINT LEVEL SENSORS Designed to provide high performance and reliability with a lower cost£¬Wide assortment of probe types and options for versatility£¬Suitable for dry solids, wet solids, liquids, viscous liquids,and slurries£¬Hazardous Locations Approval Available£¬Internal bin temperatures up to 450 ¡ãF(232¡ã C)(Split-Architecture)£¬Split-Architecture to remote mount electronics£¬Immunity to product build-up on probe£¬Unaffected by high vibration(Split-Architecture)¡£

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