Measuring levels of liquid and bulk solids is common and can be done for control or inventory purposes. Numerous technologies are available for measuring liquid levels including magnetic float, magneto strictive, hydrostatic, radar, TDR and electromechanical devices. However, an overlooked technology that can be used for measuring both liquid and bulk solids level exists and is often the least expensive approach, for bulk solids, and that is the RF admittance level transmitter.
The RF admittance level transmitter continuously measures the changing level of liquids and bulk solids by measuring the effect of the target materials dielectric properties on the total capacitance of the mass of material in the vessel at any given moment. Every material has a dielectric property or electric Permittivity. The RF admittance level transmitter simply measures the change of electrical capacitance. As the level of the target material in the vessel goes up or down, the capacitance increases and decreases respectively. The use of RF admittance level transmitters is typically limited to materials with a dielectric constant or relative permittivity of 1.8 and higher, though exceptions can exist.
The RF admittance level transmitter is available with a wide number of probe styles and types including rod and cable probes to meet the need of several industries and applications.
- Feed & Grain Processing
- Mining & Cement
- 4-20mA 2-wire loop powered design
- Low consumption of power (20mA Max)
- Linearity ± 1% FS or ± 0.5pF
- Temperature compensation, low temperature effect( 0.2% FS/ or 0.1pF/ )
- Easy 2 point calibration
- Probes for general purpose, high temperature, high pressure, corrosive and explosionproof applications
- Measuring range of 20~2000pF
- No blind distance, ideal for different tanks
- LCD local display
Operating Voltage: 18~30Vdc
Operating Temperature: Standard model -40~85°C, High Temperature model -40~200°C
Operating Pressure: 40kg/cm2
Analog Output: 4-20mA
Digital Output: HART