| 1. The VRF™ Series works on the radio frequency/capacitance principle. The sensing electronics have been designed to detect the difference between the electrical characteristics of air (no material) and the material being detected.
2. A microprocessor digitally analyzes voltage and current values to characterize the complex impedance seen by the probe. The digital signal processor continuously analyzes the conductance and susceptance of the probe circuit and calculates when to alarm the unit.
3. EZ-Cal® II automatically calibrates the unit to air. If installed in material, as material discharges and leaves the probe, the VRF™ will sense the lower load (capacitance) and recalibrate. |
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