RF Series: How it works


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	The RF 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. The detection circuitry [A] compares this signal with a fixed reference RF signal. The phase difference between these two radio frequency signals causes the output relay to alarm. The electronics sense a change in the electrical characteristics when material covers the probe [B]. The radio frequency signal driving the active sensing section of the probe will change when material is present. EZ-CAL^® calibration allows calibrating the unit to air, without removing the cover or moving the material in and out of the vessel