Signallers are designed for signalling the limit values of the level of various liquids in the tank. The principle of operation of the signalling devices is based on a significant difference in the speed of propagation of ultrasonic signals in liquid and gas.
The selected principle is realised by means of the method of pulse sensing with time and frequency selection, which consists in comparing the time of signal passage through the working gap of the sensor filled with the controlled liquid or gas with the time interval produced in the signaller itself.
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