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The WLI capacitive sensor probe is a non-conductive probe that determines the level of liquid in a tank by measuring the change in frequency due to the change of capacitance across the probes the liquid changes height. This is accomplished by using the probes as the plates of a capacitor and the liquid as the insulator between the plates. The probe is calibrated to the dielectric constant of water. The probe is also sealed against the environment in order to insure long life and accurate performance. WLI Series is designed as a level indicator onlyand should not be used as a level controller. WLI Series can be usedin conjunction with WLC units.The can be used in place of any Ultrasound Level Indicator, especially in water where there can sometimes be technical issues with the Ultrasound technology. The output is a 0 to 20 mA signal that can drive a resistance up to 1100 Ohms. The input voltage required is 24 VDC. By using a current output, the output becomes immune to interference from outside sources. The output accuracy is stepped in 5% increments over the length of the probe and is accurate by plus or minus 10% over the length of the sensor.