Endress+Hauser FTL31 Series Vibronic Level Switch Vibronic point level switch for overfill prevention or pump protection in liquids. The Liquiphant FTL31 is a vibronic point level switch for liquids. The device is used for overfill prevention or pump dry-run protection in cleaning systems. The measurement is not affected by conductivity, build-up, turbulence, flow or air bubbles and and does not require calibration. The optional IO-Link capability allows easy and time-saving configuration. The FTL31 works in areas where other measuring principles are not suitable due to conductivity, build-up, turbulences, flow conditions or air bubbles Smallest vibronic sensor on the market External function test with test magnet Onsite function check possible thanks to LED indication