How do I use the Truma LevelCheck properly?

Attach the Truma LevelCheck horizontally to the gas cylinder at an angle of 90°. The filling level is measured by an ultrasound signal. If liquefied gas is present within the measuring range, the signal is transmitted and reflected on the opposite wall of the cylinder (echo). The measurement result is shown by a green LED. A high-pitched acoustic signal is also output.

If there is no gas at the measured point, the signal is not transmitted and there is no echo. In this case, a red LED lights and a deeper acoustic signal is output. If the LED on LevelCheck is green, there is gas in the cylinder. The red LED indicates that there is no gas at the measured point.