We use Ultrasonic Level Sensors to calculate the accurate height with analog signal. The level height is calculated from the time it takes for ultrasonic pulses to travel from the sensor to the surface of the medium and back. Chemical and physical properties of the medium do not influence the measurement result. Therefore, aggressive and abrasive, viscous and adhesive media can be measured without problems. Other than this we also use Multiprobe Level Sensors. We use the following makes :