User's Manual

LX-80 User Manual
Page 4 of 32
1. Introduction
Geolux LX-80 level meter uses radar technology to provide precise contactless
measurement of level. Contactless radar technology enables quick and simple sensor
installation above the water surface and requires minimum maintenance. This functionality
is achieved by transmitting an electromagnetic wave in 80 GHz frequency range (W) and
measuring the frequency shift of the electromagnetic wave reflected from the water
surface.
Measured distance between sensor and target object is proportional to the frequency
difference between transmitted FMCW signal and received FMCW signal due to the
Doppler Effect. Radar transmits linear chirp in frequency range between 77 GHz and 81
GHz. As the distance between the radar and water increases, so does the difference
between transmitted and received frequency, enabling the level meter to precisely
determine the level of sensor in relation to the water. Due to the modulation and detection
process in the sensor very precise measurements can be achieved and sensor is not
dependent on the air temperature, humidity, or other parameters of the environment.
The level meter is available in several models, starting with LX-80-8, able to detect
objects at distances ranging from 0,1 m to 8,0 m with accuracy of 3 mm, LX-80-15
operating at the range of up to 15 m and LX-80-30 operating up to 30 m. Basic model
does measurements with frequency of 1Hz, although a faster model is available, doing 10
measurements per second (10 Hz).