Dragino LSN50 and RK520-01 0-2V sensor

Hello all,
we connected Rika RK520-01 soil moisture and temperature sensor to Dragino LSN50 (0-2V) and successfully collecting data. Dragino working in MODE3 (3ADC+I2S) and we are having readings from the sensor. But results are in Volts. Is there any proper way to convert that data to temperature and relative moisture? Technical specifications say that range for the moisture is 0-100 percent (which is OK) and the temperature range is from -30 to +70 Celsius degree. Does any have experience with this kind of data?
Thank You in advance.
Best regards,
Aleksa