dew point sensor raw data transformation problem

[enkidu]

Hi! Recently I had a problem with converting "Dew Point" sensor raw data to Fahrenheit.
It seems when dew point value is lower than 0 then I should use the following formula for Celcius to Fahrenheit transformation:
sensor_dew_point_value/100 * 1.8 + 32
But when sensor data is higher then 0, then I should use the following formula:
sensor_dew_point_value/10 * 1.8 + 32
Am I correct or did I miss something?