L扷nit?de Production de Systêmes Industriels (UPSI), manufactures and sells humidity and temperature sensors and measuring electronic systems, designed by the Soci閠?d抋pplications 閘ectroniques pour la Physique, la Science et l扞ndustrie (SPSI), research and development laboratories ,specialised for 30 years in physical quantities measurement.


The company capacitive technologies researches and development have been successfully employed in specific civilians and militaries applications for fifteen years, where others market products accuracy and reliability could not meet the requirements. During the last years these reliability and low market prices have allowed this technology to be applied in large volume distribution.


The UPSI humidity and temperature micro-systems based on the original SPSI UPSICAP MSS Bi-Face technology have an excellent stability and full interchange ability without recalibration.


To avoid instability cause by the interfaces the capacitive humidity cell is directly build the active substrate 抯 upper side and a digital output conditioner is integrated in the back side.


On all measurement range (60¯C), the temperature sensor has linear digital output (0.25¯C).


For sensor-transmitters this international patented technology represent a major breakthrough, allowing best reliability, lower cost and mass production without any loss of quality.


All these products have been used in air conditioning ( HVAC ) , weather measurement (radoisonde) , home appliance, aeronautics, archiving conservation, navy and qualification laboratories.


SPSI and UPSI partnership is able to propose specific solutions to is customers using