M. Santo Zarnik, F. Novak.
Effect of condensing environments on characteristics of piezoresistive ceramic pressure sensors.
Sensors and actuators A, Physical, 2017, doi: 10.1016/j.sna.2017.10.038.
A humid atmosphere with water drops is among the most problematic environments for
pressure sensors. In general the sensors are protected against harmful effects of media with conformal
coatings which, however, in some way affect the characteristics of the sensor. LTCC technology enables
manufacturing of the sensing structures that may operate in harsh environments without additional
protection. Independently of the implemented protection we should be aware of the changes in the
sensor response to the occasional contact with water drops, which result from the changed thermal
conditions in the sensing structure. Our experiments demonstrated the influence of the protective
coating on the response of the sensor exposed to a humid environment or immersed in the water as well
as the effects of the changes in the response due to the water drops applied on the sensor without
protection. Appropriate measures taken on the basis of forecasting sensor operation in condensing
environments are a part of proactive system maintenance.