sentences:  The labor for frequent replacement of desiccant dryers, permeation components, and the sensor heads greatly increase the operational costs.Additionally, slugs of water render the system nonfunctional for long periods of time as the sensor head has to “dry-down.”
  
  The oxide sensor is made up of an inert substrate material and two dielectric layers, one of which is sensitive to humidity.The moisture molecules pass through the pores on the surface and cause a change to a physical property of the layer beneath it.