Today most filters are still replaced by scheduled maintenance, since no viable RLI sensor is yet available. Some filtration systems, like inside HVACs, may employ Differential Pressure Sensors which provide an indirect measurement of a filter approaching saturation. However these have major shortcomings, a cumbersome mechanical installation since they need a by-pass to the main fluid path, which makes them expensive and unusable for mission critical safety applications. Use of Differential Pressure Sensors is relegated to particle filters since they cannot be applied to vapor filtration, such activated carbon or silica filters.
SENSIPLUS provides a low cost, miniature RLI to all material based filters. Our product can be applied universally to HEPA, Fiber, Paper and Active Carbon or Silica Filters for Oil, Air, Gasoline and Water filtration.
It is an highly accurate, temperature compensated direct measurement of the impedance spectra of the filter as an indications of its saturation.