Device to indicate priming of an infusion line

A device for indicating priming of an infusion line includes: a microporous membrane that blocks transmission of light therethrough when dry and that allows transmission of light therethrough when wet; a source of a light signal covered by the microporous membrane, light from the source of the light signal being transmitted through the microporous membrane upon the microporous membrane becoming wet; and a sensor 354 that senses light from the source of the light signal, the sensor 354 being separated from the source of the light signal by at least the microporous membrane, and in electrical communication with a controller 350 in communication with an alarm 352 which is activated by the controller 350 upon detection by the sensor of light from the source of the light signal. -r > 'N> 'z. n \ > C' V ,~,, N~ t~ * "N"> \N N