Device for measuring the conductivity of a liquid in order to determine very low levels of total organic carbon (TOC) in pure and ultra-pure water

Device for measuring the conductivity of a liquid, comprising a ceramic hydraulic body having a measuring chamber formed therein for containing a sampling volume to be irradiated with ultraviolet (UV) rays, said measuring chamber being defined in said ceramic hydraulic body by a base of said ceramic hydraulic body and by side walls of said ceramic hydraulic body extending from said base, a UV-transparent window being located between the measuring chamber and a source of UV rays, hermetically closing a first side of the measuring chamber, the measuring chamber opening at least on the first side onto a first surface of said ceramic hydraulic body and being closed on one side of a second surface of said ceramic hydraulic body by said base, the UV-transparent window covering at least part of the first surface, closing the measuring chamber hermetically on the side of the first surface, and wherein an inlet channel is formed in said ceramic hydraulic body for feeding the measuring chamber with liquid to be measured and an outlet channel is formed in said ceramic hydraulic body for removing the measured liquid from the measuring chamber, the inlet channel and the outlet channel emerging on either side beyond a surface exposed to UV rays, and only the sampling volume contained in the measuring chamber is irradiated, wherein said base comprises two electrodes positioned in said measuring chamber, and wherein the measuring chamber has a thickness of between 0.5 mm and 4 mm, a volume of greater than or equal to 400 μl and a surface area of irradiated material of less than or equal to 600 mm2.