A sample taking coolant in particular for nuclear power-stations

A sample taking coolant, in particular for nuclear power-stations, comprising a turbular coil sealingly mounted within an enclosure through which a fluid-sample can be fed in order to be cooled in said coil by a cooling fluid flowing in sadi enclosure, the latter being provided with inlet and outlet conduits for the cooling-fluid and with passages for said coil, characterized by a special arrangement of said inlet and outlet tubes and by passages for the coil in a tubular grid carrying said coil, said grid forming a ront-wall in said enclosure, the latter also comprising a removable cover, sealingly mounted with respect to the tubular grid