Abstract: A stirrer having a complete enamel coating suitable for mounting in a closed coverless reaction vessel, being provided with paddles which are detachably fixed on the shaft for operation inside the vessel by an enamel to enamel coupling obtained by simple pressure without the use of gaskets.

Abstract: A probe terminal for measuring the temperature inside of an enamelled reactor, for allowing a high speed of response to change in temperature and for detecting damage to the enamel of the reactor comprising a hollow cylindrical metal body provided at one end of a base in which is inserted and anchored, with enamel, a platinum cylinder hollow, the base of the platinum cylinder being unlined and in alignment with the enamel which coats the external surface of the hollow cylindrical metal body base, i.e., HCMB. One end of the HCMB contains the platinum cylinder. The other end of the HCMB is provided with means for attachment to the probe.