The subject innovation relates to a connection structure applied to one of the displacement-type water level transmitter in a method of measuring the Storage in water level changes tank, a high temperature, the internal pressure of the measuring equipment in a high pressure process, maintaining the durability and protect the electronic circuit features It relates to a structure for minimizing heat transfer for. The subject innovation is the flux which is inserted in the rear end parts of the guard parts of the torsion bar sealing the rear end parts of the torsion bar guard; Housewife with my wedge-shaped torsion bar formed on the inner circumference above the tip guard; And coupled to the distal end of the torsion bar and the wedge member having a wedge-shaped outer peripheral portion corresponding to the inner periphery the wedge-shaped; It is fastened to the distal end portion and a torsion bar guard bar nuts that fix the wedge-shaped close contact with the outer periphery of the wedge member in the wedge-shaped torsion bar portion guard housewives; Heat radiation housing to be inserted between the flange and the Adjust housing; The gasket and the aramid fiber material is inserted between the flange and the heat radiation housing; It is configured to include a register ring of polyphenylene sulfide material which is inserted between the housing and the heat radiating housing Adjust. Level, the displacer, torque tube transmitters, thermal barrier structure