Bimetallic thermometer WSS_401/481/411/301 f f represent what mean?

Bimetallic thermometer is widely used in industry, its working principle is to round shape into threaded heat bimetallic strip as thermal devices, and put it in a protective sleeve tube, one end is fixed, known as the fixed end, the other end of the connection on a thin shaft, called the free end. Spool at the free end is equipped with a pointer. When the temperature changes, the resulting thermal devices the free end of the rotation, drive the thin axis from the Angle of the pointer changes, corresponding temperature indicator on the dial. According to the using environment is different, we also give bimetallic thermometer are classified, and the provisions of the code for them, today we use a diagram explain the meaning of this code. WSS - 401 on behalf of the axial type, movable external thread bimetallic thermometer WSS - 481 on behalf of universal type, movable external thread bimetallic thermometer WSS - 411 F represents the radial type, movable external thread bimetallic thermometer, on behalf of the anticorrosive WSS - F 301 on behalf of the bimetallic thermometer axial type, F represents the corrosion as far as 301 F dial diameter of 60 mm diameter of 100, 401, 481, 411 F dial mm401, 411, 481 on behalf of the axial type 1 representative radial type 8 representative universal type