Rotary viscometer is rotated by a synchronous motor at a stable speed, connected to a scale disc, and then driven by the hairspring and the shaft to rotate the rotor. If the rotor is not subjected to liquid resistance, the hairspring, the pointer and the dial rotate at the same speed, and the pointer is on the dial The indicated reading is “0.” Conversely, if the rotor is subjected to viscous resistance of the liquid, the balance spring produces a torque that eventually reaches equilibrium with the viscous resistance. At this time, the pointer connected to the hairspring indicates a certain reading on the dial (ie, The twist angle of the hairspring). Multiply the reading by a specific factor to obtain the viscosity of the liquid. The rotation speed of the viscometer is changed by the gear system and the clutch through the speed control knob. Four kinds of rotors, Nos. 1-4 are attached, according to the liquid to be measured. The height is matched with the rotation speed; it is equipped with a fixed pointer control mechanism, which is used for accurate readings. When the rotation speed is fast (30 rpm, 60 rpm), the reading can not be made while rotating, then you can press gently. Pointer lever, so that the pointer is fixed, easy to read; also equipped with a fixed bracket and lifting mechanism, generally in the laboratory for small and fixed temperature determination should be fixed. The instrument is fixed on the bracket to ensure the test Accuracy; damp helical gear and lifting mechanism, to ensure smooth movements instrument; when using the extension cable and to facilitate the low level of the test liquid in a larger container, and the measured liquid over-temperature condition.