| 摘要 |
The device for measuring the density or viscosity of a fluid flowing in a closed passage (2) includes a rotor (5) whose speed of rotation is directly dependent on the rate of flow of the fluid. The rotor (5) is connected to an activatable and deactivatable brake means (13, 14, 15) which has an adjustable braking force. Depending on the setting of the brake means, the brake is operative to cause a greater or smaller lag in the rotary speed of the rotor (5) in relation to an unbraked rotor (5) or a rotor braked with a smaller force. The measuring means (9, 10, 11, 12) is operative to determine the resultant different rotational speeds of the rotor (5), and the difference in these speeds is a measurement of the viscosity and/or density of the fluid. |
