Online viscometerSensors are mainly composed of sensitive components, probes, spindles, torsional vibration mechanisms, circuit drives, electromagnetic mechanisms, coils, crossbars, transmission mechanisms, torque tubes, flanges, etc.
The key to sensors lies in their ingenious structural design. This structure can be equivalent to a second-order system with a single degree of freedom, and its components are complex and each plays its own role. Sensitive components, as important components for directly sensing fluid characteristics, work closely with contact probes to accurately capture fluid changes. The spindle plays a crucial transmission function in the entire system, while the transmission mechanism ensures the effective transmission of power and motion.

The electromagnetic mechanism and drive circuit provide stable and accurate excitation current for the entire system. When the excitation current causes resonance in the torsional vibration mechanism, the strong resonance energy quickly drives the spindle to form torsional vibration. This torsional vibration is like a precise messenger, quickly and accurately transmitted to sensitive components through the efficient transmission mechanism of the spindle.

After receiving the vibration signal, the sensitive element synchronously vibrates with the spindle and crossbar. During this process, the viscosity changes of the fluid are cleverly transformed into changes in the shear stress torque of the sensitive element. This change directly causes a change in the amplitude of motion of the sensitive component. As the viscosity of the fluid increases, the hindering effect on sensitive components becomes more significant, and the amplitude changes become more prominent. At the same time, the crossbar effectively amplifies the amplitude of sensitive components through carefully planned mechanical construction, making the amplitude changes easier to measure and monitor. With the help of differential transformer displacement sensors, microcomputers can measure the amplitude of horizontal bars extremely accurately. Subsequently, through real-time monitoring and analysis of amplitude changes, further feedback is provided to regulate the increase or decrease of excitation current. When the amplitude decreases, increase the excitation current to enhance the vibration; When the amplitude is too large, reduce the excitation current to restore it to normal. By cycling and alternating in this way, the amplitude of the sensitive element is precisely controlled to maintain a constant resonance frequency and ideal amplitude range at all times. The processor can accurately obtain the magnitude of compensation power by measuring the change in excitation current, and the square of compensation power is directly proportional to the dynamic viscosity of the fluid. Based on a specific mathematical relationship, the viscosity value of the measured object can be accurately calculated.