The information transmission principle of the magnetic resistance speed probe ZS-04-75-3000 in monitoring turbine speed is mainly based on the magnetic resistance effect and electromagnetic induction principle. The following is a specific introduction:

Magnetic field generation and variation
-Permanent magnet generates magnetic field: The permanent magnet inside the probe generates a constant magnetic field, which passes through the magnetic sensitive element of the probe and the object being measured (such as a gear).
-Magnetic field changes with rotation: When the object being measured (such as a gear) rotates, the tooth tips and grooves on it will periodically pass near the probe, causing a change in the magnetic flux passing through the magnetic sensitive element.

Signal generation and transmission
-The magnetoresistance effect generates a signal: the resistance value of a magnetic sensitive element (such as a magnetoresistance element) changes with the variation of magnetic flux, and this phenomenon is called the magnetoresistance effect. When the magnetic flux changes, the resistance value of the magneto resistive element also changes, thereby generating a voltage signal at both ends of the element that is proportional to the change in magnetic flux.
-Signal transmission: This voltage signal is transmitted to the monitoring system through the lead wire of the probe. Lead out wires are usually made of metal shielded flexible conductors, which have good anti-interference performance and can ensure that signals are not affected by external electromagnetic interference during transmission.

Signal processing and Display
-Signal processing: After receiving the voltage signal, the monitoring system will amplify and filter it through internal signal processing circuits to improve the signal-to-noise ratio and stability of the signal.
-Speed calculation and display: The processed signal is sent to devices such as microprocessors or counters. By calculating the number of pulses in the signal per unit time, combined with parameters such as the number of teeth of the measured object, the speed of the steam turbine is calculated, and the speed data is displayed in real-time on the screen.

advantage
-Non contact measurement: There is no need for contact between the probe and the object being measured, avoiding wear and mechanical interference, and improving the reliability and lifespan of the measurement.
-High anti-interference performance: using electromagnetic induction principle, no external power supply required, large output signal, good anti-interference performance, can work stably in harsh environments such as smoke, oil and gas, water vapor, etc.
-High precision and high reliability: The magnetic resistance effect and electromagnetic induction principle make it have high measurement accuracy and reliability, which can accurately reflect the speed changes of the steam turbine.