German VENTECH SYSTEMS sensors, VENTECH SYSTEMS models, VENTECH SYSTEMS prices

VENTECH SYSTEMS sensors are a general term for sensors designed to detect objects without physical contact, replacing contact-based detection methods such as limit switches. They convert information about an object's movement and presence into electrical signals. Detection methods that convert to electrical signals include those utilizing eddy currents generated in the metal body of the detected object due to electromagnetic induction, those detecting capacitance changes in the electrical signal caused by the approach of the detected object, and those using reed and guided switches.

VENTECH SYSTEMS sensor detection principles

Detects magnetic losses caused by eddy currents generated on the surface of a conductor under the influence of an external magnetic field. This method involves generating an alternating magnetic field within the detection coil and detecting impedance changes caused by eddy currents produced in the metal body of the detected object. Additionally, other methods include aluminum detection sensors that detect frequency phase components, and all-metal sensors that detect only impedance change components through the operating coil. A transformer state occurs on the surfaces of both the detected object and the sensor.

VENTECH SYSTEMS sensor classification

1) Capacitive proximity sensors: These are capacitive proximity switches with electrodes as the detection terminal, consisting of a high-frequency oscillation circuit, detection circuit, amplification circuit, shaping circuit, and output circuit. Normally, there is a certain capacitance between the detection electrode and ground, which becomes part of the oscillation circuit. When the detected object approaches the detection electrode, the voltage applied to the electrode causes electrostatic induction and polarization. The closer the object gets, the more induced charge accumulates on the electrode. Since the electrostatic capacitance of the detection electrode is C, the capacitance C increases as the charge increases. Because the oscillation frequency of the circuit is inversely proportional to the capacitance, an increase in capacitance C weakens or even stops the oscillation. The oscillation and non-oscillation states are converted by the detection circuit into switch signals for output. 2) Inductive proximity sensors: Composed of a high-frequency oscillation circuit, detection circuit, amplification circuit, shaping circuit, and output circuit. The sensitive element for detection is the detection coil, which is part of the oscillation circuit. The oscillation frequency of the circuit is L. When alternating current flows through the detection coil, an alternating magnetic field is generated around it. When a metal object approaches the coil, eddy currents are generated in the metal, absorbing magnetic energy and causing a change in the inductance L of the coil. This reduces the oscillation frequency, potentially stopping oscillation. These two states are converted by the monitoring circuit into switch signal outputs. Note: Similar to capacitive proximity sensors, inductive proximity sensors detect metal conductors; non-metallic conductors cannot be measured using this method. Amplitude changes vary with the type of metal in the target object, so the detection distance also varies depending on the metal type. 3) Photoelectric proximity sensors: The beam axis of the light-emitting diode (or semiconductor laser tube) and the axis of the phototransistor lie in the same plane and form a specific angle, intersecting at a point in front of the sensor. When the surface of the detected object approaches this intersection, reflected light from the LED is received by the phototransistor, generating an electrical signal. When the object moves away, the reflection falls outside the phototransistor's field of view, and the detection circuit produces no output. Typically, the drive current supplied to the LED is not direct current but alternating current of a specific frequency, so the receiving circuit also receives an alternating signal of the same frequency. Filtering the received signal to allow only signals of the same frequency to pass effectively prevents interference from other ambient light and can increase the LED's luminous intensity.

VENTECH SYSTEMS sensor applications

Proximity sensors are primarily used to detect object displacement and are widely applied in aviation, aerospace technology, and industrial production. In daily life, they are used in automatic doors and automatic heaters in hotels, restaurants, and garages. For security and anti-theft purposes, important locations such as archives, accounting departments, financial institutions, museums, and vaults are typically equipped with anti-theft devices composed of various proximity switches. In measurement technology, they are used for measuring length and position; in control technology, they are extensively used for measuring and controlling displacement, speed, and acceleration.

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