Germany GMS SRL sensor GMS SRL model GMS SRL price

GMS SRL sensors are devices that convert magnetic signals into electrical signals. By utilizing the transformation relationship between magnetic quantities and other physical quantities, with the magnetic field as a medium, they can also convert signals of other non-electrical physical quantities into electrical signals. There are two driving methods: one is driven by a permanent magnet, and the other is driven by an electromagnetic coil. The former is mostly used for detection; for example, if a moving part is made of a magnet, it will attract and emit a signal once it approaches the magnetic induction sensor. The latter is mostly used for control; if the electromagnetic coil is energized, the contacts will attract. Using magnetic induction sensors to replace limit switches that rely on collision contact can improve system reliability and service life; therefore, they are often used in programmable logic controllers (PLCs) as signaling devices for position arrival.

GMS SRL sensor detection principle

Detects magnetic losses caused by eddy currents generated on the surface of a conductor under the influence of an external magnetic field. This detection method involves generating an alternating magnetic field within the detection coil and detecting impedance changes caused by eddy currents produced in the metal object being detected. 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.

GMS SRL sensor classification

1) Capacitive proximity sensor: This is a capacitive proximity switch with an electrode as the detection terminal. It consists of a high-frequency oscillation circuit, a detection circuit, an amplification circuit, a shaping circuit, and an output circuit. Normally, there is a certain capacitance between the detection electrode and the ground, which becomes part of the oscillation circuit. When the detected object approaches the detection electrode, the electrode, being voltage-biased, undergoes polarization due to electrostatic induction. The closer the object gets to the detection electrode, the more induced charge accumulates on the electrode. Since the electrostatic capacitance of the detection electrode is C, the capacitance C of the detection electrode increases as the charge increases. Because the oscillation frequency of the oscillation circuit is inversely proportional to the capacitance, the oscillation weakens or even stops when the capacitance C increases. These two states, oscillation and non-oscillation, are converted by the detection circuit into a switch signal for output. 2) Inductive proximity sensor: Consists of a high-frequency oscillation circuit, a detection circuit, an amplification circuit, a shaping circuit, and an 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 . When alternating current flows through the detection coil, an alternating magnetic field is generated around it. When a metal object approaches the detection coil, eddy currents are generated in the metal object, absorbing magnetic field energy and causing changes in the inductance L of the detection coil. This reduces the oscillation frequency of the circuit, potentially stopping oscillation. The oscillation and non-oscillation states are converted by the monitoring circuit into a switch signal output. 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 target metal, so the detection distance also varies with the type of target metal. 3) Photoelectric proximity sensor: 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, with the two axes intersecting at a point in front of the sensor. When the surface of the detected object approaches the intersection point, the reflected light from the LED is received by the phototransistor, generating an electrical signal. When the object moves away from the intersection point, the reflection area falls outside the viewing angle of the phototransistor, and the detection circuit produces no output. Generally, the drive current supplied to the LED is not direct current but alternating current of a specific frequency. Thus, 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 can effectively prevent interference from other stray light and increase the luminous intensity of the LED.

GMS SRL sensor applications

Proximity sensors are mainly 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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