German SEIKOM sensor SEIKOM model SEIKOM price

SEIKOM sensors are devices that convert magnetic signals into electrical signals. By leveraging the transformation relationship between magnetic quantities and other physical quantities, using a magnetic field as the medium, they can also convert signals of other non-electrical physical quantities into electrical signals. There are two drive methods: one uses a permanent magnet for actuation, and the other uses 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 trigger 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 close. Using magnetic induction sensors to replace limit switches that rely on mechanical contact improves system reliability and service life; therefore, they are often used in programmable logic controllers (PLCs) as position confirmation signaling devices.

SEIKOM sensor structure

It consists of two parts: the scale grating and the grating readhead. The figure on the right shows the structure of the linear encoder scale. The key component of the grating measurement device is the grating readhead, which consists of a light source, condensing lens, index grating, photoelectric elements, and adjustment mechanisms. Grating readheads come in many structural forms, classified based on their structural characteristics and application scenarios into direct-reception readheads (also known as silicon photovoltaic cell readheads), mirror-image readheads, beam-splitter readheads, and metal grating reflective readheads.

SEIKOM sensor principle

The essence of a grating displacement sensor is to measure position by using the grating pitch as a standard ruler. High-resolution linear encoder scales are generally expensive and difficult to manufacture. To improve system resolution, Moiré fringes need to be subdivided; grating scale sensor systems mostly adopt electronic subdivision methods. When two gratings overlap with a slight inclination angle, Moiré fringes are generated in a direction roughly perpendicular to the grating lines. As the grating moves, the Moiré fringes move up and down accordingly. This converts the measurement of the grating pitch into the measurement of the number of Moiré fringes. Within the width of one Moiré fringe, placing 4 photoelectric devices at specific intervals enables electronic subdivision and direction discrimination. For example, for a linear encoder scale with 50 line pairs/mm, the grating pitch is 0.02mm. If four-fold subdivision is applied, counting pulses with a resolution of 5μm can be obtained, which achieves high precision in general industrial measurement and control. Since displacement is a vector, both its magnitude and direction must be detected; therefore, at least two photoelectric signals with different phases are required. To eliminate common-mode interference, DC components, and even harmonics, differential amplifiers composed of low-drift operational amplifiers are typically used. The 4 photoelectric signals obtained from 4 photosensitive devices are sent to the input terminals of 2 differential amplifiers respectively. The two signals output from the differential amplifiers have a phase difference of π/2. To obtain direction discrimination and counting pulses, these two signals must first be shaped into square waves with a duty cycle of 1:1. Then, by comparing the phase of the square waves, the movement direction of the linear encoder scale can be determined. By counting the square wave pulses, the displacement and velocity of the linear encoder scale can be obtained.

SEIKOM sensor usage precautions

When plugging or unplugging the connector between the linear encoder scale sensor and the digital display unit, ensure the power is turned off. Add a protective cover whenever possible, and promptly clean chips and oil splashed onto the scale. Strictly prevent any foreign objects from entering the housing of the linear encoder scale sensor. Regularly check whether the installation mounting screws are loose. To extend the life of the dust-proof sealing strip, apply a thin, uniform layer of silicone oil to the sealing strip, taking care not to splash it onto the glass grating etched surface. To ensure the reliability of the linear encoder scale sensor, clean and wipe the scale surface and index grating surface with an ethanol mixture (50% each) at regular intervals to keep the glass scale surface clean. Linear encoder scale sensors are strictly prohibited from being subjected to severe vibration or impact, to avoid damaging the scale; if the scale breaks, the sensor will fail. Do not disassemble the linear encoder scale sensor yourself, and never arbitrarily change the relative gap between the main scale and the secondary scale. Otherwise, this may damage the sensor's precision and cause relative friction between the main and secondary scales, damaging the chrome layer and thus the grating lines, resulting in scrapping of the scale. Take care to prevent oil and water contamination of the scale surface, to avoid disrupting the distribution of grating lines and causing measurement errors. Linear encoder scale sensors should avoid working in environments with severe corrosive effects, to prevent corrosion of the grating chrome layer and scale surface, which would degrade the quality of the scale.

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