German SELET sensors, SELET models, SELET prices

SELET sensors are sensors that use laser technology for measurement. They consist of a laser emitter, a laser detector, and a measurement circuit. Laser sensors are a new type of measuring instrument; their advantages include the ability to perform non-contact long-distance measurement, high speed, high precision, large measuring range, and strong resistance to optical and electrical interference.

SELET sensor classification

Load cells are divided into 8 categories based on conversion methods, including photoelectric, hydraulic, electromagnetic force, capacitive, magnetic pole variation, vibratory, gyroscope, and resistive strain gauge types, with resistive strain gauge being the most widely used. 1) Photoelectric type: includes grating type and code disk type. Grating sensors use Moiré fringes formed by gratings to convert angular displacement into optoelectronic signals. There are two gratings: one fixed grating and one moving grating mounted on the dial shaft. The object being measured on the load-bearing platform rotates the dial shaft through a force transmission lever system, driving the moving grating to rotate and causing the Moiré fringes to move. Using a phototube, conversion circuit, and display instrument, the number of moved Moiré fringes can be calculated to determine the angle of grating rotation, thereby determining and reading the mass of the object. Code disk sensors: The code disk (symbol plate) is a piece of transparent glass mounted on the dial shaft, featuring black and white codes arranged according to a specific encoding method. When the object on the load-bearing platform causes the dial shaft to rotate via the force transmission lever, the code disk also rotates by a certain angle. A photocell receives the light signal passing through the code disk and converts it into an electrical signal, which is then digitally processed by the circuit, finally displaying the digital value representing the measured mass on the display. Photoelectric sensors were mainly used in electromechanical combination scales. 2) Hydraulic type: Under the action of the gravity P of the measured object, the pressure of the hydraulic oil increases, with the increase proportional to P. By measuring the increase in pressure, the mass of the object can be determined. Hydraulic sensors have a simple and robust structure and a large measuring range, but accuracy generally does not exceed 1/100. 3) Capacitive type: It operates based on the proportional relationship between the oscillation frequency f of the capacitor oscillator circuit and the distance d between the plates. There are two plates, one fixed and the other movable. When the object is loaded onto the load-bearing platform, the leaf spring deflects, changing the distance between the two plates, which in turn changes the oscillation frequency of the circuit. By measuring the change in frequency, the mass of the object on the load-bearing platform can be calculated. Capacitive sensors consume little power, have low cost, and have an accuracy of 1/200 to 1/500.

SELET sensor features

Resistors, inductors, and capacitors are the three major types of passive components in electronics. Capacitive sensors convert changes in the measured quantity into changes in capacitance; they are essentially capacitors with variable parameters. Capacitive sensors have the following advantages: high impedance, low power, requiring only very low input energy. They can achieve large changes, resulting in high signal-to-noise ratio and system stability. Fast dynamic response, with operating frequencies reaching several megahertz, suitable for non-b contact measurement; the measured object can be either a conductor or a semiconductor. Simple structure, strong adaptability, capable of working in harsh environments such as high/low temperatures and strong radiation, with wide application. With the development of electronic technology and computer technology, disadvantages of capacitive sensors, such as susceptibility to interference and distributed capacitance, have been continuously overcome. Additionally, capacitive grid displacement sensors and integrated capacitive sensors have been developed. Therefore, they are widely used in non-electrical quantity measurement and automatic detection, capable of measuring parameters such as pressure, displacement, speed, acceleration, A degree, thickness, liquid level, humidity, vibration, and component content. Capacitive sensors have good development prospects.

SELET sensor installation precautions

1) Handle load cells with care. Especially for low-capacity sensors using aluminum alloy as the elastic element, any impact or drop caused by vibration is very likely to cause significant output errors. 2) When designing the loading device and during installation, ensure that the line of action of the applied force coincides with the force axis of the load cell, to minimize the effects of tilting and eccentric loads. 3) Regarding level adjustment. If a single load cell is used, adjust the mounting surface of its base with a spirit level until it is horizontal; if multiple sensors are used for simultaneous measurement, their base mounting surfaces should be kept on the same horizontal plane as much as possible, primarily to ensure that the force borne by each sensor is basically consistent. 4) Determine the rated load of the selected sensor according to the capacity range specified in its instructions. 5) To prevent chemical corrosion, apply Vaseline to the outer surface of the load cell during installation. Avoid use in locations with direct sunlight exposure or drastic environmental temperature changes. 6) Install bypasses made of copper braided wire at both ends of the load cell loading device. 7) Do not extend the cable on your own. If extension is absolutely necessary, solder the connections, and apply moisture-proof sealant. 8) It is best to use baffles around the load cell to cover it. This prevents debris from falling into the moving parts of the sensor, which would affect its measurement accuracy. 9) Keep the sensor cable away from high-power power lines or locations with pulse waves. If avoidance is impossible, route the load cell cable separately through an iron pipe. Minimize the connection distance as much as possible. 10) Determine the rated load of the sensor to be used based on the load cell capacity specified in the instructions, Although the load cell itself has a certain overload capacity, such situations should be avoided as much as possible during installation and use. Short-term overload may also cause permanent damage to the sensor. 11) For high-precision applications, the load cell and instrument should be used after preheating for 30 minutes.

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