Gelbau switch Germany Gelbau model Gelbau price

Gelbau switch is a device that converts mass signals into measurable electrical signal outputs. When using a switch, the actual working environment of the switch should be considered first. This is crucial for the correct selection of load cells, as it affects whether the switch can work normally, its safety and service life, and even the reliability and safety of the entire weighing instrument. There are qualitative differences between the old and new national standards in the basic concepts and evaluation methods of the main technical indicators of load cells. The main types include S type, cantilever type, spoke type, plate ring type, membrane box type, bridge type, and column cylinder type.

Gelbau switch classification

Load cells are divided into 8 categories according to the conversion method: photoelectric, hydraulic, electromagnetic force, capacitive, magnetic pole variation, vibratory, gyroscopic, and resistance strain gauge, with resistance strain gauge being the most widely used. 1) Photoelectric type: Includes grating type and code disk type. Grating switches use Moiré fringes formed by gratings to convert angular displacement into photoelectric 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 the force transmission lever system, driving the moving grating to rotate, causing the Moiré fringes to move accordingly. Using phototubes, conversion circuits, and display instruments, the number of moved Moiré fringes can be calculated, measuring the angle of grating rotation, thereby determining and reading the mass of the object. Code disk switch: The code disk (symbol plate) is a piece of transparent glass mounted on the dial shaft, with black and white codes encoded according to a certain coding method. When the object on the load-bearing platform rotates the dial shaft through the force transmission lever, the code disk also rotates by a certain angle. The photocell receives the light signal through the code disk and converts it into an electrical signal, which is then digitally processed by the circuit, finally displaying the number representing the measured mass on the display. Photoelectric switches were mainly used in electromechanical combination scales. 2) Hydraulic type: When subjected to the gravity P of the measured object, the pressure of the hydraulic oil increases, and the degree of increase is proportional to P. By measuring the increased pressure value, the mass of the measured object can be determined. Hydraulic switches have a simple and robust structure and a large measurement range, but the accuracy generally does not exceed 1/100. 3) Capacitive type: It works 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 on the load-bearing platform, the leaf spring deflects, changing the distance between the two plates, and thus changing 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 switches consume less power, have low cost, and have an accuracy of 1/200～1/500.

Gelbau switch features

Resistors, inductors, and capacitors are the three major types of passive components in electronic technology. A capacitive switch is a switch that converts changes in the measured quantity into changes in capacitance; it is essentially a capacitor with variable parameters. Capacitive switches have the following advantages: high impedance, low power, requiring only very low input energy. They can obtain large changes, resulting in high signal-to-noise ratio and system stability. Fast dynamic response, operating frequency up to several megahertz, non-b contact measurement, suitable for both conductive and semiconductor objects. Simple structure, strong adaptability, can work in harsh environments such as high and low temperatures and strong radiation, widely applied. With the development of electronic technology and computer technology, the disadvantages of capacitive switches, such as susceptibility to interference and distributed capacitance, have been continuously overcome. Additionally, capacitive grid displacement switches and integrated capacitive switches 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 switches have good development prospects.

Gelbau switch installation precautions

1) Handle load cells with care, especially small-capacity switches using aluminum alloy as the elastic body. Any impact or drop caused by vibration is likely to cause significant output errors. 2) When designing the loading device and during installation, ensure that the axis of the loading force coincides with the force-bearing axis of the load cell to minimize the effects of inclined and eccentric loads. 3) Regarding horizontal adjustment. If using a load cell, the installation plane of its base must be adjusted to level using a spirit level. If multiple switches are measuring simultaneously, their base installation surfaces should be kept as level as possible. The main purpose of this is to ensure that the force borne by each switch is basically consistent. 4) Determine the rated load of the switch used based on the load cell capacity selection specified in its instructions. 5) To prevent chemical corrosion, it is advisable to coat the outer surface of the load cell with Vaseline during installation. Avoid use in places with direct sunlight exposure and drastic environmental temperature changes. 6) Add bypasses made of copper braided wire at both ends of the load cell loading device. 7) Cable lines should not be extended arbitrarily. If extension is absolutely necessary, solder the joints and add moisture-proof sealant. 8) It is best to use some baffles around the load cell to cover the switch. This prevents debris from falling into the moving parts of the switch, affecting its measurement accuracy. 9) The cable of the switch should be kept away from high-power power lines or places with pulse waves. If avoidance is impossible, the load cell cable should be separately routed through an iron pipe, and the connection distance should be shortened as much as possible. 10) Determine the rated load of the switch used based on the load cell capacity selection specified in its instructions. Although load cells have a certain overload capacity, such situations should be avoided during installation and use. Sometimes short-term overloading may cause permanent damage to the switch. 11) For high-precision applications, the load cell and instrument should be used after preheating for 30 minutes.

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