German VONROLL sensors, VONROLL models, VONROLL prices

VONROLL sensors are devices that convert mass signals into measurable electrical signal outputs. When using sensors, the actual working environment of the sensor should be considered first. This is crucial for the correct selection of load cells, as it affects whether the sensor 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, column cylinder type, etc.

VONROLL sensor classification

Load cells are divided into 8 categories according to conversion methods, including photoelectric, hydraulic, electromagnetic force, capacitive, magnetic pole variation, vibratory, gyroscopic, and resistance strain gauge types, with resistance 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 photoelectric signals. There are two gratings: one fixed grating and one moving grating mounted on the dial shaft. The measured object placed on the load-bearing platform rotates the dial shaft through the force transmission lever system, driving the moving grating to rotate and causing the Moiré fringes to move accordingly. Using a phototube, conversion circuit, and display instrument, the number of moved Moiré fringes can be calculated to measure the angle of grating rotation, thereby determining and reading the mass of the measured object. Code disk sensor: 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 measured 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, and finally displays the number representing the measured mass on the display. Photoelectric sensors 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 sensors 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 measured object is loaded on the load-bearing platform, the leaf spring deflects, changing the distance between the two plates, and the oscillation frequency of the circuit changes accordingly. By measuring the change in frequency, the mass of the measured object on the load-bearing platform can be calculated. Capacitive sensors consume less power, have low cost, and have an accuracy of 1/200 to 1/500.

VONROLL sensor features

Resistors, inductors, and capacitors are the three major types of passive components in electronic technology. Capacitive sensors are sensors that 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 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 measured objects. Simple structure, strong adaptability, can work in harsh environments such as high and low temperatures and strong radiation, and are widely applied. With the development of electronic technology and computer technology, the disadvantages of capacitive sensors, such as susceptibility to interference and distributed capacitance, have been continuously overcome, and 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, component content, etc. Capacitive sensors have good development prospects.

VONROLL sensor installation precautions

1) Handle load cells with care, especially small-capacity sensors 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 installing, ensure that the action line of the loading force coincides with the force axis of the load cell to minimize the influence of inclined and eccentric loads. 3) Regarding horizontal adjustment. If a load cell is used, the installation plane of its base must be adjusted to horizontal using a level; if multiple sensors are used for simultaneous measurement, their base installation surfaces should be kept on the same horizontal plane as much as possible. The main purpose of this is to ensure that the force borne by each sensor is basically consistent. 4) Determine the rated load of the sensor used according to the load cell capacity selection 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 direct sunlight and environments with drastic temperature changes. 6) Add bypasses made of copper braided wire to both ends of the load cell loading device. 7) Cable lines should not be extended by oneself. If extension is truly necessary, solder the joints with tin and add moisture-proof sealant. 8) It is best to use some baffles around the load cell to cover the sensor. The purpose of this is to prevent debris from falling into the moving parts of the sensor, affecting its measurement accuracy. 9) The sensor cable should be kept away from high-power power lines or places with pulse waves. If avoidance is impossible, the load cell cable should be threaded separately into an iron pipe, and the connection distance should be shortened as much as possible. 10) Determine the rated load of the sensor used according to the load cell capacity selection in its instructions. Although the load cell itself has a certain overload capacity, such situations should be avoided as much as possible during installation and use. Sometimes short-term overload may cause permanent damage to the sensor. 11) In high-precision application scenarios, the load cell and instrument should be used after preheating for 30 minutes.

Weidou Intelligent Technology specializes in selling German VONROLL sensors, VONROLL proximity sensors, VONROLL distance sensors, VONROLL vision sensors, VONROLL displacement sensors, VONROLL load cells, VONROLL speed sensors, VONROLL photoelectric sensors, VONROLL position sensors, VONROLL angle sensors, VONROLL tactile sensors, VONROLL temperature sensors, VONROLL pressure sensors, VONROLL flow sensors, VONROLL level sensors, VONROLL motion sensors, VONROLL process sensors. Original German imports. Welcome customers to inquire and order.