German bosche sensor bosche model bosche price

German bosche sensorIt is a device that converts mass signals into measurable electrical signal outputs. When using a sensor, 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 system. 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.

bosche sensor classification

Load cells are classified by conversion method into photoelectric, hydraulic, electromagnetic force, capacitive, magnetic pole variation, vibration, gyroscope, and resistance strain gauge types, totaling 8 categories, with resistance strain gauge being the most widely used. 1) Photoelectric type: Includes grating and code disk types. 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 object being weighed 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. Using phototubes, conversion circuits, and display instruments, the number of moved Moiré fringes can be calculated to measure the angle of grating rotation, thereby determining and reading the mass of the 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 specific 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 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, 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 oscillation 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 the oscillation frequency of the circuit changes accordingly. By measuring the change in frequency, the mass of the 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 1/501.

bosche sensor structural composition

1) Sensitive element: An element that directly senses the measured quantity (mass) and outputs another quantity with a definite relationship to the measured quantity. For example, the elastic body of a resistance strain gauge load cell converts the mass of the measured object into deformation; the elastic body of a capacitive load cell converts the measured mass into displacement. 2) Conversion element: Also known as a sensing element, it converts the output of the sensitive element into a signal that is easy to measure. For example, the resistance strain gauge (or resistance strain foil) of a resistance strain gauge load cell converts the deformation of the elastic body into a change in resistance; the capacitor of a capacitive load cell converts the displacement of the elastic body into a change in capacitance. Sometimes some elements perform both functions of sensitive and conversion elements. For example, the piezoelectric material of a voltage-type load cell outputs electrical charge while deforming under external load. 3) Measurement element: Converts the output of the conversion element into an electrical signal, facilitating further transmission, processing, display, recording, or control. For example, the bridge circuit in a resistance strain gauge load cell, and the charge preamplifier in a piezoelectric load cell. 4) Auxiliary power supply: Provides energy for the electrical signal output of the sensor. Generally, load cells require an external power supply to work. Therefore, as a product, the power supply requirements must be specified, but it is not considered part of the load cell. Some sensors, such as magnetoelectric speed sensors, do not require an auxiliary power supply to work normally because they output relatively high energy. Therefore, not all sensors require an auxiliary power supply.

bosche sensor installation precautions

1) Handle load cells with care, especially small-capacity sensors with aluminum alloy elastic bodies. 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 axis of the loading force coincides with the force-bearing axis of the load cell to minimize the effects of tilted and eccentric loads. 3) Regarding level adjustment. If a load cell is used, the installation plane of its base must be adjusted to horizontal using a spirit level; if multiple sensors are used for simultaneous measurement, 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 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, apply Vaseline to the outer surface of the load cell during installation. Avoid direct sunlight and environments with drastic temperature changes. 6) Connect bypassers made of copper braided wire to both ends of the load cell loading device. 7) Do not extend the cable yourself. If extension is absolutely necessary, solder the joints and apply moisture-proof sealant. 8) It is best to use baffles to cover the sensor around the load cell. This prevents 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 run separately through 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 during installation and use. Sometimes short-term overload can cause permanent damage to the sensor. 11) In high-precision applications, the load cell and instrument should be used after preheating for 31 minutes.

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