German VE GHI sensors, VE GHI models, VE GHI prices

VE GHI pressure sensors for level measurement. Submersible hydrostatic level transmitters (level gauges) operate on the principle that the static pressure of the measured liquid is proportional to its height. They use advanced imported isolated diffused silicon sensing elements or ceramic capacitive pressure sensors to convert static pressure into electrical signals. After temperature compensation and linearization, these are converted into standard electrical signals (typically 4 to 20mA/16VDC).

VE GHI sensor classification

Load cells are classified by conversion method into 8 types, including photoelectric, hydraulic, electromagnetic force, capacitive, magnetic pole variation, vibratory, gyroscopic, and resistive strain gauge types, with resistive 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 and one movable mounted on the dial shaft. The object being weighed on the load platform rotates the dial shaft via a force transmission lever system, driving the movable grating and shifting the Moiré fringes. Using phototubes, conversion circuits, and display instruments, the number of shifted Moiré fringes is calculated to determine the rotation angle of the grating, thereby determining and reading the mass of the object. Code disk sensors: A 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 platform rotates the dial shaft via the force transmission lever, the code disk also rotates by a certain angle. Photocells receive light signals through the code disk and convert them into electrical signals, which are 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 gravitational force P of the measured object, the pressure of the hydraulic oil increases, with the increase proportional to P. Measuring this pressure increase determines the mass of the object. Hydraulic sensors are simple and robust with a large measuring range, but accuracy generally does not exceed 1/100. 3) Capacitive type: It operates based on the direct proportionality between the oscillation frequency f of the capacitor oscillator circuit and the distance d between the plates. There are two plates, one fixed and one movable. When the load platform is loaded, the leaf spring deflects, changing the distance between the plates and thus the oscillation frequency of the circuit. Measuring the frequency change allows calculation of the mass on the load platform. Capacitive sensors have low power consumption, low cost, and an accuracy of 1/200 to 1/501.

VE GHI sensor structure and composition

1) Sensing 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 resistive strain gauge load cell converts the mass of the object into deformation; the elastic body of a capacitive load cell converts the measured mass into displacement. 2) Conversion element: Also known as a transducer element, it converts the output of the sensing element into a signal suitable for measurement. For example, the resistance strain gauge (or strain foil) of a resistive 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 certain elements perform both sensing and conversion functions. For example, the piezoelectric material in 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. Examples include the bridge circuit in resistive strain gauge load cells and the charge preamplifier in piezoelectric load cells. 4) Auxiliary power supply: Provides energy for the sensor's electrical signal output. Most load cells require an external power source to operate. Therefore, power supply requirements must be specified for the product, although the power supply is not considered part of the load cell itself. Some sensors, such as magnetoelectric velocity sensors, do not require an auxiliary power supply because they output sufficient energy to operate normally. Thus, not all sensors require an auxiliary power supply.

VE GHI 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 can likely result in significant output errors. 2) When designing the loading device and during installation, ensure that the line of action of the load force coincides with the force axis of the load cell to minimize the effects of tilting and eccentric loads. 3) Regarding leveling: If using a load cell, adjust the mounting plane of its base with a level until horizontal. If multiple sensors are used for simultaneous measurement, their mounting bases should be kept on the same horizontal plane as much as possible to ensure that the force borne by each sensor is basically consistent. 4) Determine the rated load of the sensor used based on the load cell capacity selection specified 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) Install bypasses made of copper braided wire at 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, which could affect measurement accuracy. 9) Keep the sensor cable away from high-power power lines or areas with pulse waves. If avoidance is impossible, run the load cell cable separately through an iron conduit and shorten the connection distance as much as possible. 10) Determine the rated load of the sensor used based on the load cell capacity selection specified in its instructions. Although load cells have a certain overload capacity, avoid such conditions during installation and use. Even short-term overloading may cause permanent damage to the sensor. 11) For high-precision applications, allow the load cell and instrument to warm up for 31 minutes before use.

Weidou Intelligent Technology specializes in selling German VE GHI sensors, VE GHI proximity sensors, VE GHI distance sensors, VE GHI vision sensors, VE GHI displacement sensors, VE GHI load cells, VE GHI speed sensors, VE GHI photoelectric sensors, VE GHI position sensors, VE GHI angle sensors, VE GHI tactile sensors, VE GHI temperature sensors, VE GHI pressure sensors, VE GHI flow sensors, VE GHI level sensors, VE GHI motion sensors, and VE GHI process sensors. Original German imports. Inquiries and orders are welcome.