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    Load Cells / Blog Standard Whole Post

    Load Cell

    June 17, 2022
    in Force Sensors, Load Cell, Load Sensor, Sensor
    by admin

    Tension and Compression Force Sensors

    Also known as load cells, these sensors measure and track the forces of your equipment by converting them into electrical signals. Send these signals to your computer or programmable logic controller (PLC) to monitor, document, and trigger actions in your machinery.

    When choosing a sensor, consider whether you’ll be measuring tension, compression, or both; what shape would fit your application best; and how you’ll mount them. Select sensors with a capacity rating higher than the greatest load you expect them to receive. They’re designed to briefly handle forces 1.5 times greater than their load capacity to protect them from unexpected overload.

    To connect your sensor to a computer, PLC, or both, choose a sensor with a connection kit. Kits include everything you need to relay data.

    Threaded hole and threaded through-hole sensors are often used to weigh items in packaging machine bins, conveyors, and chutes. Use two or more to accurately measure uneven loads. Round with threaded through-hole sensors can be bolted to surfaces and have a low profile for applications with limited clearance. They’re commonly used to measure clamping forces.

    Button sensors have a low profile to fit where there’s limited clearance. They’re often used for weight sensing in packaging machinery and for pressure sensing in medical device prototypes.

    Threaded standoff sensors have a threaded hole to connect to eye bolts, rod ends, and threaded rods. They’re commonly mounted upside-down between a tank and a leveling mount to weigh material in small tanks and silos. Dual-sided threaded standoff sensors have threaded holes on opposite sides, so you can attach them between two components, such as a hanging scale and its load.

    Threaded stud sensors screw into equipment. Dual-sided threaded stud sensors can monitor push-pull forces, such as when testing the durability of a folding car seat over many repetitions.

    S-shaped sensors are a common choice for monitoring and testing tension in wires, cords, ropes, and harnesses.

    PC connection kits link sensors to a computer or tablet via USB cord. The included software plots and analyzes measurements, letting you track high, low, and average values over time. The software can set off connected alarms or notify you by email or text message when measurements fall outside a certain range. Data can also be exported to Microsoft Excel and other analytical software such as MATLAB and LabVIEW.

    PLC connection kits send signals from sensors to your PLC to trigger actions in your system, such as diverting items on a conveyor that exceed a certain weight.

    PLC/PC connection kits let you use the tracking and notification features of the PC software and the trigger functions of a PLC simultaneously.

    All IP rated sensors seal out dust. IP66 rated sensors stand up to spraying water. IP67 rated sensors won’t fail if briefly submersed.

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    Load Cells & Force Sensors

    June 12, 2022
    in Force Sensors, Pressure Sensor
    by admin

    What is a load cell and how does it work?
    A load cell (or loadcell) is a transducer which converts force into a measurable electrical output. Although there are many varieties of force sensors, strain gauge load cells are the most commonly used type.

    Except for certain laboratories where precision mechanical balances are still used, strain gauge load cells dominate the weighing industry. Pneumatic load cells are sometimes used where intrinsic safety and hygiene are desired, and hydraulic load cells are considered in remote locations, as they do not require a power supply. Strain gauge load cells offer accuracies from within 0.03% to 0.25% full scale and are suitable for almost all industrial applications.

    How does a load cell work?
    A load cell works by converting mechanical force into digital values that the user can read and record. The inner working of a load cell differs based on the load cell that you choose. There are hydraulic load cells, pneumatic load cells, and strain gauge load cells. Strain gauge load sensors are the most commonly used among the three. Strain gauge load cells contain strain gauges within them that send up voltage irregularities when under load. The degree of voltage change is covered to digital reading as weight.
    When to use a load cell?
    A load cell measures mechanical force, mainly the weight of objects. Today, almost all electronic weighing scales use load cells for the measurement of weight. They are widely used because of the accuracy with which they can measure the weight. Load cells find their application in a variety of fields that demand accuracy and precision. There are different classes to load cells, class A, class B, class C & Class D, and with each class, there is a change in both accuracy and capacity.
    Load Cell Types
    Load cell designs can be distinguished according to the type of output signal generated (pneumatic, hydraulic, electric) or according to the way they detect weight (bending, shear, compression, tension, etc.)
    Hydraulic load cells
    High Capacity Tension Link Load Cell Miniature load cellHydraulic cells are force -balance devices, measuring weight as a change in pressure of the internal filling fluid. In a rolling diaphragm type hydraulic force sensors, a load or force acting on a loading head is transferred to a piston that in turn compresses a filling fluid confined within an elastomeric diaphragm chamber.

    As force increases, the pressure of the hydraulic fluid rises. This pressure can be locally indicated or transmitted for remote indication or control. Output is linear and relatively unaffected by the amount of the filling fluid or by its temperature.

    If the load cells have been properly installed and calibrated, accuracy can be within 0.25% full scale or better, acceptable for most process weighing applications. Because this sensor has no electric components, it is ideal for use in hazardous areas.

    Typical hydraulic load cell applications include tank, bin, and hopper weighing. For maximum accuracy, the weight of the tank should be obtained by locating one force sensor at each point of support and summing their outputs.
    Pneumatic load cells
    Pneumatic load cells also operate on the force-balance principle. These devices use multiple dampener chambers to provide higher accuracy than can a hydraulic device. In some designs, the first dampener chamber is used as a tare weight chamber.

    Pneumatic load cells are often used to measure relatively small weights in industries where cleanliness and safety are of prime concern.High Capacity Tension Link Load Cell Miniature load cell

    The advantages of this type of load cell include their being inherently explosion proof and insensitive to temperature variations. Additionally, they contain no fluids that might contaminate the process if the diaphragm ruptures. Disadvantages include relatively slow speed of response and the need for clean, dry, regulated air or nitrogen.
    Strain-gauge load cell
    Strain gauge load cells are a type of load cell where a strain gauge assembly is positioned inside the load cell housing to convert the load acting on them into electrical signals. The weight on the load cell is measured by the voltage fluctuation caused in the strain gauge when it undergoes deformation.

    The gauges themselves are bonded onto a beam or structural member that deforms when weight is applied. Modern load cells have 4 strain gauges installed within them to increase the measurement accuracy. Two of the gauges are usually in tension, and two in compression, and are wired with compensation adjustments.

    When there is no load on the load cell, the resistances of each strain gauge will be the same. However, when under load, the resistance of the strain gauge varies, causing a change in output voltage. The change in output voltage is measured and converted into readable values using a digital meter.
    Piezoresistive load cell
    Similar in operation to strain gauges, piezoresistive force sensors generate a high level output signal, making them ideal for simple weighing systems because they can be connected directly to a readout meter. The availability of low cost linear amplifiers has diminished this advantage, however. An added drawback of piezoresistive devices is their nonlinear output.High Capacity Tension Link Load Cell Miniature load cell
    Inductive and reluctance load cells
    Both of these devices respond to the weight-proportional displacement of a ferromagnetic core. One changes the inductance of a solenoid coil due to the movement of its iron core; the other changes the reluctance of a very small air gap.
    Magnetostrictive load cells
    The operation of this force sensor is based on the change in permeability of ferromagnetic materials under applied stress. It is built from a stack of laminations forming a load-bearing column around a set of primary and secondary transformer windings. When a force is applied, the stresses cause distortions in the flux pattern, generating an output signal proportional to the applied load. This is a rugged sensor and continues to be used for force and weight measurement in rolling mills and strip mills.

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    Strain Gauges: The First Choice for Your Strain Measurement

    February 12, 2022
    in Force Sensors, Load Sensor
    by admin

    Strain gauges (often also referred to as strain gages) are the key asset for measuring fatigue and testing materials for better and safer products. Whether it is in structural durability testing, structural health monitoring, or for the production of OEM transducers, Haina optical and electrical strain gauges are the first choice.

    As one of the leading strain gauge manufacturers, our wide range of strain gauges comprises of an extensive assortment for widely differing strain measurement applications – over 6,000 types of strain gauges are available. Due to the combination of excellent services with a comprehensive range of accessories and over 65 years of experience, Haina is the perfect partner for your strain measurement project.

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    What is a load cell? How does a load cell work?

    February 12, 2016
    in Load Cell, Load Sensor, Sensor, Strain Gauges
    by admin

    Design and function of a load cell
    Load cells are used to measure weight. They are an integral part of our daily life. “In your car or at the cheese counter in the supermarket – we encounter load cells everywhere,” says HAINA Product Manager Evan. Of course they are usually not immediately recognizable, because they are hidden in the inner workings of instruments.

    Load cells generally consist of a spring element on which strain gauges have been placed. The spring element is usually made of steel or aluminum. That means it is very sturdy, but also minimally elastic. As the name “spring element” suggests, the steel is slightly deformed under load, but then returns to its starting position, responding elastically to every load. These extremely small changes can be acquired with strain gauges. Then finally the deformation of the strain gauge is interpreted by analysis electronics to determine the weight.

    To understand this last point, let us consider strain gauges in more detail: They are electrical conductors firmly attached to a film in a meandering pattern. When this film is pulled, it – and the conductors – get longer. When it is contracted, it gets shorter. This causes the resistance in the electrical conductors to change. The strain can be determined on this basis, as resistance increases with strain and diminishes with contraction.

    The strain gauges are firmly attached to the spring element, and therefore undergo the same movements it does. These strain gauges are arranged in what is called a bridge circuit, or more precisely a Wheatstone bridge circuit (see diagram). This means that four SGs are connected “in a ring” and the measuring grid of the force being measured is aligned accordingly.

    If an object is placed on the load cell or suspended from it, the object’s weight can be determined. The intended load for a load cell is always aligned in the direction of the center of the earth, in other words in the direction of gravity. Only that force component of the load should be acquired. That is not the case for force sensors, which are similar in design, and are also frequently specified as “load cells”: They are usually designed to acquire loads that occur in all directions. The direction of the earth’s gravitational force is not relevant to how they are installed.

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    What is a Load Cell? Load Cells How It Works?

    February 12, 2016
    in Load Cell, Load Sensor, Sensor
    by admin

    Geotechnical instrumentation and monitoring is a vast field and it encompasses several sensors that aid in structural health monitoring, landslide monitoring, excavation monitoring, etc.

    Load cells are one such instrument that are commonly used to measure weight. They can measure things as small as a needle to as heavy as big drilling machines. You can find load cells everywhere, even in your nearby grocery stores to weigh your items, though, they are inside the instruments.

    Load cells are available in different shapes, types, and sizes. If you’re curious about what a load cell is and how it works, keep reading to be enlightened.

    Let us discuss more about them along with their types, working principle, advantages, and much more.

    What is a Load Cell?
    A load cell is a transducer that converts the mechanical force into readable electrical units, similar to our regular weighing scales. Their main purpose is to weigh or check the amount of load transferred.

    The load cell sensors are always bonded along with elastic material, known as strain gauges.

    To understand more on them, it is necessary that you must know about strain gauges, their types, working principle, as well as, areas of application.

    What is load cell used for?
    The type of instruments used in the geotechnical field depends on the scope of work. Load cells can be used at the initial stage i.e. during the research and development or even at a later stage while monitoring a structure.

    Geotechnical instruments are used both pre and post-construction to ensure the safety of structures, dams, tunnels, bridges etc. Proper geotechnical monitoring ensures the long-term safety of these structures.

    Load cells find their application in the geotechnical field and, they are commonly used to monitor:

    Deep foundations: excavation bracing like struts, soldier pile; tiebacks or anchors; retaining walls
    Tunnels and shafts: Steel liner plate, cast-in-place concrete, segmented precast concrete, shotcrete
    Dams: Concrete Dams, Underground Power House
    Piles: Pile load test

    What is the working principle of a load cell?
    If you’ve ever wondered how load cell sensors work, here’s your answer!.
    Load cell principle involves the use of many specific geotechnical instruments.It can’t work without being paired up with sensors, one of them being Strain Gauges.

    Strain Gauges are thin elastic materials made up of stainless steel and are fixed inside the load cells using proprietary adhesives. The strain gauge has a specific resistance that is directly proportional to its length and width.

    When a force is applied on the load cell, it bends or stretches causing the strain gauge to move with it. And, when the length and cross-section of the strain gauge changes, its electrical resistivity also gets altered, thereby changing the output voltage.

    There is another concept involved with the working principle of load cells. Let’s have a look aset it.

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    Snippets From The Tech Mobile Conference

    February 12, 2016
    in Load Cell, Pressure Sensor
    by admin

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