The gauges themselves are bonded onto a beam or structural member that deforms when weight is applied. The weight on the load cell is measured by the voltage fluctuation caused in the strain gauge when it undergoes deformation. 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. Disadvantages include relatively slow speed of response and the need for clean, dry, regulated air or nitrogen. Additionally, they contain no fluids that might contaminate the process if the diaphragm ruptures. The advantages of this type of load cell include their being inherently explosion proof and insensitive to temperature variations. Pneumatic load cells are often used to measure relatively small weights in industries where cleanliness and safety are of prime concern. In some designs, the first dampener chamber is used as a tare weight chamber. These devices use multiple dampener chambers to provide higher accuracy than can a hydraulic device. Pneumatic load cells Pneumatic load cells also operate on the force-balance principle. 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. Typical hydraulic load cell applications include tank, bin, and hopper weighing. Because this sensor has no electric components, it is ideal for use in hazardous areas.
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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. Output is linear and relatively unaffected by the amount of the filling fluid or by its temperature. This pressure can be locally indicated or transmitted for remote indication or control. 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.Īs force increases, the pressure of the hydraulic fluid rises. Hydraulic cells are force -balance devices, measuring weight as a change in pressure of the internal filling fluid. 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.) 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 cells find their application in a variety of fields that demand accuracy and precision. They are widely used because of the accuracy with which they can measure the weight. Today, almost all electronic weighing scales use load cells for the measurement of weight. When to use a load cell? A load cell measures mechanical force, mainly the weight of objects. The degree of voltage change is covered to digital reading as weight. Strain gauge load cells contain strain gauges within them that send up voltage irregularities when under load. Strain gauge load sensors are the most commonly used among the three. There are hydraulic load cells, pneumatic load cells, and strain gauge load cells. The inner working of a load cell differs based on the load cell that you choose. How does a load cell work? A load cell works by converting mechanical force into digital values that the user can read and record.
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Strain gauge load cells offer accuracies from within 0.03% to 0.25% full scale and are suitable for almost all industrial applications. 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.
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Although there are many varieties of force sensors, strain gauge load cells are the most commonly used type.Įxcept for certain laboratories where precision mechanical balances are still used, strain gauge load cells dominate the weighing industry. A load cell (or loadcell) is a transducer which converts force into a measurable electrical output.