Strain Gauge – Circuit Wiring Diagrams

Strain Gauge Working Principle. Although strain gauges are available in many shapes and sizes, the fundamental working of this device is the same. They also vary in both shape and size according to their field of application. A strain gauge consists of a foil of resistive characteristics, which is safely mounted on a backing material.

A typical excitation voltage for a strain gauge quarter bridge is 2.5 V; Strain applied to the strain gauge creates a bridge voltage output that is relatively low! (0.000125V for 100µm/m strain respectively 0.0025V for 2000µm/m strain). This is visualized in the graphs below for a typical quarter-bridge application.

Wiring diagrams for the installation of strain gauges on bending beam, torsion bar, cylinder or prism for the measurement of the axial force to compensate for lateral forces.

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A strain gauge (also spelled strain gage) is a device used to measure strain on an object. Invented by Edward E. Simmons and Arthur C. Ruge in 1938, the most common type of strain gauge consists of an insulating flexible backing which supports a metallic foil pattern. The gauge is attached to the object by a suitable adhesive, such as cyanoacrylate.

Strain Gage Model Name Coding System Major Properties of KYOWA Strain Gages Strain Gages with Pre-attached Lead-wire Cables Strain Gage Wiring System. A strain gage Wheatstone bridge is configured with a quarter, half, or full bridge according to the measuring purpose. The typical wiring systems are shown in Figs. 4,5 and 6.

This change in resistance is proportional to the applied strain. As this change in resistance is very small in magnitude so its effect can be only sensed by a Wheatstone bridge. This is the basic strain gauge working principle. A circuit diagram is shown in Figure #2. In this circuit diagram, a strain gauge is connected into a Wheatstone bridge.

Most strain gauges are smaller than a postage stamp, and they look something like this: A strain gauge’s conductors are very thin: if made of round wire, about 1/1000 inch in diameter. Alternatively, strain gauge conductors may be thin strips of the metallic film deposited on a nonconducting substrate material called the carrier.

Standard Wiring Diagrams Quarter Bridge Internal Strain Gage Installation Three Wire Lead Color Code and Connections Note: Increasing tension strain in gages induces an increasing signal of positive polarity. Special strain gage with half the grid installed 180° opposite the other half minimizes stray bending effects. FORM S-112A Diagram ...

As you can see in the connections diagram. The four wires of the Load cell or Strain Gauge are connected with the HX711. The four wires of the load cell should be connected in the correct way otherwise this will not work. The red wire of the Strain gauge or Load cell should be connected with the E+ pin of the HX711 break out board.