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Friday, November 21, 2014

Digital weight Indicator - Strain Gauge

I need some details of a digital weight Indicator.
mail from CA

Digital Weight Indicators and Weighing Scales use Strain Gauges mounted on a Stressed Beam, Cantilever or Plate which is also Elastic, means springs back to old shape.

Digital weight Indicator - Strain_gauge

Strain Gauges are bonded to these plates and connected in a Wheatstone bridge circuit. The output of these are very low, as less as 5mV. These are amplified close to the sensor and usable outputs in volts, like 0-10V are used to display the parameter or control the systems.

Fluids Weights are measure with pressure sensors also. Which also have a mini strain gauge or piezoelectric sensor to convert weight to millivolts.

study these useful links.......

Introduction to Load Cells at Omega

A load cell is a transducer which converts force into a measurable electrical output

LC101 S-Beam Load Cell

S-Beam Load Cells S-Beam load cells get their name from their S shape. S-Beam load cells can provide an output if under tension or compression.

Measuring Strain with Strain Gauges at NI

"The metallic strain gage consists of a very fine wire or, more commonly, metallic foil arranged in a grid pattern."