Strain gauge load cell (Industrial Measurement)

STRAIN GAUGE LOAD CELL

Prepared ByKetan Nayak (140413117005)Harsh Parmar(140413117006)

INDEXSr No TITLE

1. INTRODUCTION

2. TYPE OF LOAD CELLS

3. STRAIN GAUGE LOAD CELL

4. APPLICATIONS

5. LIMITATIONS

INTRODUCTION• Measurement of Weight is an act Performed by our

Ancestors and still it is Performed in our day to day Life.

• Technology also had Taken a Leap in these Years .

• We have Advanced from To•

LOAD CELL• When we hear about Load Cell One thing that comes

into mind is Weight Measurement and the Pointer scale we used in our Earlier Times.

• But now the Question is “What is a Load Cell” ?Load Cell is a Device or an Instrument which Converts the Quantity of Force Applied over it to the Electrical Signal Form.

• There are Many Types of Load Cells Available in Market these Days.

TYPES OF LOAD CELL

ROLE OF STRAIN GAUGE • Strain Gauge acts as the Transducer in the

Strain Gauge Load Cell.

• We can also Say that the Strain Gauge is the Heart of this Load Cell.

STRAIN GAUGE LOAD CELL

WORKING• The principle of operation of the Strain Gauge load cell is based on

the fact that the resistance of the electrical conductor changes when its length changes due to stress.

• Cu Ni alloy is commonly used in strain gauge construction as the resistance change of the foil is virtually proportional to the applied strain.

• The change in resistance of the strain gauge can be utilized to measure strain accurately when connected to an appropriate measuring circuit.

• A load cell usually consists of four strain gauges in a Wheatstone bridge configuration.

• The electrical signal output is typically very small in the order of a few millivolts.

• It is amplified by an Instrumentation amplifier before sending it to the measurement system.

• The output can be Digital or Analog (0-5V) depending on the application.

APPLICATIONSEngineering•Test Rig Force Monitoring•Strain Gauging of Components•Robotic_Weighing of components•Specialized Load cells•General weighing•Machine control•Repair & Calibration

LIMITATIONS1. Calibration is a Tedious Procedure.

2. Mounting Can be Difficult in some Cases.