Measurement system ppt

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Measurement system ppt

  1. 1. Measurement System Azizco
  2. 2. <ul><li>Measurement System </li></ul>Sensor Processor or Signal Conditioner Display <ul><li>RTD </li></ul><ul><li>Potentiometer </li></ul><ul><li>Strain Gage </li></ul><ul><li>LVDT </li></ul><ul><li>Wheatstone Bridge </li></ul><ul><li>Operational Amplifier </li></ul><ul><li>Digital </li></ul><ul><li>Analog </li></ul>
  3. 3. RTD Sensor Display Processor or Signal Conditioner
  4. 4. Sensor Temperature Change in Resistance R hot = R ref (1 +  (T hot – T cold )) T = 300 ºC R = 580 20 400 .0068 200 716.8 20 300 .0068 200 580.8 20 200 .0068 200 444.8 20 100 ..0068 200 308.8 T ref T hot  Copper R ref R hot
  5. 5. <ul><li>Wheatstone Bridge – a circuit that measures Resistance of Change in resistance. </li></ul>R2 R1 R4 R3 Vs
  6. 6. <ul><li>Wheatstone Bridge – a circuit that measures Resistance of Change in resistance. </li></ul>X Y V X-Y = V out = V out RA RB RD RC Vs
  7. 7. <ul><li>At T ref = 20 ºC ; R 20 = 200  </li></ul><ul><li>At T hot = 300ºC ; R 300 = 580.8  </li></ul><ul><li>RA, RB, RD = 200  </li></ul>R hot = R ref (1 +  (T hot – T cold )) V out = 0.653 V R A R B R D R SG Vs
  8. 8. Sensor RTD Processor Wheatstone Bridge T = 300 ºC R = 580  V out = 0.658 V To Represent 300 ºC the Display should be somehow significant and related T = 300 ºC 300 Sensor Wheatstone B. Amplifier Display T = 300 ºC R = 580  V out = 0.658 V V= 3.00 300 ºC
  9. 9. Sensor Wheatstone B. Amplifier Display T = 300 ºC R = 580  V out = 0.653 V V= 3.00 300 ºC  What is the gain of the Amplifier to give an output of 3.0V from an input of 0.65 Amplifier Gain (A) = Voltage output Voltage input Amplifier Gain (A) = 3.000V 0.653 V A = 4.1 3.00V represent 300ºC
  10. 10. Sensor Wheatstone B. Amplifier Display R = 580  V out = 0.653 V V= 3.00 300 ºC 3.00V represent 300ºC T = 300 ºC Processor
  11. 11. Thank You For Listening

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