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Lecture 13

Lecture 13. Chemical sensors. pH sensor. pH indicates how acidic or alkaline a solution is pH term translates the values of the hydrogen ion concentration Solutions with pH < 7 are acidic, with pH > 7 alkaline (basic), pH = 7 is said to be neutral. pH sensor.

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Lecture 13

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  1. Lecture 13 Chemical sensors

  2. pH sensor • pH indicates how acidic or alkaline a solution is • pH term translates the values of the hydrogen ion concentration • Solutions with pH < 7 are acidic, with pH > 7 alkaline (basic), pH = 7 is said to be neutral.

  3. pH sensor • pH is defined as the negative logarithmic value of the Hydrogen ion (H+) concentration

  4. Examples of substances

  5. pH sensor

  6. pH sensor - properties • electrical resistance of the circuit is very high (around 400M Ω) • Temperature dependent • Requires regular calibration

  7. pH sensor

  8. Density - tanks

  9. Density - pipes

  10. Density – vibrating fork

  11. Oxygen sensor (Lambda sensor)

  12. Oxygen sensor (Lambda sensor)

  13. Blood glucose sensor

  14. Blood glucose sensor

  15. Heated alcohol sensor

  16. Heated alcohol sensor

  17. Pyroelectric infrared-detector for Gas Analysis

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