Lecture 13 Chemical sensors. 2 of 17 pH sensor pH indicates how acidic or alkaline a solution is pH term translates the values of the hydrogen ion concentration.

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Presentation transcript:

Lecture 13 Chemical sensors

2 of 17 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 alkaline (basic), pH = 7 is said to be neutral.

3 of 17 pH sensor pH is defined as the negative logarithmic value of the Hydrogen ion (H+) concentration pH Ion Concentration (gram equivalent per liter) Type of Solution 01.0 Acid Solution - Hydrogen ions - H Neutral Solution Basic (alkaline) Solution - Hydroxide ions - OH

4 of 17 Examples of substances ProductpH Battery Acid0 HCl in stomach acid1 Lemon juice, vinegar2-3 Orange juice3-4 Acid rain4 Black coffee5 Urine, salvia6 Pure water7 Sea water8 Baking soda9 Ammonia solution10-11 Soapy water12 Bleach13 Oven cleaner13-14 Drain cleaner14

5 of 17 pH sensor

6 of 17 pH sensor - properties electrical resistance of the circuit is very high (around 400M Ω) Temperature dependent Requires regular calibration

7 of 17 pH sensor

8 of 17 Density - tanks

9 of 17 Density - pipes

10 of 17 Density – vibrating fork

11 of 17 Oxygen sensor (Lambda sensor)

12 of 17 Oxygen sensor (Lambda sensor)

13 of 17 Blood glucose sensor

14 of 17 Blood glucose sensor

15 of 17 Heated alcohol sensor

16 of 17 Heated alcohol sensor

17 of 17 Pyroelectric infrared-detector for Gas Analysis