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What I learned after mid-term week 5, 61011195 Anutida Thongchawee -…

- - - - Measure electrical capacitance of a conductive rod
        As process level increase, capacitance increases between the rod and the vessel walls
    - - Conductive
      - Nonconductive
    - - Quick response speed and can measure variety of media
      - Only works witha ground reference point
      - Unaffected by emulsion or rag layers
- - - - Principle
        
        Measure electrical resistance or capacitance that affected by the moisture
      - Types
        
        Capacitive
        
        Measure RH from 0-100%
        
        Resistive
        
        Measure RH below 5%
    - - Used to determine the dewpoint temperature
    - - Principle
        
        Measure the change of length of certain organic or synthetic fiber when these are exposed to a moist atmosphere
    - - Used to determine the dewpoint temperature
    - - Principle
        
        Measure the difference of temperature between wet and dry bulbs
      - Types
        
        Sling Psychrometer
        
        Aspirating Psychrometer
  - - - Principle
        
        Count the time that fluid uses for moving through another container for entire volume of fluid
      - For viscous solution
      - Types of orifice
        
        Furol
        
        Road-oil
        
        Universal
    - - Principle
        
        Timing of the ball through the accurately calibrated distance between two marks on the glass tube
      - For high viscosity fluid
    - - Principle
        
        Count the time that fluid uses for moving through two points
      - Measure absolute viscosity
      - Types
        
        Cannon-Fenske Routine
        
        Ubbelohde
        
        Reverse Flow Viscometers
        
        Dilution Viscometers
        
        Vacuum Viscometers
      - For dilute solution
    - - Principle
        
        Measure the torque required to
        rotate a spindle immersed in a sample liquid
      - Spindle geometries
        
        Cone
        
        Vane
        
        T-bar
        
        Spiral
        
        Cylindrical
        
        Disc
  - - - Electrochemical pH measurement
      - Principle
        
        Nernst equation
        
        The electrical potential created by ions migrating through a permeable membrane causes the difference of voltage between measurement and reference electrodes
    - - Principle
        
        Measure the pH of a solution by color