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What i learned in week 12? - Coggle Diagram

- - - - Sensed differential pressure with an adjustable air pressure which becomes a pneumatic output signal.
  - - - Senses the difference in pressure between two ports and outputs a signal.
      - high DP = high signal
    - - Measuring vacuum
      - Measuring absolute pressure
      - Inferring gas and liquid flow
      - Measuring positive gauge pressure
      - Measuring process vessel clogging
      - Inferring liquid level
  - - - Component
        
        Silicone fill fluid
        
        Sensing diaphragm (moving plate)
        
        Isolating diaphragm
      - Principle
        
        Any difference of pressure causes the diaphragm to flex in the direction of least pressure.
    - - Type
        
        Digital sensor
      - Principle
        
        The tension on each string desired resonant frequency.
        
        The string’s resonant frequency will indicate fluid pressure.
      - Example
        
        “DPharp” pressure transmitters.
    - - Strain gauge + Diaphragm
- - - - The differential pressure transmitter
      - Bubbler systems
    - - Transmitter suppression and elevation!!!
  - - - Detect liquid level by continuouslymeasuring the weight of an object (called the displacer ) immersed in the process liquid.
  - - - Mechanical device
    - - ullage
        
        Being the distance from the top of the vessel to the surface of the process material.
      - Fillage
        
        Measurement from the known height of the vessel.
  - - - Ultrasonic level measurement
      - Radar level measurement
    - - Applications with heavy dust or high temperatures are not well-suited for ultrasonic instruments.
      - A layer of foam on top of a liquid can also disrupt an ultrasonic signal.
  - - - One column being the liquid in the gauge sight glass, the other column being the liquid in the vessel.
      - The level gauge, or sight glass is to liquid level measurement as manometers.
    - - Interface problems
      - Temperature problems