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After midterm week 5 - Coggle Diagram

- - - - The gauge port must be installed on the region of the existing of fluid to reduce the interface problem
    - - The temp in the vessel is unequal to the sight glass will change the properties of steam causing the error of specify process level
- - - - The equation of F = (P1-P2)/A used toonfer the different pressure
      - Capacitance between two conductors can write as form c=Aε/d
    - - The resonance frequency can describe by f= 1/2L √(FT/μ)
      - The string as a forces sensors will oscillate and connected with oscillator to measure the resonance frequency for infer the fluid pressure
      - The DPharp is the most morden pressure transmitters by Yokogawa, Japan
    - - Must be bonded on to a larger specimen
      - Infer the amount of pressure by compress of stretch on the specimen
        
        Use proportional of R∝I/A to measure the pressure
  - - - Differential pressure is sensed by liquid-filled diaphragm
      - Baffle and Nozzle will sense and causes a pneumatic amplifier
      - The bellows presses against the rang bar
      - Convert the pneumatic to electronic force-alancing
  - - - Use in conjunction with external mechanism
    - - Common to use
      - Made in spiral or helical forms for greater motion
    - - Constructed from metal
      - Increase pressure causes it to elongate
  - - - Type
        
        Pneumatic
        
        Electronic
      - The transmitters has two pressure ports to sense different process fluid pressure divided into high and low port
    - - One instrument may be used to measure
        
        Positive (gauge) pressures
        
        Negative (vacuum) pressures
        
        Pressure differences
        
        Absolute pressure
        
        Process vessel clogging
        
        Infer gas and liquid flow
    - - Inferring liquid level