Podcast
Questions and Answers
What is the term for the condition when two controllers are influencing each other's outputs?
What is the term for the condition when two controllers are influencing each other's outputs?
In a controller labeled FIC 101, what does the letter 'I' represent?
In a controller labeled FIC 101, what does the letter 'I' represent?
When switching a controller from manual to automatic, which factors must be aligned before transitioning?
When switching a controller from manual to automatic, which factors must be aligned before transitioning?
What is the definition of 'process variable' in the context of instrumentation?
What is the definition of 'process variable' in the context of instrumentation?
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If a pneumatic signal of 6psi is sent to an 'air to close' valve, what is the resulting valve position?
If a pneumatic signal of 6psi is sent to an 'air to close' valve, what is the resulting valve position?
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What does the term 'process error' refer to in instrumentation?
What does the term 'process error' refer to in instrumentation?
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In a control system, what do the letters 'F', 'I', and 'C' represent in the controller designation FIC 101?
In a control system, what do the letters 'F', 'I', and 'C' represent in the controller designation FIC 101?
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What is the main purpose of a cascade control system?
What is the main purpose of a cascade control system?
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Which of the following best describes a control loop component found in a closed control system?
Which of the following best describes a control loop component found in a closed control system?
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When operating in automatic mode, what primarily influences the position of the valve?
When operating in automatic mode, what primarily influences the position of the valve?
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Study Notes
Controller Modes
- Output controls the valve in manual mode
- Setpoint controls the valve in automatic mode
Cascade Control
- One controller controls the output of another controller
Process Error or Offset
- The difference between the setpoint (SP) and the process variable (PV) display
Controller Identification
- FIC 101 - F stands for flow, I stands for indicator, C stands for control, 101 is the control loop number
- Process variable - indicates the actual status of the process
- Setpoint - indicates the desired state of the process
Switching Modes
- When switching from manual to automatic control, the process variable and the setpoint should be aligned
Instrument Control Loop
- Closed instrument control loop instruments include: sensor, transmitter, controller, final control element (fce)
Pneumatic Signal
- A 6psi pneumatic signal sent to an “air to close” valve results in 75% valve opening
Controllers
- When a controller is in manual, the output controls the valve.
- When a controller is in automatic, the setpoint controls the valve.
- When one controller controls the output of another controller, this is called cascade control.
- Process error or offset is the difference between the setpoint (SP) and the process variable (PV).
- When switching from manual to automatic control, the operator should ensure that the process variable and the setpoint are in line with one another.
Instrumentation
- FIC 101: F stands for flow, I stands for indicator, and C stands for control. 101 is the control loop number.
- Process variable is the actual status of the process and indicates where the process is.
- Setpoint is the desired state of the process, indicating where you want the process to be.
- Instruments in a closed instrument control loop include: sensor, transmitter, controller, and final control element (FCE).
Pneumatics
- A 6psi pneumatic signal sent to an "air to close" valve results in 75% valve opening.
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Description
Test your knowledge on control systems, focusing on controller modes, cascade control, and process error identification. This quiz covers key concepts related to instrument control loops and the components involved. Perfect for students and professionals in engineering and automation.
