Podcast
Questions and Answers
What type of sensor requires no power supply?
What type of sensor requires no power supply?
Which type of sensor detects a stimulus in reference to an absolute physical scale?
Which type of sensor detects a stimulus in reference to an absolute physical scale?
What does an absolute-pressure sensor produce a signal in reference to?
What does an absolute-pressure sensor produce a signal in reference to?
Why do engineers specify sensors in modern process plants?
Why do engineers specify sensors in modern process plants?
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What is the role of the correction element in a measurement system?
What is the role of the correction element in a measurement system?
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Which element produces a signal related to the variable condition of the process being controlled?
Which element produces a signal related to the variable condition of the process being controlled?
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What is the function of the process element in a measurement system?
What is the function of the process element in a measurement system?
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What is the purpose of the comparison element in a measurement system?
What is the purpose of the comparison element in a measurement system?
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What is the purpose of performing an 'as found' check on an instrument?
What is the purpose of performing an 'as found' check on an instrument?
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Why do most modern process plants have sensor calibration programs?
Why do most modern process plants have sensor calibration programs?
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What is involved in a 'Five-point' check calibration?
What is involved in a 'Five-point' check calibration?
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When is re-calibration not required for an instrument?
When is re-calibration not required for an instrument?
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What adjustments are made to move the transmitter output to 4 milliamps and 20 milliamps?
What adjustments are made to move the transmitter output to 4 milliamps and 20 milliamps?
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Why is analog transmitter calibration an iterative process?
Why is analog transmitter calibration an iterative process?
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What is adjusted during digital sensor calibration to reduce errors?
What is adjusted during digital sensor calibration to reduce errors?
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What effect does calibration have on the maximum deviation according to the text?
What effect does calibration have on the maximum deviation according to the text?
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Study Notes
Sensor Types
- A passive sensor requires no power supply.
Absolute Pressure Sensor
- An absolute-pressure sensor detects a stimulus in reference to an absolute physical scale.
- It produces a signal in reference to vacuum.
Sensor Specification
- Engineers specify sensors in modern process plants to ensure accurate process control and safety.
Measurement System Elements
- The correction element in a measurement system corrects for errors and deviations.
- The process element produces a signal related to the variable condition of the process being controlled.
- The process element is the part of the process being measured or controlled.
- The comparison element compares the desired setpoint with the process variable.
Sensor Calibration
- The purpose of performing an 'as found' check on an instrument is to determine its accuracy before calibration.
- Most modern process plants have sensor calibration programs to ensure accuracy and reliability.
- A 'Five-point' check calibration involves checking the instrument at 0%, 25%, 50%, 75%, and 100% of the instrument's range.
- Re-calibration is not required for an instrument if it has not exceeded its specified deviation.
- During analog transmitter calibration, adjustments are made to move the transmitter output to 4 milliamps and 20 milliamps.
- Analog transmitter calibration is an iterative process because it requires multiple adjustments and checks.
- During digital sensor calibration, the digital output is adjusted to reduce errors.
- Calibration reduces the maximum deviation of an instrument, ensuring accurate readings.
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Description
Test your knowledge of sensors and instrumentation with this quiz based on Unit-I Introduction of MR3491 course. The quiz covers topics such as sensor calibration techniques and the importance of calibration in modern process plants.
