MR3491 Sensors and Instrumentation: Unit-I Introduction Quiz

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.

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.