Podcast
Questions and Answers
What is the primary mechanism used by a potentiometric pressure sensor to convert pressure into an electrical signal?
What is the primary mechanism used by a potentiometric pressure sensor to convert pressure into an electrical signal?
- Moving a wiper arm on a resistive element (correct)
- Changing the resistance of a strain gauge
- Varying the inductive coupling between the transformer primary and secondary
- Generating a piezoelectric charge
What is a major disadvantage of potentiometric pressure sensors?
What is a major disadvantage of potentiometric pressure sensors?
- Repeatability and Hysteresis Errors - Low Performance (correct)
- High cost
- Sensitivity to temperature changes
- Limited range of measurement
What is the principle of operation of an inductive pressure sensor?
What is the principle of operation of an inductive pressure sensor?
- Using the LVDT of a moving core to vary the inductive coupling between the transformer primary and secondary (correct)
- Generating a piezoelectric charge
- Moving a wiper arm on a resistive element
- Varying the resistance of a strain gauge
Which type of pressure sensor uses a piezoelectric material to generate a charge in response to pressure changes?
Which type of pressure sensor uses a piezoelectric material to generate a charge in response to pressure changes?
What is a critical consideration in instrumentation design when using pressure sensors?
What is a critical consideration in instrumentation design when using pressure sensors?
Which type of pressure sensor is commonly used in industrial applications where high accuracy and precision are required?
Which type of pressure sensor is commonly used in industrial applications where high accuracy and precision are required?
What type of pressure sensor is used when it is not possible to have the sensor directly open to the reference pressure?
What type of pressure sensor is used when it is not possible to have the sensor directly open to the reference pressure?
What does the maximum pressure of a sensor indicate?
What does the maximum pressure of a sensor indicate?
What is the primary function of an absolute pressure sensor?
What is the primary function of an absolute pressure sensor?
What is the difference between the maximum pressure that the sensor can measure and zero pressure?
What is the difference between the maximum pressure that the sensor can measure and zero pressure?
What type of pressure sensor measures the difference in pressure between two points in a system?
What type of pressure sensor measures the difference in pressure between two points in a system?
What does the sensor type specify in a pressure sensor?
What does the sensor type specify in a pressure sensor?
What is the typical size of a sensor chip?
What is the typical size of a sensor chip?
What is the purpose of providing the operating pressure range of a sensor?
What is the purpose of providing the operating pressure range of a sensor?
What type of pressure sensor provides a pressure measurement relative to the local atmospheric pressure?
What type of pressure sensor provides a pressure measurement relative to the local atmospheric pressure?
What does the output type of a pressure sensor describe?
What does the output type of a pressure sensor describe?
What type of sensor is used to measure pressure?
What type of sensor is used to measure pressure?
What is the primary advantage of piezoelectric pressure sensors?
What is the primary advantage of piezoelectric pressure sensors?
Study Notes
Parts of a General Purpose Pressure Sensor
- A pressure sensor consists of a sensing element, signal conditioning, and output stages.
Piezoelectric Pressure Sensor
- Uses piezoelectric materials to generate an electric charge in response to changes in pressure.
Pressure Sensors
- There are different types of pressure sensors, including potentiometric, inductive, piezoresistive, and IC sensors.
Potentiometric Pressure Sensors
- Uses a Bourdon tube, capsule, or bellows to drive a wiper arm on a resistive element.
- Advantages: Relatively inexpensive sensors used for coarse measurements.
- Disadvantages: Repeatability and hysteresis errors, low performance.
Inductive Pressure Sensors
- Uses the LVDT of a moving core to vary the inductive coupling between the transformer primary and secondary.
Piezoresistive Sensors
- Also known as IC sensors, solid-state sensors, or monolithic sensors.
- Use a single-crystal silicon sensor chip, typically 80 × 80 mils or 2 mm × 2 mm in size.
Pressure Sensing Methods
- There are three main methods: absolute, gauge, and differential pressure sensing.
Absolute Pressure Sensors
- Provide a pressure measurement relative to a reference of zero pressure, which is as close as possible to a vacuum.
Gauge Pressure Sensors
- Provide a pressure measurement relative to the local atmospheric pressure.
Differential Pressure Sensors
- Measure the difference in pressure between two points in a system.
Sealed Pressure Sensors
- Used when it is desired to obtain a pressure measurement relative to a reference value, but where it is not possible to have the sensor directly open to that reference pressure.
Pressure Sensor Specifications
- Sensor type reflects the pressure type for which the sensor is designed to operate.
- Operating pressure range provides the range of pressures over which the sensor can operate and generate a signal output.
- Maximum pressure is the absolute maximum value of pressure in which the device can reliably function without damaging the sensor.
- Full scale is the difference between the maximum pressure that the sensor can measure and zero pressure.
- Output type describes the general nature of the output signal characteristics from the pressure sensor.
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Description
Test your knowledge of pressure sensors, including general purpose pressure sensors, piezoelectric pressure sensors, and types of electronic pressure sensors. This quiz covers the basics of instrumentation in engineering.
