Podcast
Questions and Answers
What is the primary use of a Venturi transmitter?
What is the primary use of a Venturi transmitter?
- Pressure drop measurement
- High flow measurement
- Level measurement
- Low flow measurement (correct)
Which statement is true regarding RTD measurements?
Which statement is true regarding RTD measurements?
- RTD typically measures flow rates
- RTD measures temperature in ohms (correct)
- RTD measures pressure in millivolts
- RTD operates only in high temperature ranges
What type of measurement does a Rotameter primarily perform?
What type of measurement does a Rotameter primarily perform?
- Level measurement
- Pressure measurement
- Temperature measurement
- Small flow measurement (correct)
Which device is a protective device used in temperature measurement?
Which device is a protective device used in temperature measurement?
Which of the following offers a local analog pressure measurement?
Which of the following offers a local analog pressure measurement?
What does a sight glass measure?
What does a sight glass measure?
How does a displacer measure level?
How does a displacer measure level?
Which device is primarily used for flow measurement?
Which device is primarily used for flow measurement?
Which statement about a Venturi is correct?
Which statement about a Venturi is correct?
What is a common application of a rotameter?
What is a common application of a rotameter?
What output signal do thermocouples typically produce?
What output signal do thermocouples typically produce?
Why is a thermometer commonly used in industrial settings?
Why is a thermometer commonly used in industrial settings?
What does a manometer specifically measure?
What does a manometer specifically measure?
Which device is known for measuring temperature only above absolute zero?
Which device is known for measuring temperature only above absolute zero?
What characteristic distinguishes a pressure transmitter from other pressure measurement devices?
What characteristic distinguishes a pressure transmitter from other pressure measurement devices?
What type of pressure gauge can include bourdon tape, bellows, or diaphragm in its construction?
What type of pressure gauge can include bourdon tape, bellows, or diaphragm in its construction?
What is the primary function of a sight glass in process measurement?
What is the primary function of a sight glass in process measurement?
Which device can only read surface temperature and has a limited range of operation?
Which device can only read surface temperature and has a limited range of operation?
Which of the following devices is an older type of pressure measuring instrument still in use today?
Which of the following devices is an older type of pressure measuring instrument still in use today?
What does a float measure in level measurement?
What does a float measure in level measurement?
What does a D/P cell measure?
What does a D/P cell measure?
Which temperature measuring device is typically used for rotating equipment?
Which temperature measuring device is typically used for rotating equipment?
Study Notes
Measurement Devices Overview
- Float: Measures liquid level with a hollow ball rising to the surface. Operates in two positions.
- Sight Glass: Measures liquid level and provides a visual window into the process within a glass tube.
- D/P Cell: Measures level by assessing differential pressure, with a smaller bottom than the transmitter version.
Flow Measurement Devices
- Displacer: Measures levels through buoyancy, displacing an arm as liquid levels rise, providing differential pressure readings.
- Orifice: Measures flow with bevel faces oriented downstream, creating pressure changes as volume increases.
- Venturi: Offers precise measurements in low flow scenarios, smoothes displacement for minimal pressure loss.
Temperature Measurement Instruments
- Rotameter: Ideal for measuring small flow using gravity, commonly found in seal pumps and analyzers.
- Thermometer: Most common is the J type, measuring temperature which can also be output via thermo-well.
- Thermocouple & RTD: Both produce millivolt output signals; RTD measures temperature in ohms, while thermo-well provides protective casing.
Specialized Temperature and Pressure Devices
- Pyrometer: A portable handheld thermometer that detects surface temperatures, limited to a 100-foot range.
- Infrared: Measures temperatures above absolute zero, suitable for non-contact assessments.
- Pressure Gauge: Provides local analog pressure measurements utilizing bourdon tape, bellows, or diaphragm mechanisms.
Transmitters for Process Control
- Pressure Transmitter: A pneumatic electronic device regulating pressure in float and level systems.
- Delta P Transmitter: Commonly used in various float and level applications to monitor fluid levels effectively.
- Manometer: An older pressure measurement device seen in furnaces and blowers, operating with slight negative pressure readings on specific sides.
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