Podcast
Questions and Answers
Which device is primarily used for low flow measurement and provides the most accurate reading?
Which device is primarily used for low flow measurement and provides the most accurate reading?
- Orifice
- Venturi (correct)
- Displacer
- Rotameter
Which of the following devices measures level by taking differential pressure?
Which of the following devices measures level by taking differential pressure?
- Displacer (correct)
- Venturi
- Thermocouple
- Infrared
What type of output does a Thermocouple produce?
What type of output does a Thermocouple produce?
- Resistance in ohms
- Pressure in psi
- Millivolt signal (correct)
- Voltage in volts
Which instrument is not used for temperature measurement but instead for flow measurement?
Which instrument is not used for temperature measurement but instead for flow measurement?
Which pressure measuring device can provide local analog pressure measurements?
Which pressure measuring device can provide local analog pressure measurements?
What is the primary function of a Thermo-well?
What is the primary function of a Thermo-well?
What is the primary function of a pyrometer?
What is the primary function of a pyrometer?
Which device is most often used for local analog pressure measurement?
Which device is most often used for local analog pressure measurement?
What distinguishes a pressure transmitter from a pressure gauge?
What distinguishes a pressure transmitter from a pressure gauge?
Which of the following is NOT a type of device found inside a pressure gauge?
Which of the following is NOT a type of device found inside a pressure gauge?
What type of measurement does a sight glass provide?
What type of measurement does a sight glass provide?
What is the characteristic of a pressure transmitter's design?
What is the characteristic of a pressure transmitter's design?
Which measurement device is specifically categorized under differential pressure measurement?
Which measurement device is specifically categorized under differential pressure measurement?
What type of device would typically be found on a furnace?
What type of device would typically be found on a furnace?
Which device measures the level using buoyancy?
Which device measures the level using buoyancy?
Which feature is unique to a D/P cell compared to other measurement devices?
Which feature is unique to a D/P cell compared to other measurement devices?
What principle does the Displacer operate on to measure the level?
What principle does the Displacer operate on to measure the level?
Which device provides a visual insight into the process level?
Which device provides a visual insight into the process level?
What type of measurement is primarily provided by the Orifice device?
What type of measurement is primarily provided by the Orifice device?
In which scenario does the Venturi device provide the most accurate readings?
In which scenario does the Venturi device provide the most accurate readings?
Which statement best describes a characteristic of the Thermocouple?
Which statement best describes a characteristic of the Thermocouple?
Among these devices, which one is designed to measure small flow rates effectively?
Among these devices, which one is designed to measure small flow rates effectively?
What is the primary function of the D/P Cell?
What is the primary function of the D/P Cell?
In what form does a Thermocouple signal output into the system?
In what form does a Thermocouple signal output into the system?
What physical principle is utilized by the Sight Glass to measure level?
What physical principle is utilized by the Sight Glass to measure level?
Study Notes
Measurement Devices Overview
-
Float:
- Measures liquid level using a hollow ball that ascends to the surface.
- Operates on two positions to indicate different levels.
-
Sight Glass:
- A transparent tube that shows the fluid level in a process vessel.
- Provides visual access to the process contained within.
-
D/P Cell (Differential Pressure Cell):
- Measures level by gauging the difference in pressure.
- The design features a smaller bottom than the transmitter version, enhancing accuracy.
Flow Measurement Techniques
-
Displacer:
- Determines level by calculating differential pressure based on fluid buoyancy.
- As fluid levels increase, it displaces an indicating arm.
-
Orifice:
- Used for flow measurement with bevel faces downstream.
- Pressure decreases as volume increases; likened to covering a garden hose end.
-
Venturi:
- Employed in low flow measurement for precise readings.
- Creates pressure drop while minimizing pressure loss during measurement.
Temperature Measurement Tools
-
Rotameter:
- Assesses small fluid flows using gravity.
- Commonly found in seal pumps and analyzers, ensuring optimal performance.
-
Thermometer:
- Most prevalent type is J-type, widely used in various applications.
-
Thermocouple, RTD (Resistance Temperature Detector), and Thermowell:
- Generate output signals in millivolts; RTD measures temperature in ohms.
- Thermowell functions as a protective device for temperature sensors.
Pressure Measurement Devices
-
Pressure Gauge:
- Provides local analog pressure readings.
- Can integrate one of three mechanisms: bourdon tube, bellows, or diaphragm.
-
Pressure Transmitter:
- Electronic and pneumatic device used for controlling levels.
- Commonly found in float and level applications.
-
Delta P Transmitter:
- Frequently utilized for various measurement needs in industrial settings.
-
Manometer:
- An older yet reliable method for measuring pressure, often used with furnaces or blowers.
- Indicates slight negative pressure on specific sides.
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