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Questions and Answers
What is the primary principle of the Displacement or Force Transducers method?
What type of liquids is the Bubbler or Page System method suitable for?
Which method is ideal for closed tanks and vessels?
What is the principle of the Capacitance Variation Type method?
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Which method is best suited for conductive liquids?
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What is the primary component of the Pressure Sensitivity method?
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Which method uses a weighted object partially submerged in the liquid?
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What is the primary application of the Displacement or Force Transducers method?
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Which method measures liquid level by detecting changes in resistance between electrodes?
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What is the primary factor in selecting a liquid level measurement method?
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What is the purpose of the International Temperature Scale (ITS-90)?
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What is the principle of Liquid-in-Glass Thermometers?
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Which of the following is a standard guide for electronic thermometry in contact with liquid water or ice?
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What is the application of Filled System Thermometers?
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What is the principle of Digital Thermometers?
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Which of the following is a standard for medical electrical equipment?
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What is the application of Liquid-in-Glass Thermometers?
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What is the purpose of ASTM E2877-13?
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What is the application of Digital Thermometers?
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What is the significance of temperature measurement in mechanical engineering?
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What is the principle of bimetallic strip thermometers?
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What is the application of gas-filled thermometers?
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What is the principle of thermocouples?
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What type of thermistors have a resistance that decreases with temperature?
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What is the principle of radiation thermometers?
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What is the principle of single float method?
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What is the application of electrical resistance thermometers (RTDs)?
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What type of thermometers are used as calibration standards?
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What is the principle of displacement or force transducers?
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What is the common application of thermistors?
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Study Notes
Temperature Measurements
- International Temperature Scale (ITS-90): defines fixed points using reproducible temperatures for calibration.
- ASTM E2877-13: standard guide for electronic thermometry in contact with liquid water or ice.
- ISO 80601-2-56: standard for medical electrical equipment, defines requirements for non-invasive temperature sensors.
Temperature Measuring Devices
- Liquid-in-Glass Thermometers: measure temperature based on the expansion of liquid (usually mercury or alcohol) in a glass tube.
- Filled System Thermometers: use a liquid-filled system (e.g., gas-filled or liquid-filled bulb) to measure temperature.
- Digital Thermometers: measure temperature using electronic sensors (e.g., thermistors or RTDs) and display the result digitally.
- Bimetallic Strip Thermometers: two metals with different coefficients of thermal expansion bonded together, measure temperature changes by bending.
- Pressure Thermometers: use the relationship between pressure and temperature of a gas or vapor to determine temperature.
- Thermocouples: two dissimilar metals joined at one end, producing a voltage proportional to the temperature difference between the hot and cold junctions.
- Electrical Resistance Thermometers (RTDs): measure temperature based on the change in electrical resistance of a material (usually platinum or nickel) with temperature.
- Thermistors: semiconductor devices whose resistance changes significantly with temperature, with two types: NTC and PTC.
- Radiation Thermometers (Pyrometers): measure temperature by detecting the infrared radiation emitted by an object.
Liquid Level Measurements
- Single Float Method: measures liquid level by detecting the position of a float, simple and cost-effective.
- Displacement or Force Transducers: measures liquid level by detecting the displacement or force exerted by a submerged object.
- Pressure Sensitivity: measures liquid level by detecting the pressure at a specific point, which is proportional to the height of the liquid column.
- Bubbler or Page System: measures liquid level by detecting the pressure required to force gas bubbles through a submerged tube.
- Capacitance Variation Type: measures liquid level by detecting changes in capacitance between two electrodes, suitable for both conducting and non-conducting liquids.
- Resistance Variation Type: measures liquid level by detecting changes in resistance between electrodes, suitable for conductive liquids.
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Description
This quiz covers international standards and guides for temperature measurements, including ITS-90, ASTM E2877-13, and ISO 80601-2-56. It also explores different types of temperature measuring devices, such as liquid-in-glass thermometers.
