Temperature Measurement Standards
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Questions and Answers

What is the primary principle of the Displacement or Force Transducers method?

  • Detecting the buoyant force on a weighted object partially submerged in the liquid
  • Measuring the pressure required to force gas bubbles through a submerged tube
  • Detecting changes in capacitance between two electrodes
  • Measuring the displacement or force exerted by a weighted object partially submerged in the liquid (correct)

    • What type of liquids is the Bubbler or Page System method suitable for?

  • Conductive liquids
  • Viscous fluids
  • Corrosive or slurry liquids (correct)
  • Non-conducting liquids

    • Which method is ideal for closed tanks and vessels?

  • Displacement or Force Transducers
  • Capacitance Variation Type
  • Resistance Variation Type
  • Pressure Sensitivity (correct)

    • What is the principle of the Capacitance Variation Type method?

    <p>Detecting changes in capacitance between two electrodes</p> Signup and view all the answers

    Which method is best suited for conductive liquids?

    <p>Resistance Variation Type</p> Signup and view all the answers

    What is the primary component of the Pressure Sensitivity method?

    <p>Pressure Sensor</p> Signup and view all the answers

    Which method uses a weighted object partially submerged in the liquid?

    <p>Displacement or Force Transducers</p> Signup and view all the answers

    What is the primary application of the Displacement or Force Transducers method?

    <p>Chemical processing and oil and gas industries</p> Signup and view all the answers

    Which method measures liquid level by detecting changes in resistance between electrodes?

    <p>Resistance Variation Type</p> Signup and view all the answers

    What is the primary factor in selecting a liquid level measurement method?

    <p>All of the above</p> Signup and view all the answers

    What is the purpose of the International Temperature Scale (ITS-90)?

    <p>To provide a standard for temperature measurement adopted internationally</p> Signup and view all the answers

    What is the principle of Liquid-in-Glass Thermometers?

    <p>Measure temperature based on the expansion of a liquid in a glass tube</p> Signup and view all the answers

    Which of the following is a standard guide for electronic thermometry in contact with liquid water or ice?

    <p>ASTM E2877-13</p> Signup and view all the answers

    What is the application of Filled System Thermometers?

    <p>Industrial processes and HVAC systems</p> Signup and view all the answers

    What is the principle of Digital Thermometers?

    <p>Measure temperature using electronic sensors and display the result digitally</p> Signup and view all the answers

    Which of the following is a standard for medical electrical equipment?

    <p>ISO 80601-2-56</p> Signup and view all the answers

    What is the application of Liquid-in-Glass Thermometers?

    <p>General-purpose temperature measurement and laboratory use</p> Signup and view all the answers

    What is the purpose of ASTM E2877-13?

    <p>To provide a standard guide for electronic thermometry in contact with liquid water or ice</p> Signup and view all the answers

    What is the application of Digital Thermometers?

    <p>Medical, laboratory, and industrial applications</p> Signup and view all the answers

    What is the significance of temperature measurement in mechanical engineering?

    <p>It is critical in various applications, including industrial processes, environmental monitoring, and material testing</p> Signup and view all the answers

    What is the principle of bimetallic strip thermometers?

    <p>Two metals with different coefficients of thermal expansion bonded together</p> Signup and view all the answers

    What is the application of gas-filled thermometers?

    <p>Calibration standards</p> Signup and view all the answers

    What is the principle of thermocouples?

    <p>Two dissimilar metals joined at one end, producing a voltage</p> Signup and view all the answers

    What type of thermistors have a resistance that decreases with temperature?

    <p>NTC thermistors</p> Signup and view all the answers

    What is the principle of radiation thermometers?

    <p>Detecting the infrared radiation emitted by an object</p> Signup and view all the answers

    What is the principle of single float method?

    <p>A float moves with the liquid level, and its position is measured</p> Signup and view all the answers

    What is the application of electrical resistance thermometers (RTDs)?

    <p>Precision temperature measurement</p> Signup and view all the answers

    What type of thermometers are used as calibration standards?

    <p>Gas-filled thermometers</p> Signup and view all the answers

    What is the principle of displacement or force transducers?

    <p>Measuring the displacement or force exerted by a submerged object</p> Signup and view all the answers

    What is the common application of thermistors?

    <p>Medical devices, automotive, and environmental monitoring</p> Signup and view all the answers

    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.

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