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?

Detecting changes in capacitance between two electrodes (D) Signup and view all the answers

Which method is best suited for conductive liquids?

Resistance Variation Type (A) Signup and view all the answers

What is the primary component of the Pressure Sensitivity method?

Pressure Sensor (A) Signup and view all the answers

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

Displacement or Force Transducers (D) Signup and view all the answers

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

Chemical processing and oil and gas industries (D) Signup and view all the answers

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

Resistance Variation Type (A) Signup and view all the answers

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

All of the above (D) Signup and view all the answers

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

To provide a standard for temperature measurement adopted internationally (B) Signup and view all the answers

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

Measure temperature based on the expansion of a liquid in a glass tube (C) Signup and view all the answers

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

ASTM E2877-13 (B) Signup and view all the answers

What is the application of Filled System Thermometers?

Industrial processes and HVAC systems (B) Signup and view all the answers

What is the principle of Digital Thermometers?

Measure temperature using electronic sensors and display the result digitally (C) Signup and view all the answers

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

ISO 80601-2-56 (D) Signup and view all the answers

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

General-purpose temperature measurement and laboratory use (C) Signup and view all the answers

What is the purpose of ASTM E2877-13?

To provide a standard guide for electronic thermometry in contact with liquid water or ice (B) Signup and view all the answers

What is the application of Digital Thermometers?

Medical, laboratory, and industrial applications (C) Signup and view all the answers

What is the significance of temperature measurement in mechanical engineering?

It is critical in various applications, including industrial processes, environmental monitoring, and material testing (D) Signup and view all the answers

What is the principle of bimetallic strip thermometers?

Two metals with different coefficients of thermal expansion bonded together (C) Signup and view all the answers

What is the application of gas-filled thermometers?

Calibration standards (C) Signup and view all the answers

What is the principle of thermocouples?

Two dissimilar metals joined at one end, producing a voltage (A) Signup and view all the answers

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

NTC thermistors (D) Signup and view all the answers

What is the principle of radiation thermometers?

Detecting the infrared radiation emitted by an object (D) Signup and view all the answers

What is the principle of single float method?

A float moves with the liquid level, and its position is measured (A) Signup and view all the answers

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

Precision temperature measurement (B) Signup and view all the answers

What type of thermometers are used as calibration standards?

Gas-filled thermometers (D) Signup and view all the answers

What is the principle of displacement or force transducers?

Measuring the displacement or force exerted by a submerged object (D) Signup and view all the answers

What is the common application of thermistors?

Medical devices, automotive, and environmental monitoring (B) Signup and view all the answers

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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.