Temperature and Liquid Level Measurements

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Questions and Answers

What is the principle of operation of a Displacement or Force Transducer?

Measures liquid level by detecting changes in resistance between electrodes

Measures liquid level by detecting changes in capacitance between two electrodes

Measures liquid level by detecting the pressure at a specific point

Measures liquid level by detecting the displacement or force exerted by the displacer (correct)

Which type of liquid level measurement is suitable for corrosive or slurry liquids?

Bubbler or Page System (correct)

Capacitance Variation Type

Resistance Variation Type

Pressure Sensitivity

What is the component that measures the displacement or force exerted by the displacer in a Displacement or Force Transducer?

Air Supply

Transducer (correct)

Electrodes

Pressure Sensor

Which type of liquid level measurement is suitable for conductive liquids?

Resistance Variation Type Signup and view all the answers

What is the principle of operation of a Capacitance Variation Type liquid level measurement?

Measures liquid level by detecting changes in capacitance between two electrodes Signup and view all the answers

Which type of liquid level measurement is suitable for high-pressure and high-temperature applications?

Displacement or Force Transducers Signup and view all the answers

What is the component that measures the pressure required to produce bubbles in a Bubbler or Page System?

Pressure Sensor Signup and view all the answers

Which type of liquid level measurement is ideal for closed tanks and vessels?

Pressure Sensitivity Signup and view all the answers

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

To define fixed points using reproducible temperatures for calibration Signup and view all the answers

What is the principle of operation of a Pressure Sensitivity liquid level measurement?

Measures liquid level by detecting the pressure at a specific point Signup and view all the answers

Which of the following thermometer types is commonly used in laboratory settings?

Liquid-in-Glass Thermometers Signup and view all the answers

Which type of liquid level measurement is suitable for a wide range of liquids, including corrosive and viscous fluids?

Capacitance Variation Type Signup and view all the answers

What is the principle of measurement used in Digital Thermometers?

Electronic sensors (e.g., thermistors or RTDs) and digital display Signup and view all the answers

Which standard guide is used for electronic thermometry in contact with liquid water or ice?

ASTM E2877-13 Signup and view all the answers

What is the application of Filled System Thermometers?

Industrial processes, HVAC systems Signup and view all the answers

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

Expansion of liquid in a glass tube Signup and view all the answers

What is the purpose of ISO 80601-2-56?

To define requirements for non-invasive temperature sensors Signup and view all the answers

What is the application of Digital Thermometers?

Medical, laboratory, and industrial applications Signup and view all the answers

What is the principle of measurement used in Filled System Thermometers?

Use of a liquid-filled system Signup and view all the answers

What is the importance of temperature measurement in mechanical engineering?

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

What is the principle of operation of bimetallic strip thermometers?

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

Which type of thermometer measures the equilibrium vapor pressure of a liquid?

Vapor-pressure thermometer Signup and view all the answers

What is the principle of operation of thermocouples?

Two dissimilar metals joined at one end, producing a voltage proportional to the temperature difference Signup and view all the answers

What is the principle of operation of electrical resistance thermometers (RTDs)?

Measurement of the change in electrical resistance of a material with temperature Signup and view all the answers

What is the principle of operation of thermistors?

Semiconductor devices whose resistance changes significantly with temperature Signup and view all the answers

What is the principle of operation of radiation thermometers (pyrometers)?

Detection of infrared radiation emitted by an object Signup and view all the answers

What is the principle of operation of single float method for liquid level measurement?

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

What is the principle of operation of displacement or force transducers for liquid level measurement?

Measurement of the displacement or force exerted by a submerged object Signup and view all the answers

What is the main factor to consider when selecting a temperature measurement device?

All of the above Signup and view all the answers

Why is accurate liquid level measurement important in mechanical engineering?

For process control, storage tank monitoring, and fluid management 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 various methods of temperature and liquid level measurements, including devices such as thermocouples, thermistors, and pressure thermometers. It also explores different techniques for measuring liquid levels, including float, displacement, and capacitance variation methods.