Process Engineering Division – Instrumentation and Automation Section – Daily Question – Question dated 2020-08-05
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Process Engineering Division – Instrumentation and Automation Section – Daily Question – Question from 2020-08-05: Discussion question: 197. What is a pressure thermometer, and on what principle does it work?
A pressure thermometer is a type of thermometer that measures temperature based on the relationship between the saturated vapor pressure of a evaporating liquid and temperature within a sealed temperature measurement system.
The principle of this thermometer is based on the relationship between the saturated vapor pressure of a evaporating liquid and temperature within a sealed temperature measurement system, which is used to determine the temperature. When the thermowell detects a change in temperature, saturated vapor within the sealed system generates corresponding pressure, which causes a change in the curvature of the elastic element and results in displacement at its free end. This displacement is then amplified by a gear mechanism to produce an indication value. This type of thermometer features a small thermowell volume, fast response time, high sensitivity, and easy reading; it essentially combines all the advantages of glass rod thermometers, bimetallic thermometers, and gas pressure thermometers. It can be designed to be shock-resistant and corrosion-resistant, and it is capable of transmitting signals such as contact signals, thermal resistance signals, as well as 0-10mA or 4-20mA signals. It is the most widely used and most feature-rich mechanical temperature measuring instrument available today.
A instrument that measures pressure changes with temperature is called a pressure thermometer. It is based on the liquid in a closed system. It is based on the principle that the saturated vapor of a gas or a liquid with a low boiling point expands in volume or experiences a change in pressure when heated; a pressure gauge is used to measure this change, thereby determining the temperature.
A pressure thermometer is a type of thermometer that measures temperature based on the relationship between the saturated vapor pressure of a liquid in vaporization state and temperature within a sealed temperature measurement system
It consists of a thermal bulb, capillaries, and an indicator dial. As the temperature rises, the thermal bulb expands; pressure is transmitted through the capillaries to the pointer dial mechanism, causing the pointer to deflect and indicate the corresponding temperature.
A pressure thermometer is a type of thermometer that measures temperature based on the relationship between the saturated vapor pressure of a evaporating liquid and temperature within a sealed temperature measurement system.
A pressure thermometer is a type of thermometer that measures temperature based on the relationship between the saturated vapor pressure of a liquid in vaporization state and temperature within a sealed temperature measurement system
A pressure thermometer is a type of thermometer that measures temperature based on the relationship between the saturated vapor pressure of a liquid in vaporization state and temperature within a sealed temperature measurement system
Temperature measurement is carried out based on the relationship between the saturated vapor pressure and temperature of the evaporating liquid within a hermetically sealed temperature measurement system
Temperature measurement is carried out based on the relationship between the saturated vapor pressure and temperature of the evaporating liquid within a hermetically sealed temperature measurement system