Pressure thermometer is a thermometer based on the principle that when an object is heated or cooled, its volume, length, area, etc. will change, which will cause pressure changes. This article will introduce the basic principles, characteristics, design principles and application scenarios of pressure thermometers, and look forward to its future development.
1. application
Pressure thermometer is a kind of widely used in industrial production, laboratory research and daily life and other occasions of temperature measurement instrument. The basic principle is to use the principle that when an object is heated or cooled, its volume, length, area, etc. will change, which will cause pressure changes. Pressure thermometer has the advantages of simple structure, accurate measurement, fast response and good stability, so it has a wide range of applications in the field of temperature measurement.

2. analysis
Compared with traditional thermometers, pressure thermometers have the following advantages:
Accurate measurement: The temperature sensing element of the pressure thermometer is in direct contact with the measured medium, so it can quickly and accurately sense temperature changes.
Fast response speed: The heat exchange speed between the temperature sensing element of the pressure thermometer and the measured medium is faster, so it has a faster response speed.
Good stability: Since the temperature sensing element of the pressure thermometer does not react with the measured medium, its stability is good and it is not easy to be affected by pollution and corrosion.
Simple structure: The structure of the pressure thermometer is relatively simple, and the manufacturing and maintenance costs are low.
However, pressure thermometers also have some disadvantages:
Easily affected by pressure fluctuations: Pressure thermometers calculate temperature changes by measuring pressure changes, so they are easily affected by external pressure fluctuations.
High requirements for flow rate: pressure thermometer requires the measured medium to have good convective, so that it can evenly contact the temperature sensing element.
The measuring range is limited: the measuring range of pressure thermometers is usually narrow, and can only be measured between -80 ℃ and 200 ℃.

3. Design
The design principle of pressure thermometer mainly includes the following aspects:
Material selection: The temperature sensing element of the pressure thermometer should be selected with good thermal response, corrosion resistance and high stability, such as copper, nickel, platinum, etc.
Manufacturing: In the manufacturing process, the accuracy and smoothness of the temperature sensing element must be ensured to reduce errors and improve heat exchange efficiency.
Installation: During installation, it is necessary to ensure that the temperature sensing element is in full contact with the measured medium, and at the same time to prevent the influence of external pressure fluctuations on the measurement results.
Usage: During use, attention should be paid to keeping the instrument clean and dry, and regular calibration and maintenance should be carried out to ensure measurement accuracy and service life.