A gas pressure thermometer operates based on Charles's Law or the ideal gas law.

Filling medium: Inert gas (such as nitrogen).

Principle: Based on Charles' Law (volume constant, pressure is directly proportional to absolute temperature).

1.  Wide range: from -80°C to +600°C.
2.  Linear scale: The dial scale is basically uniform, making it easy to read.
3.  Environmental temperature influence: Changes in environmental temperature will affect the gas pressure in the capillary and the gauge, thereby causing additional errors. This is its main drawback.

Gas pressure thermometers are suitable for industrial environments where the temperature range is wide, the precision requirements are not extremely strict, and there is significant environmental vibration.

• Engine and power machinery: Measurement of intake and exhaust temperatures, cooling water temperatures, and lubricating oil temperatures for diesel engines, air compressors, and gas turbines. (Outstanding vibration resistance)
• Thermal systems and boilers: Temperature monitoring of steam pipes, hot air ducts, and boiler equipment. (Wide measurement range advantage)
• Chemical and process industries: On-site temperature indication for large reactors and storage tanks, especially in explosion-proof areas.
• Drying equipment and ovens: Temperature control and display for medium and high-temperature ranges.
• Laboratories and test stands: Cost-sensitive applications requiring wide measurement ranges.

The gas pressure thermometer is a "tough and reliable veteran" in the field of industrial temperature measurement. With its ultra-wide range, linear scale, robust structure and intrinsically safe features, it has found its place in many harsh working conditions. Although it is troubled by environmental temperature errors, its outstanding reliability and cost-effectiveness make it a very practical and economical choice in many heavy industrial applications where precision is not a critical factor. When you need a "tough guy" thermometer that can withstand vibration, has a wide measurement range and does not require power supply, the gas pressure thermometer is worth your consideration.