The working principle and application of atmospheric pressure sensor

Air pressure is the atmospheric pressure acting on a unit area. That is, it is equal to the weight of the vertical air column extending upward to the upper boundary of the atmosphere per unit area.

Due to the Earth’s gravity, the air is “pulled” towards the Earth.

Due to the Earth’s gravity, the air is “pulled” towards the Earth.The Earth’s surface is covered with a thick atmosphere of air. In meteorology, the pressure exerted on a unit area by an atmospheric column per unit area is called atmospheric pressure.

In meteorological studies, it has also been found that vertical pressure decreases with altitude. But people’s perception of atmospheric pressure is not as immediate as changes in the weather, but it is also constantly changing. For example, the air pressure is the highest in winter and the lowest in summer. When the cold wave strikes, the air pressure will rise rapidly. As the cold air passes, the air pressure slowly decreases.

Atmospheric pressure is an important factor in causing weather changes.

Atmospheric pressure is an important factor in causing weather changes. Horizontally, atmospheric pressure is unevenly to distribute, resulting in many different air pressure systems. Air flows from high pressure to low pressure. The water vapor and heat are to exchange everywhere, and this movement causes complex changes in the weather.

Therefore, in modern meteorological research, the accuracy of weather forecast directly affects the national economic life and national defense construction. In order to carry out correct weather analysis and forecast, it is necessary to have correct air pressure data. Therefore, atmospheric pressure monitors have been widely used in meteorological monitoring.

The device or instrument we use to measure barometric pressure is called barometric pressure monitor, barometric pressure sensor or transmitter.

At present, there are many commonly to use atmospheric instruments, which can be to divide into the following categories according to their working principles:

  • Liquid barometer: It is based on the principle of hydrostatics. The atmospheric pressure is to determine by the method of liquid column weight and pressure balance, such as various mercury barometers.
  • Elastic element pressure measuring instrument: use the principle of elastic element and pressure balance to measure atmospheric pressure. Such as various bellows measuring instruments for air pressure.
  • Gas barometer: It is a barometer to make on the basis of the tension of the gas itself acting on the air pressure phase balance.
  • Boiling point barometer: a barometer made by the principle that the boiling point of a liquid changes with the change of the external atmospheric pressure.
  • Solid element barometer: measure atmospheric pressure according to the piezoelectric, piezoresistive and other electrical effects of the element.

The atmospheric pressure transmitter developed by JXCT consists of a measuring element and a microprocessor.

The measuring element causes the measured pressure to act on an area and convert it into displacement or strain. It is then to convert into an electrical signal with a certain relationship to the pressure by the displacement sensitive element or strain gauge.

The JXCT atmospheric pressure transmitter can operate at a temperature of -20℃~60℃. The humidity is 0%RH~80%RH. In the environment where the air pressure is between 0 and 120Kpa, monitor the real-time changes of the air pressure in the place.

The atmospheric pressure transmitter adopts imported high-precision measuring unit.

Built-in high precision temperature compensation. Able to respond within ≤1S time. Accurate measurement of atmospheric pressure with an accuracy of ±0.15Kpa@25℃ 75Kpa. It also has the characteristics of high repeatability, high stability and small drift.

The atmospheric pressure transmitter supports RS485, 4~20mA current and 0~5V/0~10V voltage signal output. The RS485 atmospheric pressure transmitter only outputs the atmospheric pressure value, while the analog signal output transmitter can simultaneously measure the atmospheric pressure and temperature (-40℃~80℃).

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