Principle and application of atmospheric pressure transmitter

Principle and application of atmospheric pressure transmitter

Atmospheric pressure refers to the pressure generated by the air at a certain location on the earth. The air on the earth's surface is affected by gravity, which creates atmospheric pressure. The density of the air layer above the earth is not equal. Because the atmospheric pressure is generated by the gravity of the air, the height of the air column above it is very small, and the density is also very small. Therefore, the higher the distance from the ground, the lower the atmospheric pressure. The denser the air nearby. Under normal circumstances, every time it is lower than 2 kilometers and every time the altitude increases by 12 meters, the atmospheric pressure will drop by 1 mm Hg. The atmospheric pressure sensor or atmospheric pressure transmitter can be used to measure the atmospheric pressure.

Principle of atmospheric pressure transmitter:

We will be able to convert atmospheric weight into telecommunication signal output, and the instrument for us to view the data is called atmospheric pressure transmission Device. The atmospheric pressure transmitter is composed of a measuring element and a microprocessor. The function of the measuring element is to make the measured pressure act on a certain area and convert it into displacement or strain, and then convert it to a certain amount with the pressure by the displacement sensitive element or strain gauge. The electrical signal of the relationship.

Application of atmospheric pressure transmitter:

　

1, use Used as a standard reference in the laboratory. Gauge pressure sensor is not applicable, because when you do experiments, this reference will constantly change (due to different atmospheric pressure, the output of the gauge pressure sensor will be different).　

2. Differential pressure measurement in nuclear facilities. Stability and accuracy are important conditions to ensure the long-term normal operation of the sensor. Once the sensor is damaged, it must be disposed of immediately, and it cannot be repaired and adjusted because it has been contaminated by radiation.　

3. GPS positioning and atmospheric pressure measurement can make mobile phone positioning more accurate. In the past, positioning can only determine a plane coordinate, and the positioning of atmospheric pressure can even be accurate to altitude and floor.

4. Application in agricultural weather station. High pressure often results in dry weather, which often results in reduced agricultural output; low pressure often results in rainy weather, which can alleviate drought, but too much precipitation can also bring floods, affect agricultural production, and bring losses to agriculture. Be aware of changes in atmospheric pressure and take timely measures to protect crops.

5. Altimeter. By measuring the air pressure and then converting it into altitude. The higher the altitude, the smaller the pressure gauge reading.

The atmospheric pressure transmitter RS-QY-N01-2-4 adopts imported high-precision measuring unit, built-in high-precision temperature compensation, with high repeatability and stability It has high performance and low drift characteristics; it can monitor the pressure change in the place of use in real time in an environment where the temperature is between -20°C and 60°C and the humidity is between 0%RH and 80%RH. Its working response time is ≤1S, the air pressure accuracy is ±0.15Kpa@25℃ 75Kpa, and it has the characteristics of rapid response and accurate monitoring.

From the output type, the atmospheric pressure transmitter supports two signal output types: RS485 and analog quantity. The analog quantity type includes 4-20mA current signal output and 0-5V, 0-10V voltage signal output, here is special One thing that needs to be explained is that the atmospheric pressure transmitter with RS485 signal output only outputs the value of atmospheric pressure, while the analog signal output transmitter can achieve the value that can simultaneously measure the atmospheric pressure and temperature (-40℃~80℃), and At the same time, the real-time measurement data of the two are respectively output to the cloud platform or RS-RJ-K monitoring platform.

The atmospheric pressure transmitter supports on-site 10-30V wide DC voltage power supply work. There are two types of shells: a wall-mounted prince shell and a shutter box for outdoor use. These 2 This kind of shell has good sealing performance, waterproof, dustproof, and protection level of IP65. It can monitor atmospheric pressure indoors and outdoors. The equipment can also work normally and stably under harsh environments such as dust, rain and snow.

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