The role of the pressure gauge is to detect pressure, so the measurement object is pressure. Therefore, we should start from the meaning of the pressure gauge and clarify its working principle to focus on analyzing the data discrepancies that occur in the pressure gauge under the influence of temperature and then put forward effective coping strategies.
In addition, we should combine scientific judgment with the decision to rectify the situation actively, minimize measurement data errors and improve the effectiveness of measurement testing. Today, we will discuss how temperature affects pressure gauge measurement data.
1. The meaning of a pressure gauge
In practice, we can choose a pressure gauge for different purposes. There are two main types of pressure gauges: a digital pressure gauge and an electric contact pressure gauge.
Pressure gauges are seen by many as the eyes of industrial production and have an essential impact on industrial production. Therefore, using the correct pressure gauge to measure accurate data for reference is crucial.
2. The influence of temperature changes on the pressure gauge test results
In the working process, pressure gauges are usually special instruments. Because pressure gauges are often in contact with the outside world, these external factors sometimes cause the pressure gauge measurement data inaccurate.
The working principle of the pressure gauge and its operational performance can vary due to temperature changes, and errors in the test data also occur. The pressure gauge will also appear entirely out of calibration in severe cases. These factors deserve attention; if no active measures are taken, it will cause economic losses.
When pressure gauges lose their ability to measure data, we must pay attention to them to ensure their work’s effectiveness and improve under temperature changes.
2.1 Effect of temperature changes on pressure gauges
When we are testing external pressures, we use pressure gauges. When the external force changes, the internal components are sensitive to the sensations and thus produce elastic changes. The position of the pointer in the gauge changes as a result of these pressure changes.
2.1.1 The influence of temperature on the accuracy of the pressure gauge
We can find in practical measurements that if the temperature rises, the amount of elastic change decreases.
As the temperature rises gradually, the element is deformed. If the external temperature falls, the internal component material variation decreases, and the measured pressure value becomes smaller.
As can be seen, when the temperature changes, the elastic variables naturally change, and the sensitivity of the element and its accuracy also change.
2.1.2 External temperature changes
As seen above, the external temperature must stay the same when using a pressure gauge. However, it is impossible and unachievable to fix the outside temperature. Therefore, it is impossible to control the outside temperature, but it is necessary to consider the environmental pressure changes.
2.1.3 Measurement errors in pressure gauges
Pressure gauges are also subject to pressure errors. The state has made clear plans for using pressure gauges to reduce the errors, limiting the range of pressure errors.
If the measurement error is less than one-third of the tested value, we can judge the pressure value as accurate. However, in practice, the temperature in the laboratory cannot be guaranteed to be constant. Therefore, the measurement error is often outside the limits, so the results are often inaccurate. It is why measurements are constantly calculated to ensure that the results are accurate.
2.2 temperature change and the relationship between the modulus of elasticity.
In the process of temperature change, the pressure gauge’s modulus of elasticity will change, and in a particular order of law. The relationship is Et = E0 (1 – E × public t).
Where Et for the temperature at t when the elastic element of the elastic modulus, the unit is (kg/mm 2). E0 for the flexible part of the elastic modulus at room temperature (20 ℃), the team is (kg/mm 2). E for the temperature coefficient of the elastic modulus. △ t for the temperature change, the public t is t and t0 difference.
In summary, Et and temperature interact and are inversely related. When the elastic element is subjected to the same pressure, the deformation process is proportional to the temperature. Therefore, the data displayed on the pressure gauge is also proportional to the temperature.
Therefore, to further analyze the accuracy of the pressure gauge. We should start with temperature control and carry out tests at the appropriate temperature to improve the accuracy of the measured values.
Combining the interrelationships, we can make it clear: at standard temperatures. The pressure gauges can be made more accurate. The operator must consider temperature variations during the setting process and prioritize them.
2.3 Problems with pressure gauges in measurement
First of all, the analysis is based on the measurement of temperature. We must check spring tube pressure gauges to clarify the integrity between the individual original parts.
More importance must be attached to the objective fact that problems due to loose appearance and slipping of parts are avoided. Once issues are found, they should be actively repaired or replaced.
2.3.1 Checking for abnormalities in the pressure gauge
In the working operation, we should strictly check that the appearance is uniform and that the layers are not detached from each other, and actively deal with problems once they are found.
We should carefully manage the dust protection of the pressure gauge. And if necessary, we should install dust guards, set up safety dust holes, etc.
2.3.2 Confirmation of the markings of the pressure gauge
Depending on the pressure gauge for the measured medium, we have to check whether there is a standard color code. Secondly, the markings on the dial of the spring tube pressure gauge are checked to ensure that the quality of the appearance, the production unit and the number, the unit of measurement, etc., are complete.
2.3.3 Confirmation of pressure gauge numbers
Many manufacturers use direct handwritten numerals, but because of the long-term use of the pressure gauge or the influence of the environment. As a result, the handwritten digits are subjected to wear and tear. Measurements in such cases directly increase the difficulty of the test work, and the test data is difficult to ensure accuracy.
While managing the pressure gauge, we should actively check the pressure gauge readings and the clarity of the numbers, all of which should be strictly observed. We also check whether the transparent glass is damaged.
In addition, in some unique environments. We should more actively clean the process of using pressure gauges to ensure cleanliness and do an excellent job of temperature control so that valuable data can be derived, only to improve the measurement efficiency.
Pressure gauges are used in many industries. However, no matter which kind of pressure gauge we use, there will be data differences due to temperature changes. Therefore, when we use pressure gauges, we must combine the actual development, carefully analyze and conclude the pressure gauge operation efficiency.
The relevant technical departments should even actively carry out technical research and development to improve and perfect the performance of the pressure gauge and thus ensure the accuracy of the data under temperature changes.
Also, further realize the safety of production, establish a safe and reliable operating environment for its products and bring new experiences to the people.