There are many measuring instruments needed in the economic and social fields. In the field of pressure measurement, digital pressure gauges are widely used. For example, in the chemical industry, metallurgy, food, machinery and other fields, the configuration of digital pressure gauges can assist production. However, with the increasing dependence on digital pressure gauges in the production process, more and more types of pressure gauges have appeared on the market. In order to ensure the accuracy of the measurement results of digital pressure gauges, strictly Follow the corresponding operating points to avoid measurement errors caused by operating errors. Based on this, we start with the advantages and disadvantages of digital pressure gauges and analyze the points for attention in the use of digital pressure gauges.
The digital pressure gauge uses the elastic element as the sensitive element to measure and indicate the instrument which is higher than the ambient pressure. It is an online measuring instrument. It uses a long-term battery power supply, no external power supply, easy to install and use.
The digital pressure gauge emerged with the development of information technology. The application of this measuring instrument in the production field can realize the effective measurement of the pressure value. However, due to the wide range of applications of digital pressure gauges, the measurement results are deeply disturbed by many factors. In order to improve the measurement accuracy, in addition to complying with the corresponding operating points, it is necessary to start from the control of these influencing factors to ensure that the digital pressure gauge can play its due role in the measurement. With the significant expansion of the application range of digital pressure gauges, various types of digital pressure gauges have appeared on the market.
Each digital pressure gauge has its corresponding scope of application and key points of operation. In order to improve the accuracy of measurement, it is necessary to pay attention to the management of operating regulations.
Digital pressure gauges have a wide range of applications. As a measuring instrument, measurement of digital pressure gauges has the advantages of stable performance, high precision, and wide application range. When a digital pressure gauge is introduced in related fields to carry out measurement work, the entire measurement operation is relatively simple, because this type of pressure meter is equipped with a digital display screen, and the final display results are more intuitive.
When using the digital pressure gauge to carry out measurement and detection, the measurement of multiple parameters can be completed at the same time. In the process of multi-function measurement and display, different measurement results can be flexibly switched according to needs. The personnel involved in the measurement can be in the During the execution of the measurement work, the maximum and minimum measured values are read. When the digital pressure gauge is selected in the measurement work, the final result is a digital presentation method, which overcomes the deviation caused by the traditional manual reading.
In addition, when using digital manometers to carry out measurement tasks, it is not necessary to maintain the vertical state of the manometer when the entire measurement work is carried out. Compared with traditional manometers, digital manometers have high sensitivity and small errors. With the function of temperature compensation, these characteristics make it possible to obtain relatively reliable measurement results as long as the operation is correct when the digital pressure gauge is used for measurement detection. Even if the measurement work is under relatively high vibration conditions, the results can also be displayed normally.
Although the digital pressure gauge is a key instrument for pressure measurement in the production field, in essence, the digital pressure gauge is an electronic device. It is precisely because of this characteristic that when using a digital pressure gauge for measurement work, the electromagnetic field often affects Work causing a certain amount of interference, resulting in a large deviation between the measurement results and the actual. When digital pressure gauges are used for measurement work, the real-time voltage and battery power will also affect the accuracy of the measurement results. Therefore, it is necessary to adopt effective error control methods during the measurement work to obtain reliable measurement results.
When carrying out the measurement work, the digital pressure gauge is selected. In order to obtain relatively reliable measurement results, it is generally necessary to place the digital pressure gauge in a constant temperature laboratory for at least 2 hours. However, because there are many types of digital pressure gauges on the market, The selection and determination of the measured temperature should be determined according to the level of the digital pressure gauge. According to the user experience of digital pressure gauges, for digital pressure gauges of grades 0.01, 0.02, 0.05, and 0.1, the best ambient temperature is generally maintained in the range of 18-22°C, while for grades 0.2, 0.5, 1.0 and 1.6 digital pressure gauges, these levels of pressure gauges, the ambient temperature should be slightly higher, kept at 15 ~ 25 ℃.
When using the digital pressure gauge, it is necessary to ensure a reliable connection between the pressure gauge and the verification device. Before the formal measurement work is carried out, the pressure gauge needs to be energized and preheated for a period of time. When the measurement work of the digital pressure gauge is carried out, if it is gas detection, there are strict standards for medium selection. It is best to use clean and non-corrosive gas. If it is the liquid measurement, a clean and non-corrosive liquid or gas medium can be used.
In order to use the digital pressure gauge to obtain more accurate results, before the formal measurement work begins, it is necessary to arrange for a special person to be responsible for adjusting the verification device and the digital pressure gauge and try to ensure that the pressure points of the two are at the same level. When the work was carried out, it was not adjusted in time, the pressure point of the verification device and the digital pressure gauge were not on the same level, and there was a certain error in the measurement result compared with the actual one. This error is the added value of the measurement error. When the measurement additional error correction value exceeds 10% of the allowable error value of the digital pressure gauge, in order to obtain relatively reliable results and use the measurement results for production improvement, it is necessary to implement error correction.
Digital pressure gauges have multiple accuracy levels, which are important factors that determine the number of measurement cycles and measurement points. According to the application experience of digital pressure gauges in various fields, for digital pressure gauges of 0.01, 0.02, and 0.05, the cycle Twice, each measurement point should be evenly distributed within the range, including the zero point, there must be at least 10 measurement points. For digital pressure gauges below grade 0.1, cycle once and at least 5 measurement points including zero point.
When using digital pressure gauges to carry out measurement work, there are strict requirements for stability. Before the measurement work officially starts, relevant personnel must carry out verification work according to the stability standards of digital pressure gauges in relevant national regulations. As far as the existing regulations are concerned, for digital pressure gauges above grade 0.05, the change in indication value between two adjacent verification cycles should not exceed the absolute value of the maximum allowable error, otherwise, once the standard cannot be met, use the digital pressure gauge The measurement work carried out according to the plan, the measurement results obtained are invalid.
The digital characteristics and automatic control function of the digital pressure gauge. When using digital pressure gauges to carry out measurement work, attention should be paid to the mastery of automatic control functions. Relevant personnel need to have a clear understanding of control principles, control methods, and control technical indicators to avoid interference with results due to improper operation.
There are many types of digital pressure gauges on the market. These different digital pressure gauges often have certain differences. These differences are an important basis for selecting the pressure transmission medium. Scientific selection will not only fail to obtain accurate measurement results, but may even cause damage to the digital pressure gauge in some special cases. Therefore, no matter what type of digital pressure gauge is selected in the measurement, it is necessary to pay attention to the scientific selection of the pressure transmission medium, and select the most matching pressure transmission medium according to the regulations in the instruction manual.
When digital pressure gauges are used for measurement work, some pressure transmission media often contain oil or other sundries. In order to avoid the impact of these sundries on the measurement results, the pressure transmission media will be regularly filtered and replaced, but these methods cannot be used from If the problem is solved at the source, the accuracy of pressure measurement cannot be guaranteed. Therefore, with the new requirements for the pressure transmission medium in the use of digital pressure gauges, it is necessary to remove oil and debris pollution when the pressure transmission medium is used. According to the research on chemical aspects, different types of pressure filters have appeared on the market.
There are two types of pressure transmission media used in pressure testing: gas and liquid. For gas media, oil pollution is the most common pollutant, while the pollutants in liquid media are mainly dirt and impurities. In order to ensure the decontamination effect of the pressure transmission medium, the following factors should be integrated when selecting a filter.
The filtration accuracy of the filter refers to the filtering degree of the filter itself to the pollutant particles in the gas or liquid medium. When the media conditions are different when the digital pressure gauge is used, it is necessary to select the corresponding filter accuracy. filter.
The ability of the filter to excrete the filtrate is the scale removal ability of the filter. Usually, the scale removal ability of the filter is directly related to the order of operation. As long as the corresponding standards are followed during the operation, the scale removal Ability is ideal.
As an important part of the filter, the filter chamber can accommodate the amount of filtered matter that represents the dirt-holding capacity of the filter. When the filter's dirt-free capacity is large, it means that the digital pressure gauge is used to carry out metering work. , the interval between removing and washing the filter is longer. The content and excretion of oily impurities are the key factors affecting the capacity of dirt and dirt.
In the measurement work of digital pressure gauges, the measurement results will also be disturbed by environmental factors, such as temperature and humidity, electromagnetic interference, airflow, and atmospheric pressure. Among the influences of these environmental factors, the influence of temperature is the greatest. Therefore, it is necessary to strengthen the control of the ambient temperature when using a digital pressure gauge to carry out measurement work.
For some special digital manometers on the market, the interference of battery voltage should also be considered during use, such as battery-powered portable digital manometers or handheld digital manometers, when the battery voltage is higher or lower than the specified standard, All will lead to the deviation of the measurement results from the actual.
As a popular digital pressure gauge in the market, in order to ensure that the digital pressure gauge can play its functional advantages in the measurement work, it is necessary to strictly abide by the operating points when using the digital pressure gauge to carry out measurement and detection, improve the standardization of operation, and obtain accurate, Effective measurement results.