Influence of accuracy and resolution of diaphragm pressure gauge on measurement accuracy

For things that look like a thousand years, there is confusion between correctness and solution. These two terms are usually used interchangeably, especially when referring to measurement and instrument. But accuracy and resolution are completely different in meaning, so we should reflect this difference in use. Let's take a look at the basic example and see if our diaphragm pressure gauge can sort out this difference.

Resolution.

Resolution is the granularity and accuracy of the display. Basically, the resolution represents the number of identical components used in the display. Consider the picture resolution when reading this article. Usually the number of pixels representing so many pixels, a single pixel is a small unit of the display. Small pixels mean higher resolution in the same area.

A simple example that we are familiar with is the analog watch. The resolution of a watch depends on the number of hands and the number of boundaries on the surface. There are 60 dividing lines and 3-hand clocks (hours, minutes and seconds, unless your clock is made by Dr. Seuss). The resolution is 1 second, but there are 60 dividing lines, and only 2-hand clocks have 1 minute. By extension, there are 60 boundaries, and only one hand clock has a resolution of 12 minutes. The reading (time clock) can only be known according to the small display unit.

Taking industrial application as an example, the resolution of a digital pressure gauge with 50.00psi0psi and 0 psi is 0.01psi (2 decimal places). This is a count of 5000 equal parts (or a count of 5000 numbers, but this is another day's blog). Digital meters with a display of 60.00psi have the same resolution of 0.01psi, but 6000 digital counts are not 5000.

This is the reason for the confusion. Just because a digital instrument displays readings in increments of 0.01 does not mean that the instrument is correct to 0.01psi. The same logic applies to clocks: a clock may show seconds, but that doesn't mean it shows the correct time. In order to explain the accuracy of measurement, we turned to accuracy.

Accuracy.

Accuracy indicates the closeness between the measured value and the measured true value. Only by setting the correct time and making a clock can the clock be correct. Time can have a resolution of one second (three hands, 60 borderlines), but 7 minutes is too slow, or 10 minutes is added every minute, so the precision is insufficient and the fine resolution is of no practical significance.

For digital pressure gauges, accuracy means the full scale of the gauge. So when calibrating 0.1% of full scale, the accuracy of our example 50.00psi pressure gauge is 0.05psi. So the resolution of the pressure gauge is 0.01psi, but the accuracy is 0.05psi. 60.00psi display has the same resolution, 0.01psi, but 0.1% of full scale equals 0.06psi.

Ask about the accuracy of the sensor, but ask about the resolution of the display.

So far, you may have found that sensors and displays play a role in determining accuracy and resolution. The accurate sensor does not match the display with poor resolution, the wrong sensor and the very detailed resolution display. In all cases, one person's weakness denies another person's strength. In order to have any value, the accuracy of the sensor should be properly matched with the resolution of the display.

It is very important to understand the difference between clarity and accuracy when comparing sensors and monitors. Understanding how to work together helps to choose a match that suits the measurement requirements.

What are the requirements for the accuracy of diaphragm pressure gauge?

Diaphragm pressure gauge is a testing tool, which requires very high accuracy. If the data measured by diaphragm pressure gauge in use is incorrect, there is a high possibility of finding a major accident, and it is too late to regret it. Therefore, the accuracy of diaphragm pressure gauge must meet these regulations.

Diaphragm pressure gauge is suitable for measuring the pressure of liquid, steam and gas without explosion danger, crystallization, solidification and corrosion of steel alloy. The accuracy of diaphragm pressure gauge selection shall meet the following requirements

The scale value of diaphragm pressure dial should be selected according to the actual working pressure of boiler. The selection range should refer to the regulations.

The operation effect of the barrier pressure gauge is very good, which has been liked by many users. If we are interested, we can feel it sometime. So what can't be ignored in the process of using the gap pressure gauge? Here are some basic knowledge that we need to pay attention to, and I hope we can all master it.

The first thing is to share some basic knowledge about diaphragm pressure gauge for us so as to deepen our image and understanding. Diaphragm pressure gauge mainly refers to the pressure gauge that separates the indicating part from the measured medium by means of the barrier equipment filled with working liquid. The barrier equipment mainly includes diaphragm type and bellows type.

Comparatively speaking, the former was widely used in the industrial field at that time, so let's first introduce the gap pressure gauge. In the process of installation, firstly, the inside of the tension spring tube is vacuumed by professional equipment, and then a certain amount of liquid is poured in, and it is sealed by diaphragm. Therefore, when measuring the pressure of medium, the measured working medium directly acts on the diaphragm, and the diaphragm deforms upward

Then through the transmission of working liquid, the pressure is transmitted to the tension spring tube to make it deform to a certain extent, and then the movement is driven by the connecting rod, so that the pointer indicates the measured pressure value on the dial of the diaphragm pressure gauge. In practice, according to different working environments and conditions, we need to choose the corresponding pressure gauge. For example, when measuring the pressure of general gas and water, ordinary pressure gauges can be used for measurement.

When measuring some corrosive media, such as nitric acid and other media pressures, stainless steel pressure gauges are needed. However, if the corrosion performance of the medium is stronger, or the pressure of the working medium is prone to crystallization or condensation, even if the stainless steel pressure gauge is selected at this time, the appearance may lose its function. The gap pressure gauge can solve these problems.

This is because the diaphragm pressure gauge has a special structure, so when measuring the pressure of these media, the diaphragm inside it can prevent the media with high viscosity, easy crystallization and easy condensation from flowing into the pressure guide hole, and then it can ensure the normal operation of the appearance. For this reason, diaphragm pressure gauges have long been widely used in measuring operations in petrochemical, metallurgical and electric power industries.

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