What are the common shortcomings of pressure gauges in use?

When measuring stable pressure, the measuring range should be 1.5 times of the measured value; When measuring fluctuating pressure, the maximum range should be 2 times of the measured value. The measuring range of pressure gauge should be properly selected to prolong the service life of the instrument.

Selection of pressure gauge range:

1. When measuring the stable pressure, the working pressure should not exceed 2/3 of the range.

2. When measuring the pulsating pressure, the working pressure should not exceed 1/2 of the range.

3. When measuring high pressure, the working pressure should not exceed 3/5 of the range.

Although we often praise the advantages of the pressure gauge when using it, some shortcomings in its operation cannot be ignored. If you don't encounter the shortcomings mentioned in Xiaobian when using the pressure gauge, you can look at these phenomena mentioned in Xiaobian first. The main reasons for these shortcomings are as follows:

It is precisely for these reasons that pressure gauges have attracted more and more attention in recent years. Domestic and foreign manufacturers regard the production of pressure gauges as the top priority of research and development, making the combination of transmission mechanism, adjusting mechanism and piston of pressure gauges more simple, flexible, economical and reliable

In order to meet the requirements of stepless flow regulation, the flow regulation part is developed as an independent module.

Various control modes, such as manual control, electric servo control, pneumatic servo control and frequency conversion control, are developed, which can be adjusted by changing the stroke, and the electric automatic adjustment of metering pump flow can be realized by controlling the electric servo mechanism or pneumatic servo mechanism connected with the stroke mechanism of metering pump.

Three standard characteristics of shock-resistant pressure gauge

Anyone who comes into contact with the pressure gauge industry knows the shock-resistant diaphragm pressure gauge. Shock-resistant diaphragm pressure gauge is a new type of pressure gauge which combines the advantages of these two instruments. It has many advantages and its own characteristics. Wuxi Kejia Special Pressure Gauge Co., Ltd. will introduce three standard characteristics of shock-resistant pressure gauges.

1. Material characteristics of shock-resistant pressure gauge

The shock-resistant pressure gauge is made of stainless steel, which can make its exterior have better corrosion resistance and can be used in very harsh external environment, making its application range wider;

2. Corrosion resistance

Diaphragm isolator of shock-resistant pressure gauge can measure some corrosive media without damaging internal devices. Diaphragm isolator can block the measured medium from the outside of the table and measure it, which perfectly inherits the advantages of diaphragm pressure gauge;

3. Temperature characteristics

Because the system of shock-resistant pressure gauge takes sealing liquid as pressure transmission medium, the temperature influence of diaphragm flowmeter is related to the expansion coefficient of sealing liquid, the stiffness of diaphragm and the temperature of pressure parts. Especially suitable for low-range pressure instruments. Generally, the temperature error of the pressure part is not more than 0.1% /℃, so the temperature influence of the diaphragm gauge is generally the sum of the temperature influence of the general pressure instrument and the pressure part of the diaphragm isolator.

When the diaphragm of stainless steel diaphragm pressure gauge works under negative pressure (that is, the pressure of the measured medium contacted by the diaphragm is lower than atmospheric pressure). On the contrary, after a period of use, the transmitter is prone to failure. When checking the faulty transmitter, it is often found that there is gas under the diaphragm, and the diaphragm expands to the limit, so the medium pressure can no longer be carried out. This kind of problem exists in distillation, refining and regeneration of gas desulfurization liquid in coal chemical plant. In contrast, similar stainless steel diaphragm pressure gauges have not found such faults under positive pressure.

Error analysis of stainless steel diaphragm pressure gauge

A closed space is composed of diaphragm, diaphragm chamber, capillary tube and part of transmitter body (referred to as pressure guiding chamber). The pressure guiding chamber is filled with pressure guiding fluid (usually silicone oil). The pressure of the measured process medium is transmitted to the transmission body through the diaphragm and the pressure conducting fluid. On the diaphragm, the pressure of the pressure conducting fluid on both sides of the diaphragm, the pressure conducting fluid on both sides of the diaphragm, and the pressure of the process medium form a balanced relationship with the stress when the diaphragm is elastically deformed.

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