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How to choose the air compressor sensor？

Air compressor will basically use the sensor, its role isIn the operation process, it is necessary to record and display the speed, temperature, air output, pressure and other parameters in real time. Nowadays, there are many kinds of sensors, and we need to choose sensors according to the type when choosing to measure different parameters。If the unreasonable selection of sensors will bring certain troubles in the actual measurement and service life of the data, then how should we choose different sensors？

1, according to the measurement object and measurement environment to determine the type of sensor
To carry out a specific measurement work, we must first consider what principle of the sensor is used, which needs to be determined after analyzing various factors。因为，Even when measuring the same physical quantity，A variety of sensors are also available，Which principle sensor is more suitable，The following specific issues need to be considered according to the characteristics to be measured and the conditions of use of the sensor: the size of the range;The sensor volume requirements of the measured position;Whether the measurement mode is contact or non-contact;Signal extraction method，Wired or non-contact measurement;Source of sensor，Domestic or imported，Whether the price is affordable，Or homemade。
After considering the above issues, it is possible to determine what type of sensor to choose, and then consider the specific performance pointer of the sensor。
2, the choice of sensitivity
Generally, in the linear range of the sensor, the sensitivity of the sensor is expected to be as high as possible。Because only when the sensitivity is high, the value of the output signal corresponding to the measured change is relatively large, which is conducive to signal processing。However, it should be noted that the sensitivity of the sensor is high, and external noise unrelated to the measurement is easy to mix, and will also be amplified by the amplification system, affecting the measurement accuracy。Therefore, it is required that the sensor itself should have a high signal-to-noise ratio to reduce the factory interference signal introduced from the outside world。
The sensitivity of the sensor is directional。When the measurement is a single vector, and the requirement for its directionality is high, other sensors with small directional sensitivity should be selected;If the measured vector is multidimensional, the cross sensitivity of the sensor is required to be as small as possible。
3. Frequency response characteristics
The frequency response characteristic of the sensor determines the frequency range to be measured, and the measurement conditions must be maintained within the allowed frequency range. In fact, the response of the sensor always has a fixed delay, and it is hoped that the delay time is as short as possible。The frequency response of the sensor is high, and the frequency range of the measurable signal is wide, while the inertia of the mechanical system is large due to the influence of the structural characteristics, and the frequency of the measurable signal is low because of the sensor with low frequency。In dynamic measurement, the response characteristics should be based on the characteristics of the signal (steady state, transient, random, etc.) to avoid excessive error。
4. Linear range
The linear range of the sensor refers to the range where the output is proportional to the input。In theory, within this range, the sensitivity remains constant。The wider the linear range of the sensor, the larger its range, and can ensure a certain measurement accuracy。When selecting a sensor, when the type of sensor is determined, it is first necessary to see whether its range meets the requirements。
But in fact, no sensor can guarantee absolute linearity, and its linearity is also relative。When the required measurement accuracy is relatively low, in a certain range, the sensor with small nonlinear error can be approximated as linear, which will bring great convenience to the measurement。
5. Stability
The ability of a sensor to remain unchanged in performance over a period of time is called stability。In addition to the structure of the sensor itself, the main factor affecting the long-term stability of the sensor is the use environment of the sensor。Therefore, in order to make the sensor have good stability, the sensor must have strong environmental adaptability。
Before selecting a sensor, the environment for its use should be investigated, and the appropriate sensor should be selected according to the specific use environment, or appropriate measures should be taken to reduce the environmental impact。
The stability of the sensor has quantitative indicators, and after exceeding the use period, it should be re-calibrated before use to determine whether the performance of the sensor has changed。
In some cases where the sensor is required to be used for a long time and cannot be easily replaced or calibrated, the stability of the selected sensor is more stringent and should be able to withstand the test of a long time。
6、精度
Accuracy is an important performance pointer of sensor, and it is an important link related to the measurement accuracy of the whole measurement system。The higher the accuracy of the sensor, the more expensive its price, therefore, the sensor
Accuracy As long as it meets the accuracy requirements of the entire measurement system, it is not necessary to choose too high。In this way, a cheaper and simpler sensor can be selected from many sensors that meet the same measurement purpose。
If the purpose of measurement is qualitative analysis, the sensor with high repetition accuracy can be selected, and the sensor with high absolute value accuracy should not be selected.If it is for quantitative analysis, it is necessary to obtain accurate measurement values, and it is necessary to choose a sensor with an accuracy level that can meet the requirements。 For some special use cases, it is not possible to select a suitable sensor, so it is necessary to design and manufacture the sensor by itself。The performance of the self-made sensor should meet the requirements of use。

2023.02.07

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How much does the annual inspection of air storage tank cost

The use of air compressor needs annual inspection, and the air storage tank also needs annual inspection, so how much is the annual inspection cost of the air storage tank？Let's take a look:

Since the gas storage tank is special equipment, it must generally be tested by the State Bureau of Quality Supervision before it can be used。According to its volume and pressure, the gas storage tank can be divided into simple pressure vessels and fixed pressure vessels。Among them, simple pressure vessels can be exempted from inspection within seven years, but more than seven years must be inspected, which is also for safety considerations。Fixed pressure vessels must be inspected once a year, and the cost and process of annual inspection must be asked of the user's local quality supervision bureau。

The annual inspection cost of gas storage tank is different in different places, and the requirements are not the same。Annual inspection must bring the product quality certificate, without this certificate can not be annual inspection。Customers who have lost data can find the original factory that purchased the gas storage tank for replacement, which can be replaced once within 7 years, and can not be replaced if the purchase time exceeds 7 years。In addition, the pressure gauge and safety valve above the gas storage tank should also be inspected annually, and the quality Supervision Bureau will verify it for correct use。
Generally, the pressure vessel factory will pass the inspection of the quality supervision bureau when it is produced well, but the customer will also have to inspect the local quality supervision bureau when purchasing and using it. For the specific price and inspection process, please consult the local quality Supervision Bureau。

2023.02.03

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What are the energy-saving benefits of air compressors？

How to write the energy-saving efficiency of air compressor？Many people say that air compressors save energy, but they do not know what the energy saving benefits are？Xiaobian has made a simple summary based on these:

1. Energy conservation

Compared with the traditional control compressor, energy saving is the most practical significance。According to the requirements of the air volume, the compressor state supplied by the air volume is an economic operation state。As far as the current equipment operation is concerned, the power saving rate can reach more than 20%。
2, reduce maintenance costs
The air compressor economizer has a soft start function, which reduces the impact of starting on the equipment, reduces the amount of maintenance, and greatly reduces the maintenance cost。
3, improve the pressure control accuracy
The energy-saving control system of air compressor has the ability of precise pressure control。The air pressure output of the compressor matches the air volume required by the user's air system, and the output volume of the control compressor changes with the speed of the motor。Due to the improvement of motor speed regulation accuracy, the pressure change of pipe network is basically unchanged。
4, extend the service life of the compressor
By adjusting the starting acceleration time of the compressor, the impact on the electromechanical components of the compressor is reduced, the reliability of the system is improved, and the service life of the compressor is extended。In addition, the control can also reduce the current fluctuations during the unit start-up process, thus affecting the power consumption of equipment such as the power grid, and the economizer can effectively minimize the peak value of the starting current。
5, reduce the noise of air compressor
According to the working conditions of the compressor, the running speed of the motor is significantly slowed down after the energy-saving transformation, which effectively reduces the noise in the operation of the air compressor。

2023.02.01

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There are many types of air compressors, and different types of air compressors have different uses。Many small partners are curious about high pressure air compressor and low pressure air compressor which is better？What's the difference between the two?Xiaobian has compiled the following content:

First, the same place of high pressure air compressor and low pressure air compressor

High-pressure air compressor and low-pressure air compressor two models of the principle is the same, the low pressure is a compression process, the high pressure is two compression process, that is, the gas after the compression of the low-pressure cylinder into the high-pressure cylinder again compression, and then into the air compressor storage tank, generally 8KG above the standard pressure needs two compressions。
Two, the difference between high pressure air compressor and low pressure air compressor
1, some refers to the level of the power supply voltage, such as the input voltage is generally: single-phase 380V, three-phase 380V, 660V, 6000V, 10000V and so on。
2, some refers to the level of work pressure, from high to low can be divided into:
(1)、高压压缩机10MPa<排气管工作压力≤100MPa。
(2), low pressure compressor exhaust pipe working pressure ≤1.0MPa。
3, some refers to the displacement size, from large to small can be divided into:
(1)中小型压缩机1m³/min<排气量≤10m³/min。
(2)大型压缩机排气量>100m³/min。
In summary, the high-pressure air compressor and the low-pressure air compressor are essentially not much different, and the specific use depends on the use of the air compressor displacement and so on。

2023.01.28

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