The difference between a miniature vacuum pump and a gas sampling pump

In environmental protection (such as automobile exhaust gas detection, laboratory gas composition analysis, etc.), gas sampling analysis is often used. How to distinguish the type selection in miniature vacuum pumps, micro gas pumps, miniature gas pump, micro gas sampling pump, and micro gas circulation pump? ?

Institutions or industries such as scientific research, medical treatment, and environmental protection often use miniature vacuum pumps, micro-pumps, micro-pumps, micro-gas sampling pumps, and micro-gas circulation pumps. According to different uses, miniature vacuum pumps can be divided into: miniature vacuum pumps, gas sampling pumps, gas circulation pumps, suction pumps, pumping pump and other types.

Usually we call a small-volume pump that can generate a negative pressure as a miniature vacuum pump, but we must strictly distinguish between product selection.

In the true sense of a miniature vacuum pump, if there is a miniature vacuum pump VAA series: it is a pump that can evacuate a closed container for a long time, and it can drive a larger load. Widely used: the pumping end may have a valve, the need for long-term continuous operation with a large load, or the vacuum object adsorption and other occasions, such as system pressure, continuous 24-hour operation, acceleration of liquid filtration and so on.

The gas sampling pump, if there is a micro-pump PM series, the pressure difference between the inside and outside of the pump chamber during operation is small, so its load is very small, but it is because of the weak load capacity, it is suitable for: Gas sampling, intermittent use, or where pump noise, volume requirements are more stringent. Such as automotive exhaust testing, gas composition analysis, microbial sampling, and so on.

It is because of the different requirements on the carrying capacity, resulting in a very large difference between the parts used in the miniature vacuum pump and the gas sampling pump. Miniature vacuum pumps have very high requirements for diaphragms and motors. For these two major parts, technical indicators such as fatigue strength, reliability, and life expectancy are required to meet the standards under the condition of the load, and unlike the gas sampling pump, the requirements are met only under very light loads (tests prove that the load is slightly Large gas sampling pumps are easily damaged). Therefore, the cost of the two miniature pumps varies greatly.

In summary, if a miniature vacuum pump is used for gas sampling, high reliability and long life are bound to be obtained, but the cost is high; if the gas sampling pump is used in a slightly larger load, reliability and lifespan It is not even able to work properly, although it has a great advantage in terms of cost. When selecting a model, it is advisable to consult with the actual situation or consult a professional to take into account both cost and performance.

Some gas sampling pumps can also achieve better vacuum and flow indicators. However, achieving this technical indicator and being able to work reliably for a long time under this indicator are two different things. For example, if a micropump can achieve a vacuum of 30KPa, can the pump work reliably when the suction of the pump is always at this vacuum? Therefore, the index that the pump can reach is not the same as the index that it can work reliably. Please consult with the professional when purchasing.