On the selection of pressure-air metering devices

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Regarding the choice of a measurement scheme for compressed air flow rate, it is necessary to analyze each case on a case-by-case basis: many field process requirements involve measuring the air flow rate at the compressor’s outlet, and then using this value to calculate the inlet flow rate, thereby determining the actual work efficiency of the compressor. To be honest, there aren’t really any particularly good methods for measuring traffic in this area. Because the compressed air coming out of the compressor, without any treatment of the gas, exists in a two-phase fluid state; this is even more true in southern regions where humidity is high, as the moisture in the compressed air exists in both liquid and gaseous forms. Moreover, the process pipelines on site do not have an ideally optimized installation distance for flow meters. We have developed many plans, but none of them were able to solve the problem satisfactorily. In the section where the compressed air, after treatment, reaches the condensation tank, since it is treated gas, its state is relatively ideal; of course, this also depends greatly on the technical capabilities of the treatment process. For the measurement equipment in this area, it is recommended to use thermal mass flow meters. The reason for this is that thermal mass flow meters are types of mass flow meters that do not require temperature and pressure compensation devices, making them easy to install. Additionally, they have a wide measurement range, so there is no issue of inability to measure certain values. Another reason is the poor noise conditions in the compressor room, along with high levels of vibration on site, which make it unsuitable to use flow meters such as vortex flow meters; therefore, a thermal mass flow meter is the best choice. At the rear end of the air storage tank, it has a pressure-regulating function that helps to stabilize the airflow rate. Therefore, for this type of flow meter, thermal mass flow meters and vortex flow meters can be chosen. The overall preference remains for thermal types, after all, vortex flowmeters are complicated to configure, require a lot of installation work, have numerous leakage points, and thus also have a relatively high failure rate. Relatively speaking, thermal types do not have these problems, and they are stable for long-term use. Based on the dozen or so cases we have handled, thermal flowmeters can be considered maintenance-free; of course, the choice of brand is crucial.

For measurement purposes, are you sure that thermal accuracy is sufficient?

Sure, we have numerous cases to prove this. It’s quite important to know whether it works well: choose a reliable brand. Just like when you sell cars, some cost tens of thousands while others cost hundreds of thousands; there is a big difference in that. So it is also very important to make one's own choice.

I’d like to ask gently: what is the precision of the thermal type you are using? The accuracy of E+H’s thermal gas measurement method is 1.5%, while that of the mass flow meter is 0.35%. When used for measurement purposes, this difference accumulates over time and can be significant. Although it’s not practical to pursue excessive precision, accuracy still serves as a basic reference point