Seeking advice on selecting a gas flow meter
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DN700, hot air, with a flow rate of around 19,000 Nm3/h. Due to cost control, even orifice plates with such large diameters are considered too expensive. I need a functional plug-in flow meter with high accuracy, ideally at ±0.5%
The precision definitely won’t be sufficient: lol Use a barometric or thermal type instead
Well, I see. After considering it, Delta Ba A Niu Ba Alibaba, the accuracy of this is only around 1%. If the other sea friends have no good options, I’ll go with this thing
If multiple inputs are used, the accuracy cannot be achieved
According to the manufacturer, it’s possible to achieve thermal mass
My temperature is already at 350; even the thermal type isn’t working anymore
Hello, OP. Regarding the effects of long-term use for the question you raised, it is recommended to use a thermal gas mass flow meter. Whether measured in terms of installation, stability, performance at low flow rates, or failure rate, thermal types have significant advantages. As for the 0.5% accuracy you mentioned, strictly speaking, no product on the market can achieve that; a comprehensive error rate of 1–2% is already quite good. If you choose a thermal product, it is recommended to opt for an imported one; the quality of thermal products varies greatly among different manufacturers, with significant differences in their technical performance. From my personal advice, it’s better to choose a reliable option; don’t let the price fool you. That’s my advice. As for the 350 degrees you mentioned, that’s not a problem.
This post was last edited by waneng on 2017-6-30 08:56. It is recommended to choose a orifice flow meter; if low pressure loss is required, a nozzle flow meter can also be used. Even with such a large orifice size, these plates are still cheaper than thermal mass flowmeters of the Ba type, while the relative cost of nozzles is higher. For Ba-type instruments, Anubaa is the preferred choice, followed by Delta Ba and Weiba. Aniuba has a high cost, but it offers a large pressure difference and high measurement accuracy. For thermal mass flow meters, such high operating temperatures can only be achieved by American companies like Wyott and FCI; ABB and E+H can only handle temperatures of 150–170°C. The accuracy of the above instruments may not meet the level of accuracy you require; further design consideration is needed. Given the options of orifice and thermal mass flow meters, I was wondering if it would be possible to set the price at its highest level; therefore, an orifice plate is a more suitable choice – it is easy to maintain and durable.
Hello, friend. Some of your views are debatable: as we all know, due to principle and structural issues, differential pressure meters require the most maintenance, and they are the most difficult to maintain among all types of flow meters – after all, there are many sealing points, and it takes effort to determine what’s wrong. If there is a problem with the orifice plate, then the amount of work involved is considerable. Those who have used the overheating type know that its installation and maintenance are very convenient. Moreover, once the initial debugging is completed, the long-term stability of use is very high. As for a temperature of 350 degrees, I’ve said that this isn’t any difficult problem. And it’s not just a few companies as you said that can do it; those that do it well include SIERRA, Kuz, Bingde, FCI, and others.
We have handled a similar project before as well – large diameter pipes, high-temperature gases, and ultrasonic technology was used; the cost was lower than that of orifice plates. If you want to know more, you can contact me at Q:9464468
We also recently discussed thermal mass flow meters; the temperature tolerance of ABB and E+H is only 150°C. As for brand assets, I’ve never heard of brands like Bingde. There are many ads in it; it can be listened to but not trusted. Use it with caution.