Who has used a laminar flow mass flow meter?
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Its measurement principle is different from the Coriolis method; it is said to be very effective for measuring small flow rates and has a fast response time. There is a company in China named Yidu that produces this device – has anyone used it?
I’ve never used it; I’ve even never heard of it. . . . . .
American ALICAT? Laminar differential pressure? I’ve only heard of it; I haven’t used it. The gas can be switched, but the downside is that it can’t handle high pressures
It’s the same approach as Alicat, low pressure
Check it out – Alicat is claimed to be the fastest mass flow meter in the world, with lifetime maintenance-free operation
This post was last edited by 1111111 on 2018-4-27 at 16:47. I went and looked it up. . . This kind of product has existed for a long time – at least 15 years ago, I think. I vaguely remember a company named something like that, based either in Beijing or Tianjin; it existed back in those early days. It claimed to be the fastest in the world, stating a response time of 10 milliseconds, but that’s complete nonsense. Given the technical capabilities of its products, whether in terms of display, communication, or current/voltage output, it simply does not have the ability to update measurement data every 10 milliseconds. As for measuring flow rate, it involves discrete integration and cumulative calculation. Flow rate isn’t some bomb that can experience sudden explosions; so what’s the use of claiming it to be the \"fastest\"? It has no real value at all. ““Laminar flow” – is that probably just another fancy gimmick, too? I guess that inside the product, there is a flow channel designed based on the Venturi principle; the measurement mechanism relies on the differential pressure principle. The software associated with this product contains a large table with temperature and pressure compensation data for 130 different gases. It is through this temperature and pressure compensation that the mass flow rate is determined. But if the gas being measured isn’t one of those 130 gases, how can it then calculate the mass flow rate? So this type of product, which is called a “mass flow meter,” seems a bit strange and odd to me. ““Lifetime maintenance-free” – that’s a bit absurd. For measuring instruments, it is necessary to calibrate the sensors at regular intervals in order to ensure the accuracy of measurements by the entire device. This product has three sensors: one for differential pressure, one for absolute pressure, and one for temperature. For sensors with a small pressure difference and a limited measurement range, zero drift is the main source of error; without regular calibration, such sensors lose their accuracy. As for temperature sensors, large time drift is also a characteristic of them. What I’m saying is that when it comes to electronic measuring instruments, one shouldn’t blindly believe in claims like “lifetime maintenance-free.” If you don’t demand high accuracy, then any instrument can be made to appear “maintenance-free” forever. /// Friendly reminder: What I oppose is the exaggeration in technical claims. . . Bro, I’m not saying this product is bad; I think it’s a good product /
Just spreading some knowledge – this is purely a gimmick. Mass flow meters measure flow rates independently of the flow regime; they can measure flow rates in both laminar and turbulent conditions