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Which is a good thermal gas mass flowmeter?
2. How much does a home oxygen pack cost?
The price of a home oxygen pack varies depending on the type, capacity, brand, and purchasing channel, ranging from tens to hundreds of yuan, depending on actual needs.
1. Price situation by type: 1) Disposable oxygen packs have a capacity of about 10L and are made of aluminum foil material, which cannot be reused. The price is usually between 30-80 yuan per pack, suitable for short-term emergencies.
. 2) Reusable oxygen reed packs are mostly made of PVC or rubber materials, with a capacity of 10-40L. They need to be inflated with an oxygen generator or oxygen cylinder, and the price varies depending on the capacity. The small capacity (10L) is about 50-150 yuan, and the large capacity (40L) can reach 200-500 yuan.2. Factors affecting price: 1) In terms of brand and quality, well-known brands such as Yuyue and Yingweikang have better craftsmanship and sealing, and their prices are 20% -50% higher than ordinary brands.
. 2) On the purchasing channel, online e-commerce platforms such as JD.com and Taobao have more transparent prices, which are 10% -30% lower than offline pharmacies or medical equipment stores. Some pharmacies offer discounts during promotions. 3) In terms of additional features, the intelligent oxygen pack with flow meter and pressure gauge is 50-100 yuan more expensive than the regular model, making it suitable for people who need precise control of oxygen flow.III. Precautions for Selection: 1) Prioritize selecting products that meet medical device standards such as CFDA certification to prevent air leakage or material defects. 2) For short-term use, choose disposable opt
3. Calculation formula for oxygen flow rate
The calculation formula for oxygen concentration is: oxygen concentration=21+4 x oxygen flow rate, which can be measured by an oxygen flow meter.
. Vortex flowmeter is a device for measuring gas flow rate. According to the Karman principle, the flow rate will alternately generate vortices through a blunt body. The blunt body has a wide flat leading edge, and the vortex generator in the vortex flowmeter extends vertically to the fluid in the outlet pipe. The vortex frequency is directly proportional to the flow velocity, and the flow rate can be calculated by multiplying the area by the fluid flow velocity of the tube. In some cases, in order to eliminate distorted flow patterns and swirl blades, or upstream pipelines with straight chains, the vortex body needs to be straightened. However, under low flow conditions, this vortex body tends to irregularly generate vortices, which can affect the accuracy of measurements. The accuracy of oxygen flow meters can range from intermediate to advanced, depending on the model and manufacturer. Under low flow conditions, the accuracy of the flowmeter may be affected, so when selecting a flowmeter, it is necessary to consider the actual usage environment and flow range to ensure measurement accuracy. To improve measurement accuracy at low flow rates, special flow correction methods or equipment such as flow correctors or flow compensators can be considered. In addition, proper installation and maintenance of oxygen flow meters are also very important, including regular calibrat
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