The Purchase Of Glass Rotor Flowmeter Must Not Be Blindly Followed
Dec 21, 2021
Are you still hesitating about testing machines with uneven prices on the market? Don't know how to choose a glass rotameter suitable for your industry and worry about it? Are you still worried about whether the glass rotameter you purchased has a reliable after-sales guarantee? After reading this article, you will have a deep understanding of the purchase of glass rotameter.
Generally speaking, in flow measuring instruments, except for positive displacement instruments, which do not have too many requirements for the fluid state, other instruments generally require the fluid to be as stable as possible (laminar flow state), so that the measurement results can be more accurate and stable. Therefore, try to keep a long enough straight pipe section on the upstream side of the flowmeter (straight pipe section refers to the pipe with the same diameter as the flowmeter, and cannot contain elbows, tees, valves, etc.) If there are valves, they are generally installed in The downstream of the flowmeter, so as not to have an impact on the measurement of the flowmeter (the most direct impact is the large fluctuation of the display value of the meter), if it must be installed upstream, the valve should be fully opened as far as possible to eliminate the influence on the flowmeter measurement to the greatest extent.
The selection of glass rotor flowmeter can be considered from the following aspects.
1. The performance of the flow meter itself. After the above conditions are determined, generally speaking, if there is no major change in the price, the needle valve placed on the upper part of the flowmeter is preferred; the one with a larger flow hole is a direct flow scale; the structure is simple; the outer size is smaller, etc. If it is a small flow range, you can choose the ball float type, because it is stable in measurement, not easy to accumulate dust, high accuracy, and good interchangeability.
2. The object of measurement. That is to measure the type of medium, pressure, and chemical properties. Such as liquid medium, gas medium, corrosion-resistant flowmeter should be selected for corrosive medium.
3. Choose according to price. Generally speaking, the price with high precision is high. The accuracy level of the instrument should be selected according to the measurement purpose. For example, if only the throughput of the measurement medium needs to be controlled, and the throughput must be stabilized after trial operation and adjustment, then the accuracy is secondary.
Do not blindly follow the purchase of glass rotor flowmeters, but be careful. Don't think it's good when others say it's good, you have to identify it yourself. Only what suits you is!
