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1. Classification of Float Flow Meter
Usually, standardized products and special instruments can be classified differently from different perspectives, such as transparent conical tubes and metal conical tubes according to the material of the conical tube. According to whether there is remote signal output, it is divided into local indication type and remote signal output type, the latter of which is further divided into two types: electric shock signal and electrical signal. According to the measured fluid, it is divided into liquid, gas, and steam. According to the amount of fluid passing through the float flowmeter, it is divided into full flow and split flow types. Classification of Cone Tube Materials
(1) Transparent Cone Tube Float Flow Meter The most commonly used material for transparent cone tubes is glass. Improper operation of unguided structure instruments when measuring gases can easily shatter glass tubes; It is also made of transparent engineering plastics such as polystyrene, polycarbonate, organic glass, etc., which have the advantage of not being easily broken.
(2) Compared with transparent cone tube float flow meters, metal tube cone tube float flow meters can be used for higher medium temperatures and pressures, and there is no potential danger of glass tube float flow meter cone tubes being crushed.
. The typical structure shown in Figure 3 is an integrated structure of a conical tube and a shell, or a separate structure where the conical tube is inserted into the shell. Changing the flow specification only requires replacing the conical tube with a different cone angle, which is more convenient to use. Classification type based on whether there is remote signal output<
(2) Remote signal output type float flowmeter The conversion part of the remote signal output type instrument converts the displacement of the float into an analog signal output of current or air pressure, which becomes an electric remote float flowmeter and an air remote float flowmeter, respectively. According to the type of fluid being tested, it can be classified into three types: liquid, gas, and steam. In fact, most float flowmeters can be used for both liquids and gases, and their structures are universal. However, the industry standards for float flowmeters in China, such as JB/T 6844-93, stipulate that the upper limit Qmax of the flow rate must meet the requirements of (1, 1.6, 2.5, 4 or 6) × 10nL/h (n is a positive or negative integer or zero). Instruments designed for liquids (represented by water) and used for gases (represented by air) do not meet the above requirements, and can only be separately designed with floats and cone tubes for gases, which are divided into two series: liquid and gas. Some foreign manufacturing plants use the same instrument to measure the flow range of both liquid and gas fluids, but of course, the flow values cannot all be rounded; Some models of instruments in China also adopt this meth
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