Seven key points in the use of metal tube float flowmeter
Time: 2024-07-17
Metal tube float flowmeter is more widely used, generally used to measure the medium, small flow and micro-flow, the measurement medium is generally clean, not easy to crystallise and solidify, viscosity of the liquid and gas, steam, the requirements of the medium flow rate changes slowly.
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Project Overview
For a variety of factors that will be encountered in the installation of the impact of the metal tube float flowmeter manufacturers needle in the installation of the following aspects of the factors to friends to make an introduction.

- 1、Instrument installation direction of the vast majority of float flowmeter must be installed vertically in the pipeline without vibration, there should be no obvious tilt, the fluid flows through the instrument from bottom to top. Float flowmeter centre line and the plumb line between the angle is generally not more than 5 degrees, high precision (1.5 or more) instrument θ ≤ 20 °. If θ = 12 ° will produce 1% additional error. Instrument without strict upstream straight pipe section length requirements, but there are manufacturers require (2-5) D length, in fact, the need is not great.
- 2、Installations for dirty fluids should be fitted with a filter upstream of the meter. With magnetic coupling metal tube float flowmeter for may contain ferromagnetic impurities in the fluid, should be installed in front of the instrument magnetic filter. To keep the float and cone tube clean, especially small diameter instruments, float cleanliness significantly affect the measured value. For example, 6mm calibre glass float flowmeter, in the laboratory to measure the seemingly clean water, the flow rate of 2.5L / h, running 24h, the flow rate increased by a few percent, the float surface stained with the naked eye to observe the foreign matter, remove the float with gauze, that is, to restore the original flow rate value.
- 3、Pulsating flow of the installation of pulsation of the flow itself, such as to install the instrument position of the upstream of the reciprocating pump or regulating valve, or downstream of the large load changes, etc., should be changed to the measurement position or in the piping system to be remedied to improve, such as the addition of buffer tanks; if the instrument's own vibration, such as measurement of the gas pressure is too low, instrumentation upstream of the valve is not fully open, the regulating valve is not installed downstream of the instrument and so on, the target should be to improve to overcome or change to the use of a damping device. Damping device of the instrument.
- 4、Expand the range of installation if the measurement requirements of the flow range of degrees wide, range of degrees more than 10, often using more than 2 sets of different flow range of glass tube float flowmeter in parallel, according to the measurement of the choice of one or more of its instrumentation in series, small flow rate read under the flow rate range of the instrument value, large flow rate read large flow rate instrumentation value, the series method than the parallel method of operation is simple, no need to open and close the valves frequently, but the pressure loss of a large. The series connection method is easier to operate than the parallel connection method.
- 5、To exhaust the liquid with the instrument gas import and export is not in a straight line Angle Metal Float Flowmeter, for the liquid, pay attention to the outward displacement of the float casing whether the residual air must be exhausted; if the liquid contains small bubbles flow is very easy to accumulate in the casing, it should be timed to exhaust. This is more important for small-diameter instruments, otherwise the impact of the flow rate value is obvious.
- 6、Flow value for the necessary conversion if not according to the use of density, viscosity and other media parameters to the manufacturer of specially customised instrumentation, liquid instrumentation is usually water calibration flow, gas instrumentation with air calibration, fixed value in the state of engineering standards. The use of conditions of fluid density, gas pressure and temperature and calibration is not consistent, to do the necessary conversion.

Supmea has been producing metal tube float flowmeter for many years, if you encounter any problems in the process of metal tube float flowmeter selection, installation, use and maintenance, you can contact Supmea at any time, we help you to answer.