Beijing liquid turbine flowmeter | Liquid turbine flowmeter? | Industrial wastewater flowmeter manufacturer

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1. Installation and use of turbine flowmeter

The installation and use of turbine flowmeter require strict control from four aspects: selection of measured medium, installation of piping, configuration of signal transmission line, and operation and maintenance, to ensure measurement accuracy and equipment reliability. Selection of applicable medium for the tested medium: Turbine flowmeters are suitable for low viscosity (generally less than 15 × 10 ⁻⁶ m ²/s) and low corrosive liquids. For high temperature, high viscosity or highly corrosive media, special measures (such as heating, anti-corrosion treatment) or specialized models should be taken. Viscosity limit: When the viscosity of the medium exceeds 15 × 10 ⁻⁶ m ²/s, real liquid calibration must be performed, otherwise the instrument coefficient error will be significant. Prohibited measurement types: vapor-liquid, gas-solid, and dense solid two-phase flows cannot be measured using a turbine flowmeter, as multiphase flow can damage the stability of turbine rotation. Installation piping requires a straight pipe section: a 20D straight pipe section is required upstream, and a 5D straight pipe section (D is the pipe diameter) is required downstream to eliminate uneven flow velocity distribution and secondary flow effects. Installing rectifiers upstream can further improve accuracy and achieve calibration level measurement accuracy. Filter installation: A silver funnel filter with a stool must be installed before the flowmeter to prevent impurities from damaging the turbine. By monitoring the differential pressure changes at both ends of the filter, determine its cleanliness and clean it in a timely manner. Degassing device and back pressure control: Degassing d

evices should be installed upstream of the flow meter for easily vaporized liquids to prevent gas from entering. Downstream pressure needs to be maintained, and the calculation formula is: back pressure=2 × (sensor pressure drop at maximum flow)+1.2 × (liquid vapor pressure at maximum temperature). Length limit for signal transmission line configuration: The maximum length of the signal line is L=dV, where V is the effective value of the output voltage of the sensing coil at the minimum flow rate (measured in mV), and d is the coefficient (d=1.0 when V<1000mV); When 1000mV ＜ V ＜ 5000mV, d=1.5; D=2.0 when V>5000mV). Shielding and grounding: Use shielded cables and shield grounding at the display instrument end to prevent electromagnetic induction noise. Transmission lines should be kept away from strong electromagnetic equipment and should not be arranged parallel to power lines to avoid capacitive coupling interference. Key points for operation and maintenance: Pipeline cleaning: When cleaning the pipeline, the bypass must be opened to prevent the cleaning solution from passing through the flow meter and to prevent the turbine from getting stuck or corroded. System startup: When starting, first open the bypass and wait for the fluid to stabilize before switching to the flow meter to prevent turbine overspeed damage caused by sudden changes in flow rate. Bearing replacement: Regularly check for changes in small flow characteristics. If there are measurement deviations or abnormal noises, the bearings should be replaced in a timely manner. It is usually recommended to replace them every 1-2 years (the specific cycle should be adjusted according to the working conditions). Summary: The installation and use of turbine flow m

Beijing liquid turbine flowmeter | Liquid turbine flowmeter?

1. Installation and use of turbine flowmeter

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