OBLWGY SERIES TURBINE FLOWMETER-Wuxi OBAI Instrument Technology Co., Ltd.

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OBLWGY SERIES TURBINE FLOWMETER

The turbine flowmeter is a velocity-type instrument. It features high precision, good repeatability, simple structure, high pressure resistance, wide mea-surement range, small size

liucongli@wxobai.cn

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Product Related Description

The turbine flowmeter is a velocity-type instrument. It features high precision, good repeatability, simple structure, high pressure resistance, wide mea-surement range, small size, light weight, low pressure loss, long service life, simple operation and convenient maintenance. It is used to measure the volume flow and cumulative volume of low-viscosity, non-corrosive and clean liquids in closed pipelines. It can be widely applied in industries such as petroleum,chemical engineering, metallurgy, organic liquids, inorganic liquids, liquefied gas, urban gas pipeline networks, pharmaceuticals, food, and papermaking.

Main features

·High accuracy, generally up to ±1%R, ±0.5%R, high-precision type up to ±0.2%R; (R refers to reading error)
·Good repeatability, short-term repeatability can reach 0.05%~0.2%. It is precisely because of the good repeatability that extremely high accuracy can be obtained through frequent calibration or online calibration. It is the preferred flow meter in trade settlement;
·Output pulse frequency signal, suitable for total measurement and connection with computer, no zero drift, strong anti-interference ability;
·Original pulse frequency range (10Hz~1.5KHz), strong signal resolution;
·Wide range ratio, 10:1~20:1;
·Compact and lightweight structure, easy installation and maintenance, and large circulation capacity;
·Suitable for high-pressure measurement, no holes are required on the sensor body, and it is easy to make a high-pressure instrument;
·It can be made into an insertion type, suitable for large-diameter measurement, with small pressure loss and low price. It can be taken out without flowing out and is easy to install and maintain.

Working principle

When the measured liquid flows through the sensor, the impeller is forced to rotate under the action of the fluid, and its rotational speed is proportional to the average flow rate of the pipe. The rotation of the impeller periodically changes the reluctance value of the magnetic circuit, and the magnetic flux in the detection coil changes periodically, generating an induced electromotive force with the same frequency as the blade rotation frequency, which is amplified, converted and processed.

The practical flow equation of turbine flowmeter is: Qv f/K where:
Qv-is the volume flow rate (m3/s);
f-frequency of the flow meter output signal (Hz);
k-meter coefficient of flow meter (1/m3).
The relationship curve between the coefficient of the flow meter and the flow rate (or Reynolds number) is shown in Figure 1.1. As can be seen from the figure, the instrument coefficient is divided into two sections, namely the linear section and the nonlinear section. The linear segment is about two-thirds of its working segment, and its characteristics are related to the sensor structure size and fluid viscosity. The nonlinear segment characteristics are greatly affected by bearing friction and fluid viscosity resistance. When the flow rate is lower than the lower flow limit of the sensor, the instrument coefficient changes rapidly with the flow rate. When the flow rate exceeds the upper flow limit, attention should be paid to preventing cavitation.

Technical performance indicators

Connection method	Caliber range	Conventional pressure resistance grade	Special pressure resistance grade
Flange connection type	DN15-DN50	4.0MPa	≤10MPa
	DN65-DN100	1.6MPa	≤6.3MPa
	DN125-DN200		≤2.5MPa
Threaded connection type	DN4-DN40	6.3MPa

	DN50-DN80	1.6MPa
Clamping connection type	DN4-DN40		≤42MPa
	DN50-DN80		≤26MPa
	DN100-DN150		≤15MPa
	DN200		≤11MPa

Technical parameters

The medium under test	No impurities, low viscosity, and no strongly corrosive liquid
Enforce standards	Turbine flow sensor (JB/T9246-1999)
Verification Regulation	Turbine flowmeter (JG1037-2008)
Instrument diameter and Connection method	Flange connection type	DN25-DN200
	Threaded connection type	DN4-DN50
	Clamping connection type	DN4-DN200
Flange standard	Conventional standard	GB/T9113-2000
	Other standards	International pipe flange standard		DIN、ANSI、JIS
		Domestic pipe flange standards		Such as the standards of the Ministry of Chemical Industry and the standards of the Ministry of Machinery
Thread specification	Conventional standard	British standard pipe thread (External thread)
	Other specifications	Internal threads, spherical threads, NPT threads,etc
Accuracy grade and corresponding repeatability	Accuracy level	±1%R	±0.5%R			±2%R(Customized）
	Linearity	≤0.15%	≤0.1%			≤0.03%
Mileage ratio	10:1~20:1
Verification conditions	Verification device	Standard meter method liquid flow verification device, static mass method liquid flow verification device
	Environmental conditions	Ambient temperature			20℃
		Relative temperature			65%
Conditions of use	Medium temperature	T1 General type,standard			-20℃~+80℃
		T2 High-temperature type, customized			-20℃~+120℃
		T3 High-temperature type, customized			-20℃~+150℃
	Ambient temperature	-20℃~+60℃			Relative temperature		5%~90%
	Atmospheric pressure	86KPa~160KPa