LUGB Insertion Vortex Flowmeter from China Manufacturer - Aister Instrument (Shanghai) Co., Ltd

Introduction

The Insertion vortex steam flowmeter is mainly used for the flow measurement of large-diameter gas, liquid and steam medium fluids in industrial pipelines in various industries. It is characterized by small pressure loss, large range and high accuracy. It is almost unaffected by fluid density, pressure, temperature, viscosity and other parameters when measuring volume flow under working conditions. There are no moving mechanical parts, so the reliability is high and the maintenance is small. The instrument parameters can be stable for a long time. The Insertion vortex flowmeter adopts piezoelectric stress sensor, which has high reliability and can work in the operating temperature range of -20℃ ~ +250℃. With analog standard signal and digital pulse signal output, it is easy to use with digital systems such as computers, and is an ideal flow meter.

The Insertion vortex flowmeter is mainly composed of pressure sensor, measuring circuit and process connector. It can convert the physical pressure parameters such as gas and liquid felt by the pressure sensor into standard electrical signals to supply the secondary instruments such as alarm, recorder and regulator for measurement, indication and process adjustment. In China, the Insertion vortex flowmeter currently used in small automatic control is generally based on the piezoresistive principle, that is, the resistance changes after the pressure of the varistor, and the pressure detection can be carried out by amplifying it and using standard pressure calibration.

Features

01

The versatility of the sensor of the intelligent vortex flowmeter is very strong, so that the sensor has good interchangeability. The surface body and vortex generator of the sensor are processed by CNC equipment to ensure the processing accuracy, so that the universality of the parts (especially the vortex generator) is strong, so that the repeatability and accuracy of the sensor will not be affected by the replacement of the parts. It can produce a strong and stable vortex signal.

02

Simple and firm structure, no moving parts, high reliability, easy to use and maintain.

03

The detection element is not in contact with the medium, the performance is stable, and the service life is long. The sensor is installed separately with the detection probe and the vortex generator, and the high-temperature piezoelectric crystal is sealed in the detection probe and does not contact with the measured medium, so the vortex flowmeter has the characteristics of simple structure, good versatility and high stability.

04

Output pulse signal or analog signal proportional to the flow, no zero drift, high precision, convenient and computer networking;

05

Wide measuring range, range ratio up to 1:10;

06

Vortex flowmeter does not need to compensate when measuring volume flow, and the output signal of vortex is actually linear with the flow rate, that is, proportional to the volume flow. The purpose of pressure and temperature compensation is to obtain the density of the fluid, multiplied by the volume flow rate to obtain the mass flow rate, if the measurement of the volume flow of gas does not need to compensate;

07

Low pressure loss. Use the diameter DN50 vortex flowmeter to measure the flow of combustible gas, if the large flow Qmax =200m3/h in the pipeline, the pressure loss of the sensor is: △P =1.08× 10-6ρ v2 (kPa) = 0.605KPa

08

In a certain range of Reynolds number, the flow characteristics are not affected by fluid pressure, temperature, viscosity, density and composition, but are only related to the shape and size of the vortex-generating body.

09

Wide range of applications, steam, gas, liquid flow can be measured;

Specifications

Measuring medium	liquid, gas, saturated steam, superheated steam
Accuracy	liquid±1.0%，gas (steam) ±1.5%，plug-in±2.5%
Working pressure	1.6MPa
Medium temperature	common type-40～150℃ Medium temperature type-40～250℃ high temperature type-40～350℃
Output signal	Three-wire voltage pulse, low level 0 ~ 1V, high level > 4V, duty cycle 50%; Two-wire system standard current 4 ~ 20mA; Three-wire system standard current 0 ~ 10mA
Working environment	-35℃～+60℃，humidness≤95%RH
Working power supply	DC12V；DC24V
Material	carbon steel, stainless steel
Explosion-proof type	Intrinsically safe ExibIICT6

Model Selection

Measuring medium: Vortex flowmeter is a speed flowmeter, its principle, determines its measuring medium type, can be liquid, can also be gas or steam. At present, the vast majority of industrial occasions, such as nitrogen, compressed air, steam, heat conduction oil, etc., mostly use flange connected vortex flowmeter to measure;

Pipe diameter: Flange connected vortex flowmeter can be divided into pipe type and insert type installation according to the different installation methods. For the pipeline type, the pipe diameter is the same as most other flowmeters, the small is DN15, and the large is able to reach DN300. If you need a larger caliber, you can choose to insert the installation, the conventional caliber range can reach DN2000, DN2000 caliber above supply in accordance with the agreement;

Measurement accuracy: The accuracy of the flange connected vortex flowmeter also has several grades, and it is divided according to the measurement medium. If it is to measure liquid, the measurement accuracy can reach 1.0, and if it is to measure gas, the accuracy can reach 1.5. If it is inserted vortex flowmeter, the accuracy can reach level 1.5 and 2.5;

Medium temperature: Generally speaking, it is divided into three ranges, which are divided into normal temperature, medium and high temperature. The temperature range is -40 ~ 100℃(normal temperature), 100 ~ 250℃(medium temperature), 100 ~ 320℃(high temperature). If the field medium temperature is higher, such as some superheated steam, you can use the orifice flowmeter to measure;

Nominal pressure: mainly divided according to the installation method, the main demand on the market is as follows: for example, flange clamp type (2.5MPa), flange connection type (1.0/1.6/2.5MPa), plug-in installation type (1.6MPa/2.5MPa/4.0MPa);

Power supply: According to the current market demand, there are mainly +12VDC(three-wire pulse output), +24VDC(three-wire pulse output type and two-wire current output type)3.6V lithium battery, dual power supply

Output signal: According to the current market demand, the main voltage frequency pulse output, two-wire system 4-20mA output and HART output. In addition, some occasions may require digital output, we can also provide modbus RS485 communication.

Application

Industrial process

Energy measurement

Environmental protection engineering

Transportation

Biotechnology

Scientific experiment

Marine meteorology

Rivers and lakes

Installation

1、When selecting the installation location of the Insertion vortex flowmeter on the pipeline, ensure that the length of the upstream straight pipe section is ≥15D and the downstream straight pipe section is ≥5D.
2、Open a Φ100mm round hole in the pipeline by gas cutting method, and the periphery of the hole should be free of burrs to ensure the smooth passage of the probe.
3、Weld the short flange pipe at the round hole of the pipe. Pay attention to the vertical direction when welding. After welding, the axis of the short flange pipe should be orthogonal to the axis of the pipe, and the extension line of the short flange pipe should pass through the circular center of the transverse surface of the pipe.
4、The determination of the length Y value of the insertion rod under the connection flange of the vortex flowmeter should be based on the actual factory standard, and the user does not need to adjust, such as in special cases, when calculating the insertion depth, the length of the straight pipe section and the working medium can be adjusted appropriately. Generally, when the straight section of the measuring pipe is long enough or the diameter of the measuring pipe is more than 400mm, the average flow rate point measurement method is used first. The measurement accuracy of this method is basically not affected by the change of Reynolds number. The insertion depth of the probe is Y=0.25R-0.25D (R is the radius of the measuring pipe,D is the diameter of the measuring pipe). When the straight section of the measuring pipe is short or the diameter of the measuring pipe is less than 400mm (including 400mm), the central flow point measurement method is used, and the insertion depth is Y=0.5D. After the measurement depth is determined, the length of the insertion rod can be adjusted before installation, and the direction mark of the impact point can be calibrated to ensure that the direction of the vortex generating body is consistent with the flow direction of the measurement pipe according to the requirements of Figure 3. At this time, the flowmeter can be connected with the bolt and fixed on the flange short pipe.
5、The sealing pad should be installed between the flanges, and heat-resistant materials such as rubber plate at normal temperature and asbestos plate at high temperature should be used.
6、Continuous loading and unloading method (with ball valve), when disassembling, first loosen the set screw 4, then loosen the locking nut 5, and then push the insert rod upward until the probe is located in the upper limit position of the ball valve, which is just enough to close the ball valve. Then remove the upper connection flange 8, bolt 12 and nut 11, and then lower the flowmeter end, and install the flowmeter in the opposite order as when disassembling.

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