LUGB type Vortex Flowmeter

Detail

General

The vortex flowmeter is a speed type flow instrument which has a wide range of uses. It is suitable for flow metering, measurement and control of liquids, steam and most gases.

The vortex flowmeter adopts a new design of structure with mechanical shock resistance, impact resistance and stain resistant. It has no moving parts, no wear, and no mechanical maintenance.

The vortex flowmeter has low pressure loss, stable performance, high accuracy. It's of easy installation and use, and sensors and signal converters are interchangeable.

The LUGB type vortex flowmeter is a new type of flowmeter introduced by our company, the design of which is reasonable and the function is powerful, it also has linear correction function, reaching the world advanced level. The flowmeter adopts a high-resolution low-power full dot-matrix LCD display, which is clear and intuitive and it's easy to operate. RS485 or HART communication can meet various needs of users; 12 kinds of compensation algorithms can almost satisfy all flow compensation calculations. Correction curve relying on external data and calibration method based on standard signal lead the trend of instrument calibration.

Features

No moving components, long-term stabilization, structure is simple for easy installation and maintenance
The output of the sensor is the pulse frequency, its frequency is linear with the actual flow rate of the fluid measured, it has no zero drift, and the performance is very stable. The structure is various in the form of pipeline and plug-in type flow sensors;
The accuracy is high, the accuracy of measuring liquid is usually 11.0%, and the accuracy of measuring gas is ±1.5%;
The measurement range is wide, and in the range of reynolds number is 2×104~7×106, it can reach 1:20;
Low pressure loss（about 1 /4-1 /2 of the orifice flowmeter）, which belongs to the energy-saving flow instrument;
The installation method is changeful. It can be installed horizontally, vertically and at different angles according to different process pipelines;
It adopts interference cancellation circuit and anti-vibration sensor head, so it has certain anti-environmental vibration performance;
It adopts ultra-low-power single-chip microcomputer technology. For one 3V10Ah battery, can be used for more than 3 years;
The nonlinearity of the meter coefficient is corrected by software to improve the measurement accuracy;
Adopts EPROM to conduct power fail safeguard to the accumulative flow, and the effective protection time is more than 10 years;

LUGB type Vortex Flowmeter

Fig.1 Relation between Strouhal number (St) and Reynolds number (Re)

Working Principle

The vortex flow sensor is composed of vortex generator, detection probe and corresponding signal amplification circuit.

When the fluid flows through the vortex generator, alternating two rows of vortices will be formed on both sides of the vortex generator. And this vortex is called the Karman vortex street. Based on the theory of Karman vortex street, Stroha proposed that the frequency of the Karman vortex street is proportional to the flow velocity of the fluid, and here is the relationship between frequency and velocity of flow: F=St * V/d

Where：F：Frequency of vortex（Hz）

V：Mean flow velocity on both sides of the vortex generator（m/s）

St： Strohal coefficient (which is constant over a range of Reynolds numbers)

d： Width of the the inflow surface of the vortex generator（m）

LUGB type Vortex Flowmeter

(Fig.2)Schematic diagram of the working principle of a vortex flowmeter

These alternating vortices form a series of alternating fluid lift force that act on a piezoelectric effect-based detection probe to produce a series of alternating charge signals. After the signal is converted, shaped, and amplified by the pre-amplifier, the pulse signal which has the same frequency as the vortex shedding and proportional to the flow rate will be output.

Product Classification

1. Clamp type vortex flowmeter

LUGB type Vortex Flowmeter

Small installation size, simple structure and low cost.

2. Flange type vortex flowmeter

LUGB type Vortex Flowmeter

Integrated flange structure, easy installation, and it is widely used in the measurement of flow of compressed air, saturated and superheated steam, natural gas and various medium.

3. Sanitation type vortex flowmeter

LUGB type Vortex Flowmeter

It is widely used in liquid and steam metering in food and pharmaceutical industries. It can also measure small particles, miscellaneous turbid liquids, and can be used as flow transmitter in automatic control systems.

Technical parameter

1. General technical index

Standard	Vortex Flowmeter JB/T9249-2015
Meter diameter(mm)	15、20、25、32、40、50、65、80、100、125、150、200、250、300
Nominal pressure(M Pa)	1.6MPa、2.5MPa、4.0MPa(other high pressure customizable)
Accuracy class	Liquid:±1%
Accuracy class	Gas or steam:±1.5%,±1%
Range ratio	1:10;1:20;
Sensor material quality	304 stainless steel、316L stainless steel , etc.
Working conditions	Medium temperature:-160℃~+80℃(low temperature) -40℃~+160℃(Normaltemperature) -40℃~+280℃(Mediumtemperature) -40℃~+350℃(Hightemperature)
	Ambient temperature:-20℃~+60℃
	Relative humidity:5~95%RH
	Atmospheric pressure:86~106KPa
Signal output function	Pulse signal、4~20mA signal
Communication output function	RS485 communication、 HART communication
Working power supply	External power supply：24VDC(±15%), applicable for pulse output, current output, communication output type Internal power supply：3.6V 10AH lithium battery
Signal line interface	Explosion-proof type：Internal thread M20×1.5
Explosion-proof grade	Explosion-proof grade:ExdIICT6
Protection grade	Protection grade:IP65(higher level customizable)

2. Electrical performance and functional indexes

ower supply voltage	12V~32V DC;
Influence of power supply change	No more than 0.01%/V;
Electrostatic discharge immunity	3 level:Ia contact 6KV,Ib air 8KV
Power frequency magnetic field immunity	3 level:Stable continuous magnetic field experiment, strength is 10A/m
Surge immunity	Differential-mode 2 level:1kv,common mode 3 level:2kv
Pulse group immunity	2 level:In the power supply port, protective ground, voltage peak 1KV, repetition frequency 5 or 100kHz; in the input and output signals, data and control ports, voltage peak 0.5KV, repetition frequency 5 or 100kHz; Not more than 0.05% (50~1000 ohms, lower limit and range change);
Alarm	Set upper and lower limits of the alarm. Lower than the lower limit output 3.8mA; higher than the upper limit output 22mA;
Monitoring dynamic variables	Instantaneous flow rate, percentage, output current, cumulative flow rate, frequency, etc.
Flow calibration	The K value of the instrument coefficient can be corrected by the 2~5 point;
Local configuration function	Configuration of engineering unit, measured medium, medium density, range, display, alarm value, etc., and it has cumulative flow clearing and data recovery functions;
LCD	With backlight and sign, and three-line display. A variety of engineering units can be displayed.
Data backup and recovery	The manufacturer can back up the configuration information such as the range before delivery. If the meter is not working properly due to users' fail, it can be restored to the factory state.
Defensive function	The instrument has the function of power failure protection and traffic accumulation.

LUGB measurement range and working pressure

1、General liquid and gas applicable flow range

Meter diameter (mm)	Liquid measurement range(m3/h)	Gas measurement range(m3/h)	Connection mode	compression resistance grade(MPa)
DN15	1.2-6.2	5-25	Flange clamping / Flange connection	2.5/1.6
DN20	1.5-10	8-50	Flange clamping / Flange connection	2.5/1.6
DN25	1.6-16	10-70	Flange clamping / Flange connection	2.5/1.6
DN32	1.9-19	15-150	Flange clamping / Flange connection	2.5/1.6
DN40	2.5-26	22-220	Flange clamping / Flange connection	2.5/1.6
DN50	3.5-38	36-320	Flange clamping / Flange connection	2.5/1.6
DN65	6.2-65	50-480	Flange clamping / Flange connection	2.5/1.6
DN80	10-100	70-640	Flange clamping / Flange connection	2.5/1.6
DN100	15-150	130-1100	Flange clamping / Flange connection	2.5/1.6
DN125	25-250	200-1700	Flange clamping / Flange connection	1.6/1.6
DN150	36-380	280-2240	Flange clamping / Flange connection	1.6/1.6
DN200	62-650	580-4960	Flange clamping / Flange connection	1.6/1.6
DN250	140-1400	970-8000	Flange clamping / Flange connection	1.6/1.6
DN300	200-2000	1380-11000	Flange clamping / Flange connection	1.6/1.6

Note: The frequency in the table is theoretical value. The test condition for the flow range of the liquid is normal temperature water. （t=20℃， =1000Kg/m3）. The test condition for the gas using this measurement range is normal temperature and normal pressure air. （t=20℃，P=101.325Kpa， =1.205 Kg/m3） B. Convert volume flow which is known under standard conditions into volume flow under working conditions The measurement unit of general gas is usually a volume measurement unit under standard conditions, that is, standard cubic meter / hour (Nm3 / h), referred to as " standard volume ". First, convert the standard state volume flow to the working condition volume flow according to the following formula, that is cubic meters per hour (m3/h), then compared with the applicable flow range of Table 2.

LUGB type Vortex Flowmeter

Absolute pressure MPa	0.2	0.3	0.4	0.5	0.6	0.7	0.8	0.9	1.0	1.1	1.2	1.3	1.4	1.5	1.6	1.7	Flow unit Kg/h
Temperature℃	120	133	144	152 159		185 170 175 180 184 189 192 195 198 201 204
Density Kg/m3	1.13	1.86	2.18	2.67 3.17		3.67 4.16 4.66 5.15 5.64 6.13 6.62 7.11 7.6 8.09 8.58
DN20 Qmin	6.22	9.13	12	14.7 17.4		20.2 23 25.6 28.3 31 33.7 36.4 39 41.8 44.5 47.2
Qmax	56.5	83	43.6	133.5 158.5		183.5 208 233 257.5 282 306.5 331 355.5 380 404.5 429
DN25 Qmln	9.6	14	16.53	22.7 27		31.2 35.3 39.6 43.7 48 52 56.2 60.4 64.6 68.7 72.9
Qmax	79.1	118.2	152.6	186.9 222		256.9 291.2 326.2 360.5 394.8 429.1 463.4 498 532 566.3 600.6
DN40 Qmin	24.9	36.5	48	58.7 69.7		80.7 91.5 102.5 113 124 135 145.6 156.4 167.2 180 188.8
Qmax	249	365	480	587 697		807 915 1025 1130 1240 1350 1456 1564 1672 1800 1888
DN50 Qmln	40.7	59.8	78.5	96 114		132 150 168 185 203 221 238 256 274 291 309
Qmax	362	531	698	854 1014		1174 1331 1491 1648 1805 1962 2118 2275 2432 2589 2748
DN65 Qmin	56.5	83	109	133.5 158.5		183.5 208 233 257.5 282 306.5 331 355.5 380 404.5 429
Qmax	542	797	1046	1282 1522		1762 1997 2237 2472 2707 2942 3178 3413 3648 3883 4118
DN80 Qmln	79	116	153	187 222		257 291 328 361 395 429 483 498 532 566 600
Qmax	723	1062	1395	1709 2029		2349 2882 2982 3296 3810 3923 4237 4550 4884 5178 5491
DN100 Qmin	147	216	283	347 412		477 541 606 670 733 797 861 924 988 1052 1115
Qmax	1243	1826	2398	2937 3487		4037 4576 5126 5665 6204 6743 7282 7821 8360 8899 9348
DN125 Qmln	226	332	436	534 634		734 832 932 1030 1128 1226 1324 1422 152016181716 1716
Qmax	1921	2822	3708	4539 5389		8239 7022 7922 8755 9588 10421 11254 12087 12920 1375314586
DN150 Qmin	316	465	610	748 888		1028 1165 1305 1442 1579 1716 1854 1991 2128 2265 2402
Qmax	2531	3718	4883	5981 7101		8221 9318 10438 11536 12634 13731 14829 15926 17024 51812219209
DN200 Qmln	655 963 1284 1549 1839 2129 2413 2703 2987 3271 3555 3840 4124 4408 4692 4978
Qmax	5605 8234 10813 13243 15723 18203 20834 23114 25544 27974 30405 32835 35266 37896 4012642557
DN250 Qmin	1096 1610 2115 2590 3075 3580 4035 4520 4996 5471 5946 6421 6683 7322 7847 8323
Qmøx	9040 17440 21360 25360 2936033280 37280 41200 4512049040 52960 56880 60800 6472068640
Dn300 Qmln	1560 2290 3008 3884 4375 5056 5741 6431 7107 7783 8459 9136 9812 10488 1116411840
Qmax	12430 23980 29370 34870 4037045760 51260 56650 62040 67430 72820 78210 83600 8899093480

Superheated steam density table

Temperature ℃ Absolute pressure MPa	140	180	220	260	300	340	380	420	460
0.15	0.78	0.71	0.65	0.6	0.56	0.52	0.49	0.46	0.44
0.2	1.05	0.95	0.87	0.8	0.75	0.7	0.65	0.62	0.58
0.25	1.32	1 .19	1.09	1	0.93	0.87	0.82	0.77	0.73
0.3	1.59	1.43	1.31	1.21	1.12	1.05	0.98	0.93	0.87
0.36	1.92	1.73	1.58	1.45	1.35	1.26	1.18	1.11	1.05
0.4		1 .93	1.75	1.62	1.5	1.4	1.31	1.23	1.16
0.5		2.42	2.2	1.99	1.88	1.72	1.64	1.54	1.46
0.6		2.93	2.66	2.44	2.26	2.1	1.97	1.85	1.75
0.7		3.44	3.11	2.86	2.64	2.46	2.3	2.16	2.04
0.8		3.96	3.58	3.27	3.02	2.82	2.64	2.48	2.34
0.9		4.5	4.04	3.69	3.41	3.17	2.98	2.79	2.63
1		5.04	4.52	4.12	3.8	3.53	3.5	3.1	2.93
1.4			6.46	5.85	5.37	4.98	4.65	4.37	4.05
1.8			8.51	7.64	7	6.46	6.02	5.64	5.31
2			9.58	8.56	7.81	7.21	6.71	6.28	5 .91
2.4				10.45	9.48	8.72	8.1	7.57	7.12
2.8				12.41	11 .19	10.26	9.51	8.88	8.34
3.2				14.46	12.94	11.83	10.94	10.2	9.57
3.6				16.61	14.76	13.43	12.39	11.54	10.91

E. Calculation of pressure loss

Whether the pressure loss affects the process pipeline is calculated by the following formula:

LUGB type Vortex Flowmeter

Service Guarantee

Service Content

Noncon Instrument provides comprehensive pre-sales and after-sales services, including product selection guidance, on-site technical support, installation guidance, and product quality assurance based on customer needs. The company promises a maximum product quality assurance period of 24 months and lifetime free product calibration services to ensure maximum customer benefits.