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Beijing Zhisheng Weihua Chemical Co., Ltd

E-mail
2880442903@qq.com
Phone
15810936203
Address
108A, Liandong U Valley West District, Majuqiao Town, Tongzhou District, Beijing

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vortex flow meter

NegotiableUpdate on 01/20

Model

Nature of the Manufacturer: Producers

Product Category

Place of Origin

Online Consult

Overview

Application characteristics: LUDC series vortex flow transmitter, mainly used for flow measurement of industrial pipeline fluid media, such as gas, liquid, steam and other media

Product Details

Usage characteristics

The LUDC series vortex flow transmitter is mainly used for measuring the flow of fluid media in industrial pipelines, such as gases, liquids, steam, and other media.Its characteristics are small pressure loss, large measurement range, high accuracy, and almost no dependence on fluid density, pressure, temperature, viscosity and other parameters when measuring volumetric flow rate under working conditionsThe impact. No movable mechanical parts, therefore high reliability and maintenance requiredSmall. The instrument constant can remain stable for a long time. The plug-in instrument is installed at the insertion port of the pipeline,Ball valves can be continuously loaded and unloaded.To facilitate regular cleaning and maintenance when operating in dirty media. This instrument adopts a piezoelectric stress sensor with high reliability and can operate within a temperature range of -20 ℃ to+300 ℃. There are simulations availableStandard signals, as well as digital pulse signal outputs, are easily compatible with digital systems such as computers, making them a relatively advanced choiceIdeal flow meter.

working principle

When a cylindrical resistance body is vertically inserted into a fluid, vortices are alternately generated on both sides, and as the fluid moves downstream,

The formation of a vortex column is called a Karman vortex street, as shown in Figure 1. The resistance body that generates vortex streets is called a vortex generator. Experimental results have shown that the frequency of vortices is directly proportional to the flow velocity,

It can be expressed as follows:

Experimental evidence shows that when the distance h between two columns of vortices and the distance L between two vortices in the same column satisfy the formula h/L=0.281, asymmetric vortices

The vortex column can maintain a stable state. When the Reynolds number Re of the fluid is in the range of 5000-150000, Sr remains basically unchanged, so when vortices occur

When the cylinder width d and Strouhal number Sr are constant, the frequency f of the vortex generator is proportional to the average flow velocity of the fluid, that is, proportional to the flow Q and proportional to

Pressure, temperature, density and other parameters are irrelevant.

When vortices are generated on both sides of the cylinder, the sensor is subjected to alternating lift perpendicular to the flow direction, generating a signal. The frequency of the change in lift is

Vortex frequency, the sensor amplifies and shapes the signal to obtain a pulse signal that is linearly proportional to the flow velocity, which is directly output or converted into

The relationship between the flow rate Q and frequency f for the 4-20mA standard signal output is as follows:

Technical parameters of LUDC series vortex flowmeter

instrument model			LUDC
measuring medium			Gas, liquid, steam
Caliber specifications	Flange card mounted caliber specification		15，（20），25，32，40，50，65，80，100，125，150
	Flange connected caliber specification		125, 150, 200, 250 （350）
	Insertion caliber specification		200-2000
Flow measurement range	Normal measurement flow rate range		Reynolds number 1.5 × 104-4 × 106; Gas 5-50m/s; Liquid 0.5-7m/s.
	Normal measurement flow range		The measurement range of liquid and gas flow rates is shown in Table 2; The steam flow range is shown in Table 3; The range of plug-in flow is shown in Table 4
measurement accuracy			Flange card type and flange type are liquid level 1 and gas level 1.5
			The accuracy of the plug-in measuring head is level 1, and the accuracy of inserting it into industrial pipelines is ≥ level 2.5
Temperature of the measured medium			Normal temperature -25 ℃ -80 ℃ High temperature -25 ℃ -250 ℃ or -25 ℃ -300 ℃
work pressure			1.6MPa; 2.5MPa； 4.0MPa (can be produced according to ordering requirements)
output signal (Signal line interface H20 × 1.5 internal thread)		Pulse voltage output signal	High level 8-10V, low level 0.7-1.3V (explosion-proof model: high level 4-5V, low level 0.7-1.3V)
			The pulse duty cycle is about 50%, and the transmission distance is 100 meters.
		Standard current output signal	DC4-20Ma allows external load resistance less than 600 Ω (power supply DC24V), with a transmission distance of 3000 meters.
Instrument usage environment			Temperature: -25 ℃ -+55 ℃ Humidity: 5-90% RH50 ℃
material			The body is made of stainless steel 304, and the converter housing is made of aluminum alloy.
power supply			DC12V±10% DC24V±10%; Lithium battery 3.6V
Explosion-proof rating			Intrinsically safe explosion-proof Exia Ⅱ CT1-T5, explosion-proof Exd Ⅱ BT4
Protection level			IP65
Requirements for front and rear straight pipe sections			Refer to Tables 7 and 8

Flow range of liquid and working gas

path

100

125

150

200

250

300

liquid

m3/h

0.3-3

0.5-5

1.2-12

1.5-15

2.2-22

4-40

6-60

9-90

14-140

22-220

35-350

65-650

120-1200

180-1800

gas

m3/h

5-30

5.5-56

10.2-80

15-150

22-220

35-350

60-600

90-900

140-1400

220-2200

300-3000

550-5500

1100-11000

1500-15000

Saturated steam flow range

Table 3

Path diameter	25mm		32mm		40mm		50mm		65mm		80mm		100mm		125mm		150mm		200mm		temperature ℃	Density kg/m ³
pressure	minimum		minimum		minimum		minimum		minimum		minimum		minimum		minimum		minimum		minimum		temperature ℃	Density kg/m ³
0.1	20	101	22.5	150	36	229	59	358	93	600	129	917	220	1.43	348	2.25	479	3.22	840	5.73	120.1	1.126
0.2	21	136	29.5	210	47	333	77	520	124	880	168	1.33	288	2.08	463	3.30	628	4.68	1.10	8.34	133.3	1.638
0.3	24	151	36	280	56	436	92	680	152	1.15	201	1.74	345	2.78	567	4.30	750	6.13	1.32	11.0	143.2	2.140
0.4	27	186	42	340	65	536	105	836	171	1.40	231	2.14	396	3.39	640	5.24	862	7.54	1.51	13.6	151.4	2.635
0.5	30	248	46	410	72	636	118	994	188	1.69	259	2.55	444	3.98	691	6.23	966	8.95	1.70	15.9	158.3	3.127
0.6	34	256	50	470	80	733	130	1.15	206	1.95	285	2.94	489	4.66	766	7.20	1.07	10.3	1.87	18.6	164.4	3.615
0.7	37	325	54	530	87	833	142	1.30	225	2.20	310	3.34	531	5.22	832	8.15	1.16	11.7	2.03	20.9	169.8	4.099
0.8	39	325	58	600	93	931	152	1.45	243	2.47	334	3.73	572	5.91	888	9.10	1.25	13.1	2.19	23.6	174.7	4.581
0.9	42	394	62	650	100	1.03	163	1.61	253	2.73	357	4.12	612	6.44	936	10.0	1.34	14.5	2.34	25.8	179.2	5.064
1.0	45	441	66	720	106	1.13	173	1.76	272	3.00	379	4.51	650	7.16	1.00	11.0	1.42	15.8	2.49	28.6	183.3	5.553
1.1	47	479	70	780	112	1.23	183	1.92	289	3.26	401	4.91	687	7.67	1.07	12.0	1.50	17.3	2.63	30.7	187.2	6.033
1.2	50	463	73	850	118	1.32	193	2.05	306	3.50	422	5.29	723	8.40	1.12	13.0	1.58	18.5	2.76	33.6	190.8	6.509
1.3	52	555	77	910	123	1.42	202	2.22	314	3.77	422	5.68	757	8.88	1.17	13.9	1.65	20.0	2.89	35.5	194.2	6.980
1.4	54	593	79	970	129	1.51	211	2.37	328	4.00	461	6.07	792	9.49	1.22	14.8	1.73	21.3	3.02	37.6	197.5	7.456
1.5	57	630	82	1.00	135	1.60	219	2.52	341	4.30	481	6.47	825	10.3	1.26	15.8	1.80	22.6	3.15	41.4	200.5	7.934
1.6	59	669	86	1.10	140	1.71	229	2.68	353	4.55	501	6.86	858	10.7	1.31	16.8	1.87	24.1	3.28	42.9	203.5	8.419
1.7	61	707	89	1.15	146	1.81	237	2.83	365	4.80	519	7.24	890	11.3	1.36	17.7	1.94	25.9	3.40	45.3	206.2	8.897
1.8	63	746	93	1.22	151	1.91	246	2.98	385	5.07	538	7.64	922	11.9	1.41	18.7	2.01	26.9	3.53	47.8	208.9	9.388
1.9	66	784	96	1.28	155	2.01	254	3.14	395	5.33	556	8.03	954	12.6	1.46	19.6	2.08	28.3	3.65	50.0	211.5	9.868
2.0	68	822	98	1.35	161	2.10	262	3.27	404	5.60	574	8.43	985	13.2	1.50	20.6	2.15	29.6	3.76	53.5	213.9	10.35
3.0	87	1.21	128	1.98	207	3.10	338	4.84	532	8.21	743	12.4	1.27	19.3	1.95	30.3	2.78	43.5	4.86	77.4	234.6	15.21
4.0	106	1.61	158	2.60	251	4.11	409	6.43	647	11.0	898	16.5	1.53	25.7	2.40	40.2	2.35	57.8	5.87	102.8	250.7	20.21
4.3	111	1.73	161	2.80	264	4.43	429	6.91	666	11.6	942	17.7	1.61	27.7	2.47	43.0	3.52	62.2	6.17	110.6	254.9	21.74

Note: 1. The units of gray shaded data in the table above are t/h, while the units of other data are kg/h. The unit of pressure is MPa.
2. If the diameter is greater than 200mm, the range of steam flow can be measured by multiplying the gas flow rate of the corresponding diameter by the steam density at the corresponding pressure and temperature.

Flow Range Table 4 of Liquid (Gas, Steam) Insertion Vortex Flow Meter

Diameter (mm) DN	Liquid (m ³/h)		Gas (m ³/h)		Diameter (mm) DN	Liquid (m ³/h)		Gas (m ³/h)
Diameter (mm) DN	minimum		minimum		Diameter (mm) DN	minimum		minimum
200	55	570	560	4530	900	1145	11450	11450	91605
250	88	885	880	7070	1000	1410	14140	14135	113095
300	125	1275	1270	10180	1100	1710	17110	17100	136840
350	170	1735	1730	13860	1200	2035	20360	20230	162850
400	225	2265	2260	18100	1300	2385	23895	23890	191125
450	286	2870	2860	22905	1400	2770	27710	27705	221660
500	350	3540	3530	28275	1500	3170	31800	31700	254455
600	505	5090	5085	40715	1600	3610	36200	36105	289510
700	690	6930	6925	55420	1800	4580	45850	45750	366410
800	900	9050	9045	72380	2000	5650	56550	56545	452365

Structure and dimensions

This series of vortex street transmitters has three connection methods and external dimensions
Flange card installation type
Mainly used for full tube vortex street meters with diameters ranging from 15 to 100. Refer to Figure 3 and Table 5
Flange connection type
Mainly used for full tube vortex street meters with diameters ranging from 125 to 350. Refer to Figure 3 and Table 5
plug-in
Mainly used for large-diameter pipelines with diameters ranging from 200 to 2000. Refer to Figure 4 on the right
Ball valves are mainly used for continuous flow loading and unloading, and are convenient for regular operation in dirty media
Cleaning and maintenance. Provided by users as needed)

Dimensions of flange mounted and flange connected vortex street transmitters

Surface type	Nominal Diameter mm	pressure rating MPa	L mm	G		D mm	D1 mm	N-d2	d mm	b mm	weight Kg
Surface type	Nominal Diameter mm	pressure rating MPa	L mm	room temperature	high temperature	D mm	D1 mm	N-d2	d mm	b mm	weight Kg
Flange card installation type	15(20)	4.0	66	280	500	65	－	－	15	－	7.5
	25	4.0	66	280	500	65	－	－	25	－	7
	32	4.0	66	285	505	72	－	－	32	－	10
	40	4.0	70	290	510	80	－	－	40	－	11
	50	4.0	85	295	515	90	－	－	50	－	12.5
	65	2.5	98	310	530	105	－	－	65	－	17
	80	2.5	110	320	540	120	－	－	80	－	20
	100	2.5	110	330	550	150	－	－	100	－	27
	125	1.6	115	340	560	164	－	－	125	－	30
	150	1.6	130	350	570	188	－	－	150	－	35
Flange connection type	125	1.6	250	323	545	245	210	8－φ18	125	26	22
	150	1.6	300	335	555	280	240	8－φ23	150	28	24
	200	1.6	320	370	590	335	295	12－φ23	200	30	31
	250	1.6	320	400	620	405	355	12－φ25	250	32	40
	300	1.6	320	420	640	460	410	12－φ25	300	32	48

Special pressure levels require customization

Model selection and description

model	Basic code									Explanation
LUDC										Basic model of stress type vortex street transmitter
connection method	-1									flanged
	-2									Flange card installation type
	-3									plug-in
Tested medium		2								liquid
		3								gas
		4								saturated steam
		4G								superheated steam
		5								hot water
Path marking			-xxx							Please refer to the nominal diameter table for details
output signal				-0						No signal output
				-3						Three line to pulse
				-4						2-line system 4-20mA
Header indication					N					No indicator header
					B					Double row LCD display intelligent meter head (instantaneous, accumulated flow)
Connect power supply						x				12V DC (only equipped with three wire pulse output)
						y				24V DC
						z				Battery (only equipped with intelligent digital display meter B)
Table body material							-C			OCr18Ni12Mo2Ti (316)
							-D			1Cr18Ni9Ti (304)
pressure								1		1.6MPa (DN65-200)
								2		2.5MPa (DN15-50)
								3		4.0MPa (DN15-50)
explosion-proof performance									-N	none
									-Bi	Intrinsic safety explosion-proof type
									-Bd	flameproof type

Diameter (mm)	15	20	25	32	40	50	65	80	100	125	150	200	250	300	350	400	450	500
logo	001	0012	002	003	004	005	006	008	010	012	015	020	025	030	035	040	045	050

path (mm)	600	700	800	900	1000	1100	1200	1300	1400	1500	1600	……	2000
logo	060	070	080	090	100	110	120	130	140	150	160	……	200