LUGB pipeline vortex flowmeter

LUGB pipeline vortex flowmeter
 

Product description:

I. Overview
JC- LUGB vortex flowmeter to measure gas according to Carmen (Karman) vortex principle, volumetric flow meter steam or liquid volume flow, standard condition volume flow or mass flow. And as flow transmitters used in automation control system.
The instrument uses advanced differential technology, with isolation, shielding, filtering and other measures to overcome the shock of similar products and poor, small-signal data disorders and other problems, and uses a unique sensor packaging technology and protective measures to ensure product reliability The product has two basic and complex forms, basic measuring single flow signal; complex can be achieved simultaneously measure temperature, pressure, flow of each form has a whole sub-structure, in order to adapt to different installation environment.
Second, the principle


Vortex flowmeter is when the body fluid flows through the vortex, its sides formed two rows of alternating vortex body, detection probe and the corresponding electronic circuits and other components in the flow field by the design of the vortex., Which Species vortex is called Karman vortex Strouhal on the basis of Karman vortex theory proposed the velocity is proportional to the frequency of Karman vortex fluid, and gives the frequency and velocity relationship:
f = St * V / d where:
Vortex frequency of f (Hz)
The average flow rate in both sides (m / s) V vortex
St Strouhal coefficient (constant)
These alternating vortices to form a series of alternating negative pressure; the pressure acting on the detection probe; they produce a series of alternating electrical signal; after preamplifier conversion; shaping; after the enlargement process; output and synchronized into a vortex proportional pulse frequency signal (or standard signal).
Third, the instrument characteristics and uses
Features:
· No moving parts; long-term stability; simple structure, easy installation and maintenance;
* Use interference cancellation circuit and vibration sensor head, with a certain resistance to environmental vibration performance;
· Ultra-low-power single-chip microprocessor technology Section 1 3.2V10AH lithium battery can use more than 5 years;
· By software on the instrument coefficient nonlinear correction, improve the measurement accuracy;
Pressure loss, wide range;
Adopt EEPROM cumulative traffic brownout protection, protection longer than 10 years;
use:
The instrument can be widely used in large, medium and small variety of pipes for drainage, industrial recycling, waste water treatment, oil and chemical reagents as well as compressed air, saturated and superheated steam metering, gas and a variety of media traffic.

Details
First, the technical parameters
Table 1

Nominal by (mm)

15202540506580100125150200250300

Meter Materials

1Cr18Ni 9Ti

Nominal pressure (Mpa)

PN1.6Mpa; PN2.5Mpa; PN4.0Mpa

Measured medium temperature (℃)

-40~+250℃ ; -40~+350℃

Environmental conditions

Temperature -10 ~ + 55 ℃; Relative humidity 5% to 90%; Atmospheric pressure 86 ~ 106Kpa

Accuracy class

± 0.5 Indication of: measuring liquid
Measuring gas or steam: Indication of ± 1.0, ± 1.5

Turndown ratio

1: 10; 1: 15

Resistance loss coefficient

Cd (2.6

output signal

Sensor: Pulse frequency signal 0.1 ~ 3000Hz low ≤1V high ≥6V
Transmitter: two-wire 4 ~ 20mADC current signal

Power supply

Sensor: + 12VDC, + 24VDC (optional)
Transmitter: + 24VDC
Site display type: the instrument comes with 3.2V lithium battery

Signal transmission lines

STVPV3 * 0.3 (three-wire), 2 * 0.3 (two-wire)

Transmission distance

≤500m

Signal line interface

Internal thread M20 * 1.5

Explosion levels

ExdIIBT6

Protection class

IP65

Allow vibration acceleration

1.0g

Second, the instrument selection
A. General of liquids and gases used in flow ranges are shown in Table 2
Table 2
caliber
(Mm)

liquid

gas

Flow rate (m3 / h)

Frequency (Hz)

Flow rate (m3 / h)

Frequency (Hz)

20

1~10

40~396

5.5~50

218~1982

25

1.6~16

32~325

8.5~70

172~1420

40

2.5~25

13~130

22~220

115~1147

50

3.5~35

9~93

36~320

96~854

65

6.5~68

8~82

50~480

61~583

80

10~100

6~65

70~640

45~417

100

15~150

5~50

130~1100

43~367

125

27~275

5~47

200~1700

33~290

150

40~400

4~40

280~2240

27~221

200

80~800

3~33

580~4960

24~207

250

120~1200

3~26

970~8000

20~171

300

180~1800

2~22

1380~11000

17~136


* * Table frequency of the theoretical value. Liquid flow rate range using the test conditions is water at room temperature (t = 20 ℃, ρ = 1000Kg / m3). The measuring range of the gas using the test conditions are normal temperature and pressure air (t = 20 ℃ , P = 101.325Kpa, ρ = 1.205 Kg / m3)

  1. B. volume flow under standard conditions known in terms of the volume of traffic conditions
Unit of measure commonly used in the standard state general gas volume unit of measurement that is standard cubic meters / hour (Nm3 / h), referred to as the 'standard way' according to the following equation first volumetric flow rate to the standard state state volume flow conditions, namely cubic meters / hour (m3 / h) and then used in flow ranges and Table 2 for comparison.

Where: Q work : Volume flow measured medium conditions state (m.3/h)
Q Mark : Volume flow measured medium state standard conditions (Nm. 3 / H, 20 ℃, under 0.1013MPa absolute pressure)
T Mark : Medium temperature measured medium conditions state (293.15K).
P work : Medium pressure measured medium conditions state, gauge (MPa).

  1. C. for saturated steam, according to Table 3 for the range of mass flow control selection.
    D. For superheated steam, superheated steam should first control (Table 4) to detect the corresponding temperature and pressure (to take absolute pressure: gauge pressure +1) density values, and then a given mass flow rate calculated by the following formula the corresponding volume of traffic, and then with Table 2 corresponding diameter gas flow control selection.

    Saturated steam flow range
    TABLE 3

    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

    Temperature ° C

    120

    133

    144

    152

    159

    165

    170

    175

    180

    184

    189

    192

    195

    198

    201

    204

    Density Kg / m3

    1.13

    1.66

    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

    Kg / h

    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

    Qmin

    9.6

    14

    18.53

    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

    116.2

    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

    Qmin

    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