Split electromagnetic flowmeter

Split electromagnetic flowmeter
 

Product description:

I. Overview
LDBE intelligent electromagnetic flowmeter consists of two parts, the sensor and converter. It is based on the work of Faraday's law of electromagnetic induction, used to measure the conductivity is greater than 5μS / cm conductive liquid volume flow, is an electrically conductive medium volume flow measurement sensors instrument. In addition to measure the volume flow of conductive liquid, can also be used to measure the volumetric flow uniformity Mushy suspension liquid acid and alkali and other strong corrosive liquids and slurries, pulp, paper pulp, etc. it is widely used in petroleum, chemical , flow measurement metallurgy, textile, paper making, environmental protection, food industry and municipal administration, water conservancy construction, river dredging and other fields.

(Applications)
Because electromagnetic flowmeter has its unique advantages, it is widely used in chemical fiber, food, paper, sugar, mining, water supply, environmental protection, water hydraulic, steel, petroleum, pharmaceutical and other industrial areas to measure acid, alkali, salt solution, slurry, pulp, paper pulp, coal water slurry, corn syrup, fiber pulp, grain syrup, lime, sewage, cooling raw water, drainage, saline, hydrogen peroxide, beer, wort, various beverages, liquor, green liquor and other conductive liquid medium volume flow.


Second, the principle
According to Faraday's principle of electromagnetic induction; in the measuring tube axis and the magnetic field lines perpendicular to the wall of a pair of detecting electrodes installed; when the conductive liquid tube axis motion along the measurement; conductive liquid cutting magnetic field lines generated EMF; this EMF by two detection electrode detected; numerical size is proportional to the flow rate; its value:
E = KBVD
Where:
E- EMF;
K- and field distribution and axial length of the relevant factors;
B- magnetic induction;
V- conductive liquid average velocity;
D- electrode spacing; (measuring tube inside diameter)
E EMF sensor as a flow rate signal is transmitted to the converter, amplified, filtered transformed by a series of digital processing, with dot-matrix LCD with backlight display instantaneous flow rate and cumulative flow. The converter has 4 ~ 20mA output, alarm output and frequency output and a RS-485 communication interface, etc., and supports HART and MODBUS protocol.
Third, the instrument characteristics
• Fully digital processing; anti-jamming; reliable measurement; high precision; flow measurement range up to 150: 1;
• Ultra-low EMI switching power supply; for a wide range of supply voltage variation; anti-EMI performance is good;
• 16-bit embedded microprocessors; computing speed; high precision; programmable frequency low-frequency square wave excitation; improve the flow measurement
Stability, low power consumption;
• using SMD devices and surface mount (SMT) technology, circuit reliability;
• No moving parts inside the pipe; unimpeded flow of parts; measuring almost no additional pressure loss;
• In the field online range according to actual needs of users;
• measurements and velocity distribution; fluid pressure; viscosity physical parameters; temperature; density;
• High-resolution backlit LCD display; full Chinese menu operation; easy to use; simple to operate; easy to learn;
• With RS485; RS232; Hart and Modbus and other digital communication signal output; (optional)
• A self-test and self-diagnostic function;
• the total amount of hours recording function; in hours record total traffic; for hourly metering system (optional);
• interior has three totalizer can show a positive cumulative amount cumulative amount and the difference between the reverse volume totalizer; internal clock has not brown; can be recorded
Record 16 power-down time (optional).;
• Infrared handheld operator; 115KHZ communication rate; remote non-contact operation converter all functions (optional).

Details
First, the technical parameters
Table 1
Nominal Diameter (mm)
(Special specifications can be customized)
Pipeline tetrafluoroethylene lining: DN10 ~ DN600
Pipeline rubber lining: DN40 ~ DN2200
Flow direction

Positive; anti; net flows

Turndown ratio

150: 1

Repeatability error

± 0.1% of measured value

Accuracy class

Pipeline: 0.5, 1.0

Measured medium temperature

Ordinary rubber lining: -20 ~ + 60 ℃

High temperature rubber lining: -20 ~ + 90 ℃

PTFE lining: -30 ~ + 100 ℃

High temperature tetrafluoroethylene lining: -20 ~ + 180 ℃

Rated working pressure
(High voltage can be customized)

DN10-DN150: ≤1.6MPa

DN200-DN350: ≤1.0MPa

DN400-DN1000: ≤0.6MPa

DN450-DN2200: ≤0.25MPa

Flow range

0.1-15m / s

Conductivity range

Measured fluid conductivity ≥5μs / cm

Signal output

4 ~ 20mA (load resistance 0 ~ 750Ω), pulse / frequency control level

Communication output

RS485; MODBUS protocol; HART protocol

Power supply

AC220V or DC24V

Length of straight pipe requirements

Upstream ≥5DN, downstream ≥2DN

Connection

Adopt flange connection between meter and piping, flanges meet the national standard: GB / T9115.1-2000

Explosion levels

ExdeiallBT4-T6

Protection class

IP65, up to IP68 special order

Ambient temperature

-25~+60℃

Relative humidity

5%~95%

Total power consumption

Less than 20W


Second, the instrument selection
1. Selection Code
Table 2
model Explanation
JC-LDBE-

-•

-•

Path

10-2200mm

combination

S

Compact

L

Sub-body

Electrode material

M

stainless steel

T

Ti (titanium)

D

Ta (tantalum)

H

Hastelloy

P

Pt platinum

N

Ni Ni

Output

0

No output

1

4-20mA / 1-5KHz

2

4-20mA

Lining material

X

rubber

F

Polytetrafluoroethylene

P

Polyethylene

J

Polyurethane Rubber

Local display

0

No local display

1

Local display

communication method

0

No communication

1

RS485

2

RS232

3

Modbus

4

Hart

Grounding Ring

0

No grounding ring

1

Grounding ring

2

The ground electrode

The upper limit of the flow rate

(n)

The upper limit of the flow rate (range) m3 / h

Example: use of a local display type electromagnetic flowmeter sewage pipes for the user DN50, requires rubber lining materials, stainless steel electrodes, 4 ~ 20mA output, no communications, the upper limit of the flow rate of 30m3 / h model should:. JC-LDBE -50S-M1X100-30
2. Selection Description:
OK meter diameter: Refer to Table 3
TABLE 3

Diameter (mm)

10

15

20

25

32

40

50

65

Qmin (m3 / h)

0.05

0.1

0.3

0.4

0.8

1.2

2

3

Qmax (m3 / h)

3.5

8

15

22

35

55

95

150

Diameter (mm)

80

100

125

150

200

250

300

350

Qmin (m3 / h)

5

8

12

18

25

35

50

60

Qmax (m3 / h)

220

350

550

800

1400

2200

3200

4500

Diameter (mm)

400

450

500

550

600

700

800

900

Qmin (m3 / h)

80

120

180

230

300

400

500

600

Qmax (m3 / h)

5500

7500

9000

11000

13000

16600

21700

27468

Diameter (mm)

1000

1100

1200

1400

1600

1800

2000

2200

Qmin (m3 / h)

800

1000

1200

1600

2100

2700

3300

4000

Qmax (m3 / h)

33900

41000

48800

66400

86800

109000

135000

164000


Determined lining material: Please refer to Table 4
Table 4

Lining material

name

symbol

performance

The maximum operating temperature

For the liquid

rubber

Neoprene

CR

Moderate abrasion resistance is generally low concentrations of acid salt corrosion

(60℃

Water; industrial water; seawater

Polyurethane Rubber

PU

Excellent wear resistance, acid and alkali poor performance

(60℃

Pulp, pulp slurry, etc.

Fluorine plastic

Polytetrafluoroethylene

F4 or PTFE

Chemical properties is very stable; resistant to boiling hydrochloric acid; sulfuric acid; aqua regia; concentrated alkali corrosion

(160℃

Corrosive liquid acid salt

Poly FEP translation:
Teflon FEP

F46 or FEP

Chemical properties equivalent to F4
Compressive strength, tensile strength than 4

(120℃

Corrosive liquid acid salt

And ethylene tetrafluoroethylene copolymer

F40 or ETFE

Chemical properties equivalent to F4
Compressive strength, tensile strength than 4

(120℃

Corrosive liquid acid salt

plastic

Polyethylene

PO

Resistant to acid; alkali; salt corrosion

(60℃

Sewage liquid acid salt

PPS

PPS

Resistant to acid; alkali; salt corrosion

(100℃

Sewage liquid acid salt


2. Selection Help
Defining electrode, grounding ring material: Please refer to Table 5
Table 5

material

Corrosion Resistance

316L

Application: 1. domestic water, industrial water, raw water wells, municipal sewage
2. Weak corrosive acid, alkali, salt solution

Hastelloy B

Application: 1. hydrochloric acid (concentration of less than 10%) and other non-oxidizing acid
2. The alkaline sodium hydroxide solution (concentration less than 50%), all concentrations
3. phosphoric acid, an organic acid
NA: nitric acid

Hastelloy C

Application: 1. mixed solution of mixed acid and chromic acid and sulfuric acid
2. oxidizing salts such as Fe +++, Cu ++, sea
3. phosphoric acid, an organic acid
NA: hydrochloric acid

Titanium (Ti)

Application: 1. salts, such as: ⑴ chloride (chloride / magnesium / aluminum / calcium / ammonium / iron, etc.)
⑵ sodium; potassium; ammonium salts; secondary aluminate; seawater
2. The concentration is less than 50% of potassium hydroxide, ammonium hydroxide, barium hydroxide alkaline solution
NA: hydrochloric acid; sulfuric acid; phosphoric acid; hydrofluoric acid reduction

Tantalum (Da)

Application: 1. hydrochloric acid (concentration of less than 40%), sulfuric acid and concentrated sulfuric acid (not including oleum)
2. chlorine dioxide, ferric chloride, hypochlorous acid, sodium cyanide, acetic acid, etc.
3. nitric acid (including fuming nitric acid), and other oxidizing acid, the temperature is below 80 ℃ in aqua regia
NA: alkali, hydrofluoric acid

Platinum (Pt)

Application: Almost all of the acid; alkali; salt solutions (including fuming sulfuric acid, fuming nitric acid)
NA: aqua regia, ammonium salt

carbide

Application: pulp; sewage; resistant to solid particles interference
NA: inorganic acid; organic acids; chlorides


If you can not determine the choice of lining materials and electrode materials which refer to Part VII 'List of electrode and lining material corrosion resistant'

Third, the installation dimensions
1. Flowmeter Dimensions
figure 1


Table 6

(TD cla

DN

a

D

Do

n * A

10

230

90

60

4*14

15

230

95

65

4*14

20

230

105

75

4*14

25

230

115

85

4*14

32

230

140

100

4*18

40

230

150

110

4*18

50

230

165

125

4*18

65

230

185

145

4*18

80

230

200

160

8*18

100

230

220

180

8*18

125

280

250

210

8*18

150

280

285

240

8*22

200

310

340

295

8*22

250

360

395

350

12*22

300

460

445

400

12*22

350

460

505

460

16*22

400

460

565

515

16*26

450

460

615

565

20*26

500

600

670

620

20*26

600

600

780

725

20*30

700

700

895

840