electromagnetic flowmeter
An electromagnetic flowmeter is composed of two parts- electromagnetic flow sensor and electromagnetic flow transducer.
The operation of an electromagnetic flowmeter is based on Faraday law ofelectromagnetic induction.The mainly parts of the sensor are: measuring tube、electrode poles、excitation coil、iron core、yoke and housing. The measuringtube of the sensor is a short alloy tube whose diameter is D, the inner sufaceof it has an insulating liner.Two electrodes are fixed in the measuring tubealong with the diameter direction of it and they usually flush with the inner surfaceliner.When excitation coil pulsed by two-way square wave,there generatesa working magnetic field with a flux density B in the vertical direction ofthemeasurement axis.In the meantime,if some electrical conductivity liquidflows at an average velocity V through the measuring tube ,cuts lines of themagnetic field,there generates induced electromotive force E.Electromotiveforce E is directly proportional to the product of flux density B、measuring tubediameter D and average velocity V,that's: E BVD. Electromotive force E(flowsignal) is measured by the electrodes and transmitted to transducer throughcable.After the transducer handles the flow signal by magnifying it, the flowand total amount can be displayed,also will output pulse and current etc. The transducer of RXLDBE type electromagnetic flowmeter has an intelligentindicator suggesting Chinese characters LCD display.
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Standard |
JB/T9248-1999 |
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Nominal diameter |
3、6、10、15、20、25、32、40、50、65、80、100、125、150、200、250、300、350、400、450、500、600、700、800、900、1000、1200、1400、1600、1800、2000、2200、2400、2600、2800、3000 |
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Maximum flowrate |
15m/s |
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Accuracy class |
Indication result±0.5%(Flowrate0.8m/s);±4mm/s(Flowrate＜0.8m/s) |
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Fluid conductivity |
≥5μS/cm |
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Nominal pressure |
4.0 MPa |
1.6 MPa |
1.0 MPa |
0.6 MPa |
6.3、10 MPa etc |
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DN3～DN150 |
DN15～DN600 |
DN200～DN1000 |
DN700～DN3000 |
Special order |
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Lining material |
Polytetrafluoroethylene、Neoprene、Polyurethane、Fluororesin-46(F46)、PFA with stainless steel net |
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Ambient temperature |
Sensor |
-25℃～+60℃ |
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Transducer and integrated type |
-10℃～+60℃ |
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Maximum Fluid temperature |
Integrated type |
70℃ |
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Divided type |
Neoprene lining |
80℃;120℃(Note it in the order) |
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Polyurethane rubber lining |
80℃ |
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Polytetrafluoroethylene lining |
100℃;150℃(Note it in the order) |
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Fluororesin-46(F46) |
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PFA with stainless steel net |
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Material of signal electrode and ground electrode |
Stainless steel0Cr18Ni12Mo2Ti、Hastelloy C、Hastelloy B、Titanium、Tantalum、 Platinum/Iridium alloy、Stainless steel coating with tungsten carbide |
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Electrode drawknife apparatus |
DN80～DN3000 |
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Connection flange material |
Carbon steel |
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Connection ring material |
Stainless steel1Cr18Ni9Ti |
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Housing protection |
DN15～DN3000 divided type rubber or polyurethane lining sensor |
IP65 or IP68 |
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Integrated type(round transducer ) |
IP67 |
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Other sensors and divided type transducers |
IP65 |
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Sign of explosionproof instrument |
Ex dmⅡCT4 |
Only integrated type、IP65、magnetic flux linkage、DN15～DN600 |
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Distance(divided type) |
The distance from transducer to sensor usually whinthin 100m,over 100m should make a special order |
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a.Connection form A.Flanged connection B.Gripping type |
f. Housing protection 1.IP65 2.IP68+IP65(SensorIP68+TransducerIP65)(Code c can only choose 2,3;Code f can only choose 0;Code h can only choose CR;Code j can only choose 01～06) 3.IP67(Code c can only choose 2,3;Code f can only choose 0;Code h can only choose CH;Code j can only choose 07～10). |
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b Nominal diameter(mm) Code Bore Code Bore Code Bore 015 15 250 250 10A 1000 020 20 300 300 12A 1200 025 25 350 350 14A 1400 040 40 400 400 16A 1600 050 50 450 450 18A 1800 065 65 500 500 20A 2000 100 100 600 600 22A 2200 150 150 700 700 24A 2400 200 200 800 800 26A 2600 900 900 28A 2800 30A 3000
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g. Explosion-proof sign 0 Nil 1 ExdmⅡCT4(DN15～DN600)；e can only choose 1 |
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h. Attachments 0 Nil 1 Ground electrode(DN25～DN3000) 2 Ground ring(DN15～DN3000) 3 Electrode drawknife apparatus(DN80～DN3000) |
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C. Nominal pressure(MPa） 06 0.6 (DN700-DN3000) 10 1.0 (DN15-DN10000) 16 1.6 (DN15-DN600) 40 4.0 (DN15-DN150) xx Special order |
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i. Structure CR Divided type CH Integrated type |
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j. Power supply 1 85～265V 45～400Hz 2 16～40V D.C. |
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d. Lining material 1.Polytetrafluoroethylene(F4) (DN15～DN1000) 2.Neoprene (DN50～DN3000) 3.Polyurethane (DN15～DN600) 4.Fluororesin-46(F46) (DN15～DN250) 5.PFA with stainless steel net (DN50～DN250) |
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k. Transducer type 1.Square divided type、Key、Single electricity、_Double pulse、Two circuits alarm 2..Ball integrated type、Key、Single electricity、Monopulse、Two circuits alarm 3. Ball integrated type、Magnetic flux linkage、Single electricity、Monopulse、Two circuits alarm 4. Square divided type、Magnetic flux linkage、Single electricity、Double pulse、Two circuits alarm Note: 1. Communication Protocol: RS232, RS485, Hart optional 2. The batch control function is optional 3. GPRS remote monitoring function optional
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e. Electrode material 1.Stainless steel0Cr18Ni12Mo2Ti 2.Hastelloy B 3.Hastelloy C 4.Titanium 5.Platinum/Iridium alloy 6.Tantalu |
DN15-DN150 profile、 dimensions and weight DN15-DN150DN15-DN150 flange dimensions(Standard:GB/T9119)
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Nominal diameter (DN) |
L |
H1 x W |
H2 |
Weight for reference(Kg) |
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Nominal diameter (DN) |
Pressure1.6MPa |
Pressure4.0MPa |
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Integrated type |
Sensor |
D |
d1 |
d0 |
n |
b |
D |
d1 |
d0 |
n |
b |
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15 |
200 |
174X140 |
112 |
10 |
7 |
15 |
95 |
65 |
14 |
4 |
16 |
95 |
65 |
14 |
4 |
16 |
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20 |
200 |
174X140 |
112 |
12 |
9 |
20 |
105 |
75 |
14 |
4 |
18 |
105 |
75 |
14 |
4 |
18 |
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25 |
200 |
174X140 |
116 |
14 |
11 |
25 |
115 |
85 |
14 |
4 |
18 |
115 |
85 |
14 |
4 |
18 |
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32 |
200 |
210X168 |
116 |
15 |
12 |
32 |
140 |
100 |
18 |
4 |
18 |
140 |
100 |
18 |
4 |
18 |
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40 |
200 |
210X176 |
142 |
16 |
13 |
40 |
150 |
110 |
18 |
4 |
20 |
150 |
110 |
18 |
4 |
20 |
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50 |
200 |
210X176 |
144 |
17 |
14 |
50 |
165 |
125 |
18 |
4 |
20 |
165 |
125 |
18 |
4 |
20 |
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65 |
200 |
250X214 |
157 |
25 |
22 |
65 |
185 |
145 |
18 |
4 |
20 |
185 |
145 |
18 |
8 |
22 |
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80 |
200 |
250X214 |
175 |
29 |
26 |
80 |
200 |
160 |
18 |
8 |
20 |
200 |
160 |
18 |
8 |
24 |
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100 |
250 |
312×230 |
200 |
31 |
28 |
100 |
220 |
180 |
18 |
8 |
22 |
235 |
190 |
22 |
8 |
26 |
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125 |
250 |
370×281 |
226 |
36 |
33 |
125 |
250 |
210 |
18 |
8 |
22 |
270 |
220 |
26 |
8 |
26 |
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150 |
300 |
370×281 |
254 |
41 |
38 |
150 |
285 |
240 |
22 |
8 |
24 |
300 |
250 |
26 |
8 |
28 |
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DN200-DN600 profile~dimensions and weight DN200-DN600 flange dimensions
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Nominal diameter (DN) |
L |
H |
Weight forreference (Kg) |
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GB/T9119 |
Nominal diameter (DN) |
Pressure 1.6 MPa |
Pressure 1.0 MPa |
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D |
d1 |
d0 |
n |
b |
D |
d1 |
d0 |
n |
b |
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200 |
350 |
Ø310 |
45 |
200 |
340 |
295 |
22 |
12 |
26 |
340 |
295 |
22 |
8 |
24 |
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250 |
450 |
Ø358 |
50 |
250 |
405 |
355 |
26 |
12 |
28 |
395 |
350 |
22 |
12 |
26 |
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300 |
500 |
Ø410 |
60 |
300 |
460 |
410 |
26 |
12 |
32 |
445 |
400 |
22 |
12 |
28 |
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350 |
550 |
Ø465 |
145 |
350 |
520 |
470 |
26 |
16 |
35 |
505 |
460 |
22 |
16 |
30 |
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400 |
600 |
Ø515 |
180 |
400 |
580 |
525 |
30 |
16 |
38 |
565 |
515 |
26 |
16 |
32 |
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450 |
600 |
Ø564 |
215 |
450 |
640 |
585 |
30 |
20 |
42 |
615 |
565 |
26 |
20 |
35 |
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500 |
600 |
Ø614 |
245 |
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500 |
715 |
650 |
33 |
20 |
46 |
670 |
620 |
26 |
20 |
38 |
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600 |
600 |
Ø722 |
335 |
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600 |
840 |
770 |
36 |
20 |
52 |
780 |
725 |
30 |
20 |
42 |
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DN700-DN3000 profile、 dimensions and weight DN700-DN3000 flange dimensions
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Nominal diameter (DN) |
L |
H |
Weight forreference (Kg) |
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Nominal diameter (DN) |
PressureMPa |
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D |
d1 |
d0 |
n |
b |
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700 |
700 |
Ø836 |
435 |
700 |
1.0 |
895 |
840 |
30 |
24 |
30 |
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800 |
800 |
Ø936 |
545 |
800 |
1015 |
950 |
33 |
24 |
32 |
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900 |
900 |
Ø1036 |
655 |
900 |
1115 |
1050 |
33 |
28 |
34 |
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1000 |
1000 |
Ø1136 |
810 |
1000 |
1230 |
1160 |
36 |
28 |
34 |
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1200 |
1200 |
Ø1336 |
875 |
700 |
0.6 |
860 |
810 |
26 |
24 |
26 |
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1400 |
1400 |
Ø1536 |
1235 |
800 |
975 |
920 |
30 |
24 |
26 |
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1600 |
1600 |
Ø1736 |
1555 |
900 |
1075 |
1020 |
30 |
24 |
26 |
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1800 |
1800 |
Ø1960 |
2085 |
1000 |
1175 |
1120 |
30 |
28 |
26 |
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2000 |
2000 |
Ø2160 |
2610 |
1200 |
1405 |
1340 |
33 |
32 |
28 |
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2200 |
2200 |
Ø2364 |
3210 |
1400 |
1630 |
1560 |
36 |
36 |
32 |
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2400 |
2400 |
Ø2564 |
3910 |
1600 |
1830 |
1760 |
36 |
40 |
34 |
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2600 |
2600 |
Ø2764 |
4280 |
1800 |
2045 |
1970 |
39 |
44 |
36 |
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2800 |
2800 |
Ø2960 |
5000 |
2000 |
2265 |
2180 |
42 |
48 |
38 |
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3000 |
3000 |
Ø3160 |
5600 |
2200 |
2475 |
2390 |
42 |
52 |
42 |
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2400 |
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2685 |
2600 |
42 |
56 |
44 |
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2600 |
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2905 |
2810 |
48 |
60 |
46 |
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2800 |
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3115 |
3020 |
48 |
64 |
48 |
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3000 |
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3315 |
3220 |
48 |
68 |
50 |
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| Correct hoisting | To ensure the length ofthe straight pipe | When installed vertically,flowing from the bottom to top |
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| The installation position should be convenient for reading and operating |
Relative position of two electrodes is basically on the level |
When installed vertically, flowing from the bottom to top |
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| Reasonable support,the sensor cannot be used as load point |
Centring the shims to avoid vortex | Far away from flame |
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| When discharging,should avoid the impac of bubbles and negative pressure |
To avoid negative pressure,the flowmeter can't be installed on the suction side of the pump |
When the head is over 5m,should install an automatic exhaust valve at the downstream high position of the meter to prevent negative pressure difference damaging the lining |
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| To prevent leakage | To avoid large temperature difference | To avoid strong vibration | To avoid solarization |
