 
|
|
The measurement principle of electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. The measuring tube of the flowmeter is a non-magnetic alloy short tube lined with insulating material. Two electrodes are fixed on the measuring tube by passing through the tube wall along the diameter direction. The electrode tip is basically flush with the inner surface of the lining. When the excitation coil is excited by bidirectional square wave pulses, a working magnetic field with a magnetic flux density of B will be generated in the direction perpendicular to the axis of the measuring tube. At this point, if a fluid with a certain conductivity flows through the measuring tube, it will cut the magnetic field lines and induce an electromotive force E. The electromotive force E is proportional to the product of the magnetic flux density B, the inner diameter d of the measuring tube, and the average flow velocity V. The electromotive force E (flow signal) is detected by the electrode and sent to the converter through a cable. After amplifying and processing the flow signal, the converter can display the fluid flow rate and output signals such as pulses and simulated currents for flow control and regulation.
|
|
|
| |
 |
| 1. High measurement accuracy, stable and reliable application, and excellent performance. |
| 2. The measurement accuracy is not affected by changes in parameters such as fluid viscosity, density, pressure, and fluid distribution |
| 3. The measuring tube has no resistance components, no pressure loss, and is not affected by poor water quality |
| 4. Multiple lining options and electrode choices |
| 5. Wide measurement flow range |
| 6. Large screen LCD backlit display, with clear readings in both strong and low light conditions |
| 7. The language can display both Chinese and English |
| 8. The LCD screen displays instantaneous flow rate, instantaneous heat, cumulative flow rate, cumulative heat, inlet temperature, outlet temperature, temperature difference, and flow rate |
| 9. Adopting the enthalpy correction method with temperature changes to ensure accurate measurement at different water temperatures |
| 10. Equipped with RS485, Modbus, and HART communication |
| 11. Automatic data storage |
| 12.220V AC, 24V DC power supply |
| |
|
 |
| name |
HHDR Intelligent Electromagnetic Heat Meter |
| Nominal Diameter |
DN10-DN400 |
| structural style |
One body type, split body type |
| Maximum flow velocity |
15m／s |
| Fluid conductivity |
≥5uS／cm |
| accuracy class |
Level 0.5, Level 1.0 (differentiated by caliber) |
| Lining material |
Polytetrafluoroethylene, chloroprene rubber, polyvinyl chloride, perfluoroalkoxy (F46) |
| Rated pressure |
4.0Mpa, 1.6Mpa, 1.0Mpa |
| Maximum fluid temperature |
All-In-One |
70℃ |
| separated |
PTFE lining |
100℃； 150 ℃ (special order required) |
| Chloroprene rubber lining |
80℃； 120 ℃ (special order required) |
| Polycarbonate lining |
80℃ |
| Perfluoroethylene propylene (F46) |
100℃； 150 ℃ (special order required) |
| Signal electrode and ground electrode materials |
316L, Hastelloy B, Hastelloy C |
| Sensor material |
Carbon steel, 304 stainless steel |
| Shell protection |
IP65, IP68 (special customization required) |
| output signal |
Pulse, frequency |
| cable interface |
G1/2 internal thread |
| communication |
RS485 communication (Modbus protocol) HART |
| Display on monitor |
Instantaneous flow rate, instantaneous heat, cumulative flow rate, cumulative heat, flow rate, inlet temperature, outlet temperature, temperature difference |
| power supply |
220V AC 50HZ, 24V DC |
| Excitation method |
Bidirectional constant current square wave excitation |
|
| measuring range |
Caliber (mm) |
Measurement range (m 3/h) |
Caliber (mm) |
Measurement range (m 3/h) |
| DN10 |
0.14 ～ 1.40 |
DN125 |
22.08～ 441.56 |
| DN15 |
0.32 ～ 6.36 |
DN150 |
31.79～ 635.85 |
| DN20 |
0.57～ 11.30 |
DN200 |
56.52 ～ 1130.4 |
| DN25 |
0.88～ 17.66 |
DN250 |
88.31 ～ 1766.25 |
| DN32 |
1.45～ 28.94 |
DN300 |
127.17～ 2543.40 |
| DN40 |
2.26～ 45.22 |
DN350 |
173.09～ 3461.85 |
| DN50 |
3.35～ 70.65 |
DN400 |
226.08～ 4521.60 |
| DN65 |
5.97～ 119.40 |
|
|
| DN80 |
9.04～ 180.86 |
|
|
| DN100 |
14.13 ～ 282.60 |
|
|
|
 |
|
|
| Nominal diameter DN |
pressure rating |
Outer diameter of flange D |
Bolt hole center circle diameter K |
Bolt hole n-L |
Total length L |
Height H |
Reference weight kg |
| 10 |
PN40 |
90 |
60 |
4-φ14 |
200 |
190 |
10 |
| 15 |
PN40 |
95 |
65 |
4-φ14 |
200 |
190 |
10 |
| 20 |
PN40 |
105 |
75 |
4-φ14 |
200 |
190 |
10 |
| 25 |
PN40 |
110 |
85 |
4-φ14 |
200 |
200 |
10 |
| 32 |
PN40 |
140 |
100 |
4-φ18 |
200 |
205 |
11 |
| 40 |
PN40 |
150 |
110 |
4-φ18 |
200 |
215 |
12 |
| 50 |
PN40 |
165 |
125 |
4-φ18 |
200 |
220 |
15 |
| 65 |
PN16 |
185 |
145 |
4-φ18 |
200 |
240 |
16 |
| 80 |
PN16 |
200 |
160 |
8-φ18 |
200 |
255 |
18 |
| 100 |
PN16 |
220 |
180 |
8-φ18 |
250 |
270 |
20 |
| 125 |
PN16 |
250 |
210 |
8-φ18 |
250 |
300 |
25 |
| 150 |
PN16 |
285 |
240 |
8-φ22 |
300 |
330 |
30 |
| 200 |
PN16 |
340 |
295 |
12-φ24 |
350 |
390 |
45 |
| 250 |
PN16 |
405 |
355 |
12-φ26 |
450 |
450 |
65 |
| 300 |
PN16 |
460 |
410 |
12-φ28 |
500 |
500 |
79 |
| 350 |
PN16 |
520 |
470 |
16-φ30 |
550 |
520 |
95 |
| 400 |
PN16 |
580 |
525 |
16-φ32 |
600 |
635 |
140 |
|
 |
 
|
 |
|
1. Installation requirements
General requirements
a. For the convenience of installation, maintenance, and upkeep, sufficient space should be reserved around the flowmeter
b. Avoid installing flow meters in places with large temperature changes or high temperature radiation from equipment
c. Flow meters should be installed indoors. If installed outdoors, direct sunlight should be avoided and sun protection devices should be installed if necessary
d. Avoid installing flow meters in environments containing corrosive gases
e. Avoid installing flow meters in places with strong vibration sources and magnetic fields
Process management requirements
a. The inner diameter of the upstream and downstream process pipes and the inner diameter of the flow meter should meet the following requirements: 0.98DN ≤ D ≤ 1.05DN (DN: flow meter inner diameter; D： Inner diameter of process pipe
b. The process pipe and flow meter should be concentric, with a coaxial deviation of no more than 0.05DN
|
|
|
|
 |
 |
 |
 |
 |
 |
| Fault name |
solution |
| Converter has no display |
1. Check if the power supply is connected. 2. Check if the fuse is intact. 3. Check if the power supply voltage meets the requirements. 4. If all three items are normal, the converter will be returned to the factory for repair |
| Excitation alarm |
1. The insulation degree of the excitation coil decreases |
| Air traffic control alarm |
1. Is the measured fluid filled in the tube? 2. Is the flowmeter installed correctly as required? 3. The conductivity of the measured fluid is too low. 4. The threshold value of the empty tube is set too low |
| Display traffic when there is no traffic |
1. The air traffic control threshold is set too high. 2. The air traffic control alarm is not allowed to be turned on. 3. The electrode is contaminated, causing zero point deviation (when the pipeline is full). 4. The insulation degree of the signal line decreases (when the pipeline is full) |
| Flow measurement is inaccurate or fluctuates greatly |
1. Is the fluid filled in the pipe? 2. Is the flowmeter grounded according to regulations? 3. Has the insulation degree of the signal line decreased? 4. Is the flowmeter installed correctly as required |
| Traffic limit alarm |
1. If the on-site traffic exceeds the traffic limit threshold, modify the traffic limit threshold |
| Flow lower limit alarm |
1. If the on-site traffic is below the lower limit threshold, modify the lower limit threshold of the traffic |
| No traffic display when there is traffic |
1. Is the shut-off valve open? 2. Is the signal line grounded? 3. The flow rate is too low, and the small signal cutoff setting is too high. 4. The air pipe threshold is set too low |
|
|
|
|
1. Grounding wire (standard)
2. Grounding ring (optional)
3. Paired flange (flange size table)
|
 |
|
| The nominal Tongjing |
Outer diameter (D) |
Inner diameter (B) |
Center distance (K) |
Bolt hole diameter (L) |
Number of bolt holes (n) |
Sealing surface (d) |
flange thickness |
| 15（4.0） |
95 |
19 |
65 |
14 |
4 |
46 |
14 |
| 20（4.0） |
105 |
26 |
75 |
14 |
4 |
56 |
16 |
| 25（4.0） |
115 |
33 |
85 |
14 |
4 |
65 |
16 |
| 32（4.0） |
140 |
39 |
100 |
18 |
4 |
76 |
18 |
| 40（4.0） |
150 |
46 |
110 |
18 |
4 |
84 |
18 |
| 50 (4.0） |
165 |
59 |
125 |
18 |
4 |
99 |
20 |
| 65（1.6） |
185 |
78 |
145 |
18 |
4 |
118 |
20 |
| 80（1.6） |
200 |
91 |
160 |
18 |
8 |
132 |
20 |
| 100（1.6） |
220 |
110 |
180 |
18 |
8 |
156 |
22 |
| 125（1.6） |
250 |
135 |
210 |
18 |
8 |
184 |
22 |
| 150（1.6） |
285 |
161 |
240 |
22 |
8 |
211 |
24 |
| 200（1.6） |
340 |
222 |
295 |
22 |
12 |
266 |
26 |
| 250（1.6） |
405 |
276 |
355 |
26 |
12 |
319 |
28 |
| 300（1.6） |
460 |
328 |
410 |
26 |
12 |
370 |
32 |
| 350（1.6） |
520 |
381 |
470 |
26 |
16 |
429 |
35 |
| 400（1.6） |
580 |
430 |
525 |
30 |
16 |
480 |
38 |
| 450（1.0） |
615 |
485 |
565 |
26 |
20 |
530 |
35 |
| 500（1.0） |
670 |
535 |
620 |
26 |
20 |
582 |
38 |
| 600（1.0） |
780 |
636 |
725 |
30 |
20 |
682 |
42 |
| 700（0.6） |
860 |
724 |
810 |
26 |
24 |
772 |
40 |
| 800（0.6） |
975 |
824 |
920 |
30 |
24 |
878 |
44 |
| 900（0.6） |
1075 |
924 |
1020 |
30 |
24 |
978 |
48 |
| 1000（0.6） |
1175 |
1024 |
1120 |
30 |
28 |
1078 |
52 |
| 1200（0.6） |
1405 |
1224 |
1340 |
33 |
32 |
1295 |
60 |
| 1400（0.6） |
1630 |
1424 |
1560 |
36 |
36 |
1510 |
68 |
| 1600（0.6） |
1830 |
1624 |
1760 |
36 |
40 |
1710 |
76 |
| 1800（0.6） |
2045 |
1824 |
1970 |
39 |
44 |
1918 |
84 |
|
 |
|
|
 |
 |
 
|
 |
 |
 |
| |
| |
| |
| |
| |
