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ZRN-LDC series electromagnetic flowmeter
The ZRN-LDC series electromagnetic flowmeter is a fully intelligent electromagnetic flowmeter developed by Ruineng Instrument using advanced domestic
Product details
ZRN-LDC series electromagnetic flowmeter
Zhongrui Energy Instrument adopts advanced domestic and foreign technologies to develop a fully intelligent electromagnetic flowmeter. Its all Chinese electromagnetic converter core adopts a high-speed central processing unit, which has fast calculation speed, high accuracy, and reliable performance. The converter circuit design adopts international advanced technology, with an input impedance of up to 1015 ohms and a common mode rejection ratio better than 100db, which can measure fluid medium flow rates with lower conductivity. The sensor adopts a magnetic circuit structure with non-uniform magnetic field technology, which ensures stable and reliable magnetic field. Our company's consistent goal is to ensure that customers can buy with confidence, use with ease, and receive satisfactory service.
The measurement principle is Faraday's law of electromagnetic induction, and the main components of the sensor are: measuring tube, electrode, excitation coil, iron core, and magnetic yoke housing. It is mainly used to measure the volumetric flow rate of conductive liquids and slurries in closed pipelines. Including highly corrosive liquids such as acids, alkalis, salts, etc. Zhongrui Energy Instrument produces electromagnetic flowmeters and split type electromagnetic flowmeters, which are widely used in industries such as petroleum, chemical, metallurgical, textile, food, pharmaceutical, papermaking, as well as environmental protection, municipal management, and water conservancy construction.
Anatomy image of electromagnetic flowmeter:
Calibration device for company electromagnetic flowmeter
Selection of electromagnetic flowmeter
The selection of instruments is a very important task in instrument applications. Relevant data shows that 2/3 of instrument failures in practical applications are caused by incorrect selection or installation of instruments. Please pay special attention.
The correct selection of electromagnetic flowmeter is a prerequisite for ensuring the good use of electromagnetic flowmeter. The selection of the type of electromagnetic flowmeter should be based on the physical and chemical properties of the measured fluid medium, so that the diameter, flow range, lining material, electrode material, and output current of the electromagnetic flowmeter can adapt to the properties and flow requirements of the measured fluid. Measurable fluids: According to the working principle of electromagnetic flow meters, fluids that can be measured with electromagnetic flow meters must be conductive. Strictly speaking, except for high-temperature fluids, any fluid with a conductivity greater than 5 μ/cm should be measured with the corresponding electromagnetic flow meter. Therefore, non-conductive gases, vapors, oils, acetone, and other substances cannot be measured with electromagnetic flow meters. Determination of sensor diameter: The flow rate of the flowmeter is best within the range of 0.3-15m/s, and the diameter of the flowmeter can be selected to be consistent with the diameter of the user's pipeline. When the flow rate is lower than 0.3m/s, it is best to locally increase the flow rate at the instrument location and use a reduction method: when the central cone angle of the reducer is not greater than 15oC, the reducer can be considered as part of the straight pipe section. Selection of integrated or separated type: Integrated type: In better on-site environments, integrated type is generally chosen, that is, the sensor and converter are assembled into one unit.
Separated type: The sensor and converter are installed separately in different locations, and the separated type is generally selected when the following situations occur. When ordering, the separation distance of the sensor converter should be specified, generally not exceeding 100m, and the converter should be wall mounted.
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316L electrode display #FormatImgID_4# |
Pure copper enameled wire #FormatImgID_5# |
Schematic diagram of tantalum electrode #FormatImgID_6# |
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#FormatImgID_7# Internal Structure Diagram |
#FormatImgID_8# Schematic diagram of PO lining |
#FormatImgID_9# Schematic diagram of PTFE lining |
Technical parameters of electromagnetic flowmeter
Selection of lining:
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Lining material |
Performance |
scope of application |
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chloroprene rubber Neoprene |
Good wear resistance, excellent elasticity, high tensile strength, and resistance to corrosion from low concentration acid-base salt media, but not resistant to corrosion from oxidizing media. |
<80 ° C, general water, sewage, mud, slurry |
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polyurethane Polyurethane |
Has excellent wear resistance, but slightly inferior acid and alkali resistance. |
<60 ° C, neutral and strongly worn mineral slurry, coal slurry, and mud. |
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PTFE PTFE |
The most stable material in terms of chemical properties, capable of withstanding boiling hydrochloric acid, sulfuric acid, nitric acid, aqua regia, concentrated alkali, and various organic solvents, but not resistant to chlorine trifluoride and high-temperature oxygen difluoride. |
<180 ° C, strong corrosive media such as concentrated acid and alkali, sanitary media. |
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F46 |
Chemical stability, electrical insulation, lubricity, non adhesiveness, and non flammability are similar to PTFE, but F46 material has better strength, aging resistance, temperature resistance, and low-temperature flexibility than PTFE. Good adhesion to metal, better wear resistance than PTFE, with good performance |
<180 ° C, hydrochloric acid, sulfuric acid, aqua regia, and strong oxidants, sanitary media |
Selection of electrode materials for electromagnetic flowmeter: 1
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material |
Corrosion Resistance |
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316L |
For nitric acid, sulfuric acid at room temperature<5%, boiling phosphoric acid, alkaline solution; Under certain pressure, media such as sulfurous acid, seawater, and acetic acid have strong corrosion resistance. |
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Hastelloy HB |
Resistant to all concentrations of non oxidizing acids, bases, and non chlorinated hydrochloric acids such as hydrochloric acid, sulfuric acid, hydrofluoric acid, and organic acids at boiling point. |
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Hastelloy HC |
Resistant to oxidizing acids such as nitric acid, mixed acids, or mixtures of chromic acid and sulfuric acid, as well as oxidizing salts and seawater |
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titanium |
It can withstand corrosion from seawater, various chlorides and hypochlorites, oxidizing acids (including fuming nitric acid), organic acids, alkalis, etc. It is not resistant to corrosion from relatively pure reducing acids (sulfuric acid, hydrochloric acid), but corrosion is greatly reduced when the acid contains oxidants (such as nitric acid and media containing Fe and Cu ions). |
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tantalum |
It has excellent corrosion resistance similar to glass, except for hydrofluoric acid and concentrated sulfuric acid, and can withstand corrosion from almost all chemical media (including boiling point hydrochloric acid, nitric acid, and sulfuric acid below 175 ° C). It is not resistant to corrosion in alkali. |
Selection of Electromagnetic Flow Measurement Caliber and Flow Rate
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Nominal diameter (mm) |
Measurable flow range (m3/h) |
Effective measurement flow range (m3/h) |
Nominal diameter (mm) |
Measurable flow range (m3/h) |
Effective measurement flow range (m3/h) |
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10 |
0.0142～3.3912 | 0.0848～2.826 |
300 |
12.717～3052 | 76.302～2543 |
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15 |
0.0318～7.6302 | 0.1908～6.3585 |
350 |
17.31～4154 | 103.86～3461 |
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20 |
0.0566～13.5648 | 0.3392～11.304 |
400 |
22.61～5425 | 135.65～4521 |
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25 |
0.0883～21.195 | 0.5298～17.6625 |
450 |
28.62～6867 | 171.68～5722 |
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32 |
0.1447～34.7258 | 0.8682～29.9382 |
500 |
35.33～8478 | 211.95～7065 |
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40 |
0.2261～54.2592 | 1.3565～45.216 |
600 |
50.87～12208 | 305.2～10173 |
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50 |
0.3533～84.78 | 2.1195～70.65 |
700 |
69.24～16616 | 415.4～13847 |
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65 |
0.5970～143.28 | 3.5819～119.39 |
800 |
90.44～21703 | 542.6～18086 |
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80 |
0.9044～217.03 | 5.4259～180.86 |
900 |
114.46～27468 | 686.7～22890 |
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100 |
1.413 ～339.12 | 8.478～282.6 |
1000 |
141.3～33912 | 847.8～28260 |
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125 |
2.2079～529.87 | 13.2468～441.56 |
1200 |
203.5～48833 | 1221~40694 |
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150 |
3.1793～763 | 19.0755～635.85 |
1400 |
277~66467 | 1662~55389 |
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200 |
5.652～1356 | 33.912～1130.4 |
1600 |
361.8～86814 | 2171~72345 |
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250 |
8.8313～2119 | 52.9875～1766 |
1800 |
457.9～109874 | 2747~91562 |
The measuring pipeline must be completely filled with liquid;
Technical parameters of electromagnetic flowmeter
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Nominal diameter (mm) (Special specifications can be customized) |
Pipeline type PTFE lining: DN10~DN1200 |
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Pipeline rubber lining: DN40~DN1200 |
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Flow direction: |
Positive, negative, net traffic |
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Range ratio: |
150：1 |
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Repetitive error: |
± 0.1% of the measured value |
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Accuracy level: |
Pipeline type: 0.2-0.5% grade |
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Temperature of the tested medium: |
Ordinary rubber lining: -20 to+60 ℃ |
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High temperature rubber lining: -20 to+90 ℃ |
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PTFE lining: -30 to+100 ℃ |
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High temperature PTFE lining: -20 to+180 ℃ |
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Rated working pressure: (High voltage can be customized) |
DN6－DN80：≤1.6MPa |
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DN100－DN250：≤1.0MPa |
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DN300－DN1200：≤0.6MPa |
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Flow rate range: |
0.1－15m/s |
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Conductivity range: |
The conductivity of the measured fluid is ≥ 5 μ s/cm |
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Current output: |
load resistance |
0～10mA：0～1.5kΩ |
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4～20mA：0～750 kΩ |
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Digital frequency output: |
The upper limit of the output frequency can be set within 1-5000Hz with a transistor collector open circuit bidirectional output with photoelectric isolation. When the external power supply is ≤ 35V and conducting, the maximum collector current is 250mA |
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Power supply: |
AC220V, DC24V or 3.6V batteries |
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Require the length of the straight pipe section |
Upstream ≥ 5DN, downstream ≥ 2DN |
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Connection method: |
The flowmeter and piping are connected by flanges, and the flange connection size should comply with the provisions of GB11988 |
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Explosion proof grade: |
mdIIBT4 |
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Protection level: |
IP65， Specially customized up to IP68 |
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Environmental temperature: |
－25～＋60℃ |
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Relative temperature: |
5%～95% |
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Total power consumption: |
Less than 20W |
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Instrument selection 1. Selection code:
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model |
describe |
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ZRN-DC — |
□ |
□ |
-□ |
□ |
□ |
□ |
□ |
□ |
-□ |
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orifice |
10-2200mm |
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combination |
S |
All-In-One |
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L |
Split type |
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Electrode material |
M |
stainless steel |
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T |
Ti (titanium) |
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D |
Ta (tantalum) |
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H |
Hastelloy alloy |
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P |
Pt platinum |
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N |
Ni nickel |
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Output |
0 |
no-output |
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1 |
4-20mA/1-5KHz |
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2 |
4-20mA |
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Lining material |
X |
rubber |
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F |
PTFE |
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P |
polyethylene |
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J |
polyurethane |
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local display |
0 |
No on-site display |
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1 |
local display |
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Communication method |
0 |
No communication |
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1 |
RS485 |
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2 |
RS232 |
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3 |
Mobdus |
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4 |
Hart |
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grounding |
0 |
No grounding ring |
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1 |
There is a grounding ring |
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2 |
There is a grounding electrode |
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Maximum traffic limit |
（n） |
Upper limit flow rate (range) m3/h
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