Solidat MagFlow Slurry Type Electromagnetic Flowmeter Characteristics and Applications

 

Abstract​
The SLDF7200 series MagFlow Slurry Electromagnetic Flowmeter is a high-precision flow measurement instrument specifically designed by Israel Solid Applied Technologies Co. Ltd. for highly abrasive and corrosive slurry media. Operating based on Faraday's law of electromagnetic induction, it incorporates unique wear-resistant linings, high-frequency excitation technology, and an external plug-in electrode structure, effectively addressing common technical challenges in slurry measurement such as wear, clogging, and measurement inaccuracy. This document details its working principle, technical features, specifications, and field applications, aiming to demonstrate its stable and reliable metering performance in mining processes.

Keywords​
Electromagnetic Flowmeter; Slurry Measurement; Wear-resistant Lining; High-frequency Excitation; SLDF7200; SolidAT

1. Overview​
The SLDF7200 series MagFlow Slurry Electromagnetic Flowmeter is a professional device developed for measuring complex fluids like various slurries, pulp, and coal water slurry in industries such as mining, metallurgy, and coal. Slurry media often contain a large amount of solid particles, exhibiting strong abrasiveness, tendency to settle, and corrosiveness, which impose extremely high requirements on the flowmeter's durability and measurement accuracy. Through comprehensive innovation in material science, structural design, and signal processing technology, the SLDF7200 series offers outstanding wear resistance, anti-clogging capability, and measurement repeatability, ensuring long-term stable operation and accurate measurement under harsh conditions.

2. Working Principle​
The working principle of the SLDF7200 electromagnetic flowmeter is based on Faraday's law of electromagnetic induction.
Its core workflow is as follows:

1)​Generating Magnetic Field:The two electromagnetic coils inside the flowmeter body generate a stable or alternating magnetic field when energized.

2)Inducing Electromotive Force (EMF):When conductive slurry media flows through this magnetic field, it acts like a conductor cutting magnetic flux lines, thereby inducing an electromotive force (voltage signal) on the electrodes located on both sides of the pipe wall, perpendicular to both the fluid flow direction and the magnetic field direction.

3)Signal Calculation:The magnitude of this induced EMF (E) is proportional to the average flow velocity of the slurry (V), the magnetic flux density (B), and the internal diameter of the measuring tube (D), i.e., E = k B D V (where k is a constant). By measuring the EMF signal detected by the electrodes and performing precise calculations in the converter, the instantaneous flow rate and totalized flow of the slurry can be obtained.

3. Technical Features & Advantages​
The core features of the SLDF7200 series slurry flowmeter are reflected in its targeted design:

Excellent Wear & Corrosion Resistance:​​

1)Dedicated Wear-resistant Lining: Offers various high-performance lining options, such as Polyurethane Rubber (PU), Polytetrafluoroethylene (PTFE), etc., providing extremely high resistance to abrasion and corrosion, significantly extending the instrument's service life.

2)Multiple Electrode Materials:Optional materials include 316L, Hastelloy, Titanium, Tantalum, Tungsten Carbide, etc., to adapt to slurries with different chemical properties, ensuring long-term electrode stability.

Accurate and Stable Measurement Performance:​​

1)High-frequency Excitation Technology: Employs a unique high-frequency excitation method, effectively overcoming slurry noise generated by solid particles in the slurry, providing excellent measurement repeatability and linearity, and maintaining high accuracy even at low flow velocities.

2)No Obstruction Design:The inner wall of the measuring tube is smooth, without any moving or protruding parts, resulting in minimal pressure loss and fundamentally avoiding slurry clogging issues.

Robust and Durable Structural Design:​​

 

1)External Plug-in Electrode Structure:The electrodes are designed for wear resistance and are easy to maintain and replace, reducing long-term maintenance costs.

2)High Protection Rating:Provides IP67 or IP68 protection, capable of adapting to humid, dusty mining environments, and can even withstand temporary submersion.

3)Wide Pressure and Size Range:Covers various international standard pressure ratings from GB PN2.5 to PN160, as well as ANSI, DIN, JIS, etc. Size range from DN6 to DN3000, meeting various pipeline installation requirements.

Convenient Operation & Flexible Integration:​​

1)Professional Slurry Converter:The operation interface is simple and clear, facilitating parameter setting.

2)Multiple Output & Communication Options: Supports 4-20mA current output, frequency output, RS-485 (supports Modbus protocol), easily integrating into industrial automation systems like DCS and PLC.

3)Diverse Power Supply Options:Supports 220V AC, 24V DC, and solar power with battery backup, especially suitable for remote mining areas or sites without stable mains power.

​4. Technical Specifications​

Item	Specification Description
​Product Model​	SLDF7200
Measurement Accuracy​	​Full-bore type:​​ Flow velocity ≥ 0.5m/s: ±0.5% of reading (optional ±0.3%R); Flow velocity < 0.5m/s: ±2.5mm/s (optional ±1.5mm/s). ​Insertion type:​​ Flow velocity ≥ 0.5m/s: ±2.5% of reading; Flow velocity < 0.5m/s: ±12.5mm/s.
​Pressure Rating​	Covers various standards including GB, ANSI, DIN, JIS, etc., up to GB PN160 / ANSI CLASS 2500 max. Special pressure ratings can be customized.
​Size Range​	​Full-bore type:​​ DN6 ~ DN3000. ​Insertion type:​​ DN250 ~ DN2600. ​Sanitary type:​​ DN15 ~ DN150.
​Main Materials​	​Electrodes:​​ 316L, Platinum, Hastelloy, Tantalum, Titanium, Tungsten Carbide, etc. ​Lining:​​ Neoprene, Natural Rubber, Polyurethane Rubber, PTFE, FEP, PFA, etc. ​Body/Flange:​​ Carbon Steel (standard), Stainless Steel (optional).
​Power Supply​	220V AC / 24V DC / Solar with Battery
Output Signal​	4-20mA, Frequency, RS-485 (Custom or Modbus protocol)
Protection Rating​	IP67, IP68
Ambient Temperature​	-25℃ ~ +60℃
Electrical Interface​	M20 x 1.5

​5. Field Applications​
The SLDF7200 Slurry Electromagnetic Flowmeter is widely used in the following scenarios:

Mineral Processing Flows:Used for accurately measuring slurry flow rates in various stages from crushing, grinding to flotation, and thickening, providing critical data for process control and reagent addition, optimizing recovery rates.

Tailings Transport:Installed on tailings pipeline to monitor discharge volume, enabling safe and environmentally friendly tailings dam management.

Concentrate Pipeline Transport: Used for flow custody transfer and pump station operation monitoring in long-distance concentrate pipeline transport.

Coal Water Slurry Flow Measurement: Precisely measures the flow of coal water slurry in the coal chemical industry, ensuring stable operation of equipment like gasifiers.
During field installation, ensure sufficient straight pipe runs upstream and downstream of the flowmeter, install full-pipe, and ground correctly to eliminate interference and achieve optimal measurement results. Its robust design enables it to withstand vibration and impact common in mining sites.

6. Conclusion​
The SLDF7200 series MagFlow Slurry Electromagnetic Flowmeter, leveraging its reliable measurement foundation based on electromagnetic induction principle and its design specifically for harsh slurry conditions – including wear-resistant linings, high-frequency excitation, non-clogging structure, and rugged housing – successfully addresses the core challenges in mining flow measurement. It not only provides high accuracy and high repeatability measurement results but also boasts excellent durability and maintainability, supporting flexible power supply and communication options. This product is an ideal choice for enhancing mining production efficiency, achieving refined management, and ensuring safe operation, demonstrating significant technical advantages and economic benefits in various slurry measurement applications.