partially filled electromagnetic flow meter
Engineered for conductive liquids in non-full-pipe conditions—this flowmeter applies the velocity-area method, measuring flow velocity electromagnetically while continuously tracking liquid level to calculate true volumetric flow. Unlike conventional electromagnetic flowmeters limited to horizontal full-bore closed pipes, it maintains accurate, continuous measurement across half-pipe flow, gravity-fed lines, intermittent discharge, and high liquid-level-variation conditions—all without weirs, flumes, or additional infrastructure.
- Pipe Size: DN100 – DN2000
- Flow Accuracy: ±2.5%
- Velocity: 0.05 – 10 m/s
- Temperature: -25°C to +80°C
- Protection: IP68 available
- Bi-directional Measurement
Request QuotationTechnical Consultation
Accurate Flow Measurement Regardless of Fill Level
Uses the velocity-area method-electromagnetic velocity sensing combined with continuous liquid level tracking—to calculate true volumetric flow at any fill level from approximately 10% to 100% of pipe diameter. Handles round, rectangular, and irregularly shaped pipes without switching instruments or reconfiguring settings.
Stable Accuracy Across Variable Fluid Conditions
Electromagnetic measurement is unaffected by changes in fluid viscosity, density, or temperature. Provided conductivity meets the minimum threshold (≥20 μS/cm), performance remains consistent across clean water, municipal sewage, industrial effluent, and particulate-laden flows—without adjustment.
Fits Existing Pipelines—No Structural Modification Needed
Mounts directly to existing gravity-fed pipelines with minimal straight-pipe requirements. No weirs, flumes, or civil works. Practical for drainage retrofits, pump station upgrades, and any site where excavation or pipe modification would be disruptive or costly.
No Moving Parts—No Clogging, No Mechanical Wear
Fully open bore with no throttling elements. Solids, sediment, fibers, and particulates pass through freely. Eliminates the blockage and accelerated wear that cause mechanical meters to fail in raw sewage, industrial wastewater, and stormwater applications.
Remote Monitoring for Dispersed and Hard-to-Access Sites
Modbus, GPRS, and 4G wireless support enables direct integration into water management, environmental monitoring, and pump station control systems. Real-time data transmission replaces manual site visits at underground chambers, remote drainage points, and dispersed irrigation networks.
IP68-Rated for Submersible and Chemically Demanding Environments
Liner and electrode materials resist corrosion and abrasion from industrial effluents, sandy wastewater, and aggressive chemicals. IP68 protection allows permanent installation in underground wet wells, submerged chambers, and flood-prone environments without additional weatherproof housing.
Item | Specification |
|---|---|
Measurement Principle | Electromagnetic (Faraday's Law) + Ultrasonic Level Sensor |
Pipe Size Range | DN100 – DN2000 (larger sizes available on request) |
Flow Accuracy | ±2.5% of reading (±1.5% optional for critical applications) |
Velocity Accuracy | ±1.0% of reading |
±2mm | Conductive liquids (min. conductivity ≥ 5μS/cm), slurries, pulps |
Velocity Range | 0.05 – 10 m/s |
Flow Velocity Range | -25°C to +80°C (standard) | up to +180°C (custom order) |
Pressure Rating | 1.6 MPa (standard) | Higher pressure available |
Conductivity Requirement | ≥ 20 μS/cm (suitable for most wastewater and tap water) |
Power Supply | 85-250V AC (45-63Hz) or 20-36V DC | Battery option: 5+ year life |
Output Signals | 4-20mA, Pulse (1-2000Hz), Frequency, RS485 |
Communication Protocols | Modbus RTU (standard) | HART, Profibus DP (optional) |
Protection Rating | Sensor: IP65 / IP67 / IP68 | Converter: IP65 |
Display | Large backlit LCD: flow, velocity, level, forward/reverse totals |
Explosion-Proof | SIL-3 Certification |
Quality Standards | CE Certification |
Diagnostics | Empty pipe detection, excitation alarm, self-diagnostic functions |
Liner & Electrode Material Selection Guide
Choose materials precisely matched to your fluid chemistry for maximum service life
Lining Material | Temperature Range | Best Applications |
|---|---|---|
Polychloroprene Rubber | -25°C to +80°C | Municipal wastewater, drinking water, mild industrial chemicals, general purpose applications |
PTFE (F4) | -40°C to +180°C | Strong acids (H₂SO₄, HCl, HNO₃), alkalis, organic solvents, high purity chemicals |
F46 / PFA | -40°C to +180°C | Pharmaceutical manufacturing, ultra-pure water systems, food grade applications, semiconductor |
Electrode Material | Corrosion Resistance | Typical Applications |
|---|---|---|
SUS316L | General purpose, moderate corrosion resistance | Potable water, domestic wastewater, neutral pH chemicals, non-chloride environments |
Hastelloy B (HB) | Excellent for non-oxidizing acids | Hydrochloric acid (all concentrations), reducing chemical environments |
Hastelloy C (HC) | Superior for oxidizing acids and chlorides | Sulfuric acid, chromic acid, ferric chloride, wet chlorine, hypochlorite solutions |
Titanium (Ti) | Excellent for seawater and chlorides | Seawater, brackish water, sodium hypochlorite, chlorine dioxide, brine solutions |
Tantalum (Ta) | Extreme corrosion resistance | Highly corrosive acids, pharmaceutical chemicals, HCl/H₂SO₄ mixtures, aqua regia |
Platinum-Iridium Alloy | Universal chemical resistance | Ultra-pure applications, extreme chemical conditions, research laboratories |
Protection Class
- IP65: Dust-tight, protected against water jets—suitable for general indoor environments
- IP67: Dust-tight, withstands temporary immersion—suitable for humid environments, short-term water exposure
- IP68: Dust-tight, continuous submersion—suitable for underground pipelines, frequent water submersion, up to 3 meters depth
Municipal Wastewater
- CSO monitoring & reporting
- Gravity sewer flow measurement
- WWTP influent/effluent tracking
- Pump station flow control
- I&I analysis programs
Stormwater Systems
- Urban drainage monitoring
- Runoff quantity measurement
- Flood control systems
- Hydrological studies
- Detention basin overflow
Irrigation & Agriculture
- Canal flow measurement
- Water distribution networks
- Agricultural drainage ditches
- Irrigation return flow
- Water rights allocation
Industrial Discharge
- Process wastewater discharge
- Cooling water return lines
- Compliance flow monitoring
- Rainwater collection systems
- Non-pressurized process flows
Critical Installation Requirements
1. Flow Sensor Orientation
The electromagnetic flow sensor must be installed at the 6 o’clock position (pipe bottom) for non-full-pipe measurement. Electrode orientation must be horizontal (3 o’clock and 9 o’clock positions). Incorrect orientation will cause measurement errors or complete failure.
2. Liquid Level Sensor Position
Liquid level sensor must be mounted at pipe crown (12 o’clock position) directly above the flow sensor. Vertical offset between sensors will introduce systematic error in flow area calculation.
3. Grounding
Both sensor body and converter must be properly grounded. For plastic or lined pipe installations, use grounding rings or grounding electrodes to establish electrical contact between fluid and sensor ground.
5. Cable Routing
Signal cables must be run separately from power cables. In electrically noisy environments (near VFDs, large motors, or high-voltage switchgear), use shielded twisted-pair cable and ground shield at converter end only.
Pipe Material & Configuration Considerations
Metallic Pipes (Steel, Stainless, Ductile Iron):
Sensor body can be grounded directly through flange connection. Ensure paint, rust, or coating does not prevent electrical continuity between sensor and pipe.
Non-Conductive Pipes (PVC, FRP, HDPE, Concrete) :
Grounding rings or electrodes required to establish electrical reference. Consult factory for grounding electrode configuration based on pipe size and fluid conductivity.
Rectangular or Non-Circular Pipes:
Flow area calculation requires accurate entry of hydraulic dimensions. For trapezoidal or irregular sections, consult factory for custom flow area programming.
Ready to Reduce Your Large-Pipe Metering Costs?
Our application engineers will help you determine optimal sensor positioning, accuracy class selection, and configuration requirements for your specific pipeline.
info@hbmeter.cc
(+86) 152-3780-0315
1 Jingsan North Road, Xiangfu District, Kaifeng, Henan 475004 China
About HBmeter
AFT Instruments is a high-tech manufacturer delivering precision flow instrumentation for water, chemical, power, industrial automation, and process industries.
View moreContact Us
info@hbmeter.cc
(+86) 152-3780-0315
(+86) 152-3780-0315
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