MJK Electromagnetic Flow Meter

Overview

The MJK Electromagnetic Flow Meter is a precision-engineered online flow measurement instrument designed for continuous, non-intrusive volumetric flow monitoring of conductive liquids in industrial process control and water infrastructure applications. Based on Faraday’s Law of Electromagnetic Induction, the meter measures flow velocity by detecting the voltage induced across a moving conductive fluid as it passes through a magnetic field generated by integral coils. This principle ensures zero pressure drop, no moving parts, and immunity to changes in fluid density, viscosity, temperature, or pressure—making it ideal for wastewater, potable water, irrigation canals, pump stations, and industrial effluent pipelines. Developed by MJK—a brand under Xylem Analytics headquartered in Nærum, Denmark—the device is engineered for long-term stability, high reproducibility, and compliance with international metrological standards for custody transfer and process optimization.

Key Features

• Measurement accuracy up to ±0.25% of reading over a wide flow range (DN15 to DN1400 pipe diameters)
• Bi-directional flow detection with automatic flow direction adaptation—no manual configuration required
• Robust IP67 or IP68-rated housing for submersible or outdoor installation in harsh environments (e.g., wet wells, open channels, pump houses)
• Integrated remote display option supporting local readout and real-time diagnostics without external terminals
• Electrode materials (e.g., stainless steel 316L, Hastelloy C, titanium) selectable based on fluid compatibility and corrosion resistance requirements
• Low-maintenance design with no mechanical wear components, eliminating routine calibration drift associated with mechanical meters
• Support for multiple communication protocols including Modbus RTU/ASCII, Modbus TCP/IP, and optional integration with SCADA, DCS, and IIoT platforms

Sample Compatibility & Compliance

The MJK Electromagnetic Flow Meter is validated for use with conductive liquids having minimum conductivity ≥5 µS/cm—covering municipal wastewater, treated effluent, raw surface water, brackish irrigation water, and many industrial process streams. It complies with EN 14154-1:2017 (water meters—electromagnetic types), IEC 61511 (functional safety for SIS in process industries), and supports audit-ready documentation per ISO/IEC 17025 and GLP/GMP-aligned data integrity practices. Optional firmware configurations enable 21 CFR Part 11-compliant electronic signatures and secure audit trails when integrated with validated SCADA systems.

Software & Data Management

The meter operates with embedded firmware supporting configurable pulse output, analog 4–20 mA current loop, and digital serial communication. Optional MJK SmartLink software provides configuration, diagnostics, and historical trend analysis via USB or Ethernet connection. All configuration changes are timestamped and logged with user ID attribution. Data export supports CSV and XML formats compatible with LIMS, asset management systems (CMMS), and regulatory reporting frameworks. Remote firmware updates are supported over secure TLS connections, ensuring continued alignment with evolving cybersecurity best practices (IEC 62443-3-3).

Applications

• Real-time flow monitoring at wastewater treatment plant influent/effluent points and pumping station discharge lines
• Leak detection and district metered area (DMA) balancing in municipal water distribution networks
• Flow verification in irrigation districts where variable head and sediment-laden water challenge mechanical metering
• Process flow validation in food & beverage, pharmaceutical, and chemical plants requiring hygienic-grade measurement traceability
• Environmental compliance reporting for discharge permits (e.g., EPA NPDES, EU Urban Wastewater Treatment Directive)
• Integration into smart water grid initiatives leveraging IIoT architecture for predictive maintenance and energy optimization

FAQ

What is the minimum fluid conductivity required for reliable operation?
The meter requires a minimum electrical conductivity of 5 µS/cm; performance is verified down to 2 µS/cm under controlled calibration conditions.
Can the flow meter operate submerged continuously?
Yes—IP68-rated variants are certified for permanent submersion up to 10 meters depth with appropriate cable gland sealing.
Is bidirectional flow measurement factory-configured or user-enabled?
Bidirectional capability is enabled by default in firmware; no hardware modification or additional licensing is required.
Does the device support HART protocol?
HART is not natively supported; however, Modbus RTU over 4–20 mA with digital overlay is available as an alternative interface option.
How is calibration traceability maintained during field service?
Each unit ships with a factory calibration certificate traceable to DKD/DAkkS-accredited standards; field verification kits and portable calibrators compatible with ISO 4064-2 are recommended for periodic checks.