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Yokogawa AE220MN-AB1-LSA-A1DH/BR/FF1/FN1

Product Category: Electromagnetic Flowmeter (Magmeter)

Product Overview:
The AE220MN is Yokogawa’s high-accuracy electromagnetic flowmeter for measuring conductive liquids. The model code decodes as: AE220MN = Series designation, AB1 = PFA (perfluoroalkoxy) liner, LSA = Compact/integral type, A1DH = Electrode material code, BR = Output code, FF1 = Communication code, FN1 = Additional option code. It operates on Faraday’s Law of Electromagnetic Induction.

Detailed content

Technical Specifications:

  • Measurement Principle: Faraday’s Law of Electromagnetic Induction
  • Pipe Size RangeDN10 to DN3000 (0.4″ to 120″)
  • Liner MaterialPFA (AB1) — perfluoroalkoxy, chemically inert
  • Electrode Material Options: SUS316L (A1), Hastelloy C (DH), Tantalum (BR), Platinum (FN1)
  • Accuracy±0.5% of reading (±0.2% optional)
  • Measurement Media: Conductive liquids with conductivity ≥5 μS/cm
  • Output Signals4–20 mA DC, Pulse output, RS-485 (Modbus RTU / HART)
  • Process Temperature: -20°C to +180°C (PFA liner)
  • Process PressureUp to 4.0 MPa (40 bar) standard; higher ratings available
  • Protection Rating: IP68 (submersible capable)
  • Power Supply: 85–265 VAC / 24 VDC
  • DisplayNone on transmitter (configuration via HART/Modbus)
  • Response Time≤1 second (adjustable, 0.1–10 s)

Functional Features:

  • Empty pipe detection — outputs alarm when pipe is empty
  • Electrode fouling diagnosis — detects coating on electrodes
  • Bidirectional flow measurement — measures flow in both directions
  • Self-diagnostics — sensor status, signal quality, excitation monitoring
  • Low flow cutoff — configurable minimum flow threshold
  • Multi-output — 4–20 mA + pulse + digital communication simultaneous
  • Non-intrusive measurement — no pressure drop, no moving parts

Material Composition:

  • Pipe BodyCarbon steel with epoxy coating or SUS316L stainless steel
  • LinerPFA (perfluoroalkoxy) — AB1 designation, fully inert
  • Electrodes: SUS316L / Hastelloy C / Tantalum / Platinum (per configuration)
  • Transmitter HousingAluminum alloy with powder coat (IP68)
  • Cable Entry: M20 × 1.5 cable gland, SS316L

Structural Characteristics:

  • Connection TypeWafer type (lug connection) or Flanged (ANSI/DIN/JIS)
  • Face-to-Face: Per applicable standard
  • Compact design (LSA) — short face-to-face dimension
  • Transmitter Size: Approximately 200 mm × 160 mm × 120 mm
  • Weight: Varies by size, approximately 5–25 kg (DN50 to DN300)

Working Principle:
An electromagnetic coil generates a magnetic field perpendicular to the flow direction inside the liner-lined pipe. As the conductive fluid flows through this magnetic field, a voltage (E) is induced across the fluid proportional to flow velocity, per Faraday’s Law: E = B × D × V, where B = magnetic flux density, D = pipe diameter, V = fluid velocity. The electrodes mounted flush with the liner wall detect this induced voltage. The transmitter converts the voltage signal to a 4–20 mA output proportional to volumetric flow rate.

Key Advantages:

  • Zero pressure drop — full-bore design, no obstruction
  • ±0.5% accuracy — among the highest in the industry
  • PFA liner — chemically inert, suitable for aggressive chemicals
  • IP68 rating — can be submerged
  • Empty pipe detection — prevents false readings
  • No moving parts — zero maintenance requirement for the sensor

Applicable Industries:

  • Water & Wastewater Treatment (custody transfer, process water)
  • Chemical & Petrochemical (acids, alkalis, solvents)
  • Pharmaceutical (WFI, CIP solutions)
  • Food & Beverage (milk, juice, beer)
  • Mining & Minerals (slurries, tailings)
  • Pulp & Paper (white water, black liquor)

Installation Requirements:

  • Full pipe condition mandatory — meter must always operate full
  • Upstream straight pipe: Minimum 5D (D = pipe diameter)
  • Downstream straight pipe: Minimum 3D
  • Grounding rings required for plastic/lined pipes
  • Install in vertical or horizontal pipe (horizontal preferred, electrode axis horizontal)
  • Ensure minimum conductivity of 5 μS/cm in the process fluid

Usage Precautions:

  • Do not use for non-conductive fluids (pure water, hydrocarbons, gases)
  • Do not exceed maximum process temperature of +180°C (PFA liner)
  • Verify electrode material compatibility with process fluid
  • Never run dry — empty pipe causes electrode damage
  • Ground the meter properly — poor grounding causes measurement errors

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