1. What it is

The ADMAG TI Series AXG (including the AXG150 size variant) is a magnetic (electromagnetic) flowmeter made by Yokogawa. According to their data sheet:

• It is designed for industrial process lines (oil & gas, chemical, pulp & paper, food & beverage, metal & mining).
• It measures the volumetric flow of conductive liquids by the electromagnetic principle. Specifically, the general spec sheet states: “By applying the occurrence of electromotive force proportional to the flow velocity when fluid moves in the magnetic field...”
• The “150” in AXG150 refers to a nominal pipe size of 150 mm (6 inch) in that model variant.

2. How it works (Principle of Operation)

• The flowmeter’s sensor includes a measuring tube lined with an insulating liner (e.g., PFA or ceramic) and has two electrodes mounted on the tube wall.
• A magnetic field is applied across the flow path, and as the conductive fluid flows through, a voltage (emf) is induced between the electrodes proportional to the fluid’s velocity. The instrument converts that into a volumetric flow rate (and integrated flow).
• Because it is based on velocity and cross-section, the measurement is largely independent of fluid density, viscosity, temperature (within limits) and has no moving parts (which reduces wear).
• In the AXG family, one of the key enhancements is the “dual frequency excitation method” which helps maintain stable measurement in fluids with high flow disturbances, slurries, or where conductivity is challenging.

3. Key Specifications & Features

Here are some important details of the AXG (and specifically applicable to AXG150) – note that the exact spec may depend on config/liner/electrode options:

Nominal Size & Flow Tube

• Available sizes from 2.5 mm to 500 mm (0.1 in to 20 in) in the AXG series.
• The AXG150 specifically: 150 mm / 6 in nominal diameter variant.

Liner & Electrode Materials

• Liner options: PFA (fluorocarbon) or ceramic tube depending on application.
• Electrode materials: For example stainless steel 316L, nickel-alloy, tantalum, platinum-iridium, based on fluid compatibility.
• Lining and electrode choices influence suitability for aggressive media, slurry, corrosive fluids, etc.

Accuracy & Conductivity

• Standard accuracy: typically ±0.3% of reading for many sizes. For certain sizes (25–200mm) high accuracy variant: ±0.15% of reading.
• Minimum fluid conductivity: The spec sheet mentions low-conductivity fluids are a challenge; the AXG line is improved but there are practical limits (very low conductivity or non-conductive fluids are problematic).

Connections, Communications & Diagnostics

• Process connection: Supports wafer, flange, ASME, EN, JIS standards as required.
• Communications: Several protocol options: HART, FOUNDATION Fieldbus, PROFIBUS PA, Modbus.
• Diagnostics / maintainability: The AXG series offers built-in verification, monitoring of electrode insulation deterioration, flow noise/conductivity monitoring diagnostic functions.
• Some variants designed for safety instrumented systems (SIL) compliance: e.g., IEC 61508 optional specs.

Example from Retail Spec (AXG150)

From one listing:

• Size: 150mm (6 inch)
• Lining: PFA
• Electrode: Nickel Alloy
• Grounding Rings: stainless steel 316L thin type
• Accuracy: standard (±0.3%)
• Power supply: 24 VAC/DC (for this listing)
• Process connection: ASME Class 150 wafer.

4. Typical Applications

Given its features, the AXG150 / AXG series is well-suited for:

• Process industries: especially where fluids are conductive and the environment is demanding (chemical plants, oil/gas, metals, mining, pulp & paper).
• Applications with slurry, high solids content, or where flow noise or variable conductivity might otherwise challenge a flowmeter — thanks to the dual frequency excitation.
• Inline measurement of liquids (not suitable for non-conductive media, gases or steam).
• Situations where diagnostics, communication and integration into automation/control systems are important.

5. What to Consider / Specify

When selecting and installing an AXG150 or similar, keep these in mind:

• Fluid conductivity: Magnetic flowmeters require conductive fluid (typically minimum a few μS/cm) else accuracy/ stability may suffer. The spec shows caution for low-conductivity fluids.
• Liner & electrode material compatibility: Choose liner based on chemical/abrasive nature of the fluid. For aggressive fluids or high abrasion/slurry, ceramic liners or special electrodes may be required. The spec sheet provides recommendation for slurries/adhesive fluids.
• Pipe straight-run, grounding and installation: For best performance, typical installation rules apply (straight pipe run upstream/downstream, proper grounding rings or electrodes). Especially for large diameter (150mm) ensure flow profile is stable.
• Size selection & flow velocity: Oversizing meter can reduce velocity and reduce measurement accuracy or stability; undersizing can create high pressure drop or turbulence. For 150mm size you should ensure flow rate suits that bore.
• Communication / transmitter version: Many options for communication; choose the one compatible with your control system (HART, Profibus, etc).
• Diagnostics/maintenance: The enhanced diagnostics are useful for preventive maintenance — use these features to monitor condition (electrode wear, conductivity drift, etc).
• Environmental / explosion hazard / approvals: If the meter is to be used in hazardous areas, ensure the correct explosion-proof or intrinsically safe version is chosen.
• Calibration & verification: Particularly for critical applications, ensure calibration and verification are addressed (either factory or on-site). The AXG manual provides indicators for verification.