The AdBlue flow meter is used to precisely track the volume of urea water solution being transported. It is mainly divided into two types: mechanical and digital, suitable for different operating environments.

Mechanical Flow Meter

It relies on the liquid flow to drive the internal mechanical components to rotate, without the need for an external power source. It is suitable for ordinary gas stations and mobile pumps.

Turbine Flow Meter

The liquid drives the rotor to rotate along the flow direction, and the rotational speed is proportional to the flow rate.

Elliptical Gear Flow Meter

The liquid pressure drives a pair of gears to mesh and rotate, and each rotation captures a fixed volume, providing accurate cumulative measurement.

Digital Flow Meter

It is equipped with electronic sensors, which can display data on-site and transmit it remotely, facilitating integration with fleet management systems.

Digital Turbine Flow Meter

The microprocessor counts the rotating pulses and supports on-site calibration and adjustment.

Electromagnetic flowmeter

Measures the speed of conductive fluids using a magnetic field, has no moving parts, and has high durability.

Digital models usually come with communication interfaces, suitable for central computer systems.

AdBlue flow measurement working principle

Application scenarios are divided into on-board SCR system refueling and industrial batch transfer, with completely different principles.

On-board SCR system: Does not directly use on-line flowmeters. The control unit calculates the required AdBlue injection volume based on fuel consumption rate, achieving precise measurement by adjusting pump pressure (4–6 bar) and injector opening and closing cycles. During maintenance, a “measurement volume test” can be conducted: pulse injector, measuring the injected milliliters within a specified time (such as 30 seconds) (usually 25–30 ml) to verify system performance.

Industrial batch transfer (from storage tanks to nozzles, tanker filling, etc.): Install physical flowmeters (commonly electronic elliptical gears or turbine types, with materials resistant to urea corrosion) in the pipeline. The fluid drives the gears or turbines, magnetic sensors record the movement, and the LCD screen displays the cumulative volume.

Key considerations in system design

Freezing and calibration: AdBlue freezes at -11°C, expansion can damage internal components and affect accuracy, so a heater must be equipped.

Material compatibility: Dissolving metals can poison the SCR catalyst, strict material selection is necessary.

Permitted: 304/316 stainless steel, polypropylene, PTFE (anti-corrosion, maintains purity).

Prohibited: Carbon steel, copper, zinc, brass (causes pollution, reduces catalytic efficiency).

Pipeline layout: Sharp elbows or changes in diameter cause turbulence, resulting in measurement errors. During installation, it is required to leave a sufficient straight pipe section before the instrument to ensure a stable flow state.

Conclusion

Industrial operations rely on AdBlue flow meters to precisely control the volume of fluids, protect SCR catalysts, and must comply with the ISO 22241 standard to prevent urea crystallization and maintain solution purity. Precise measurement not only avoids component corrosion and ensures smooth system operation, but also ensures the authenticity and reliability of financial data during batch transfers. Comprehensive selection, installation, and maintenance are key steps in achieving efficient and environmentally friendly post-treatment.