From DN15 to DN2000: Why the Aister ATMF is the Reliable Choice for All Industrial Gases

"In industrial gas metering, the most expensive data is the data that requires an assumption."

When you rely on temperature and pressure compensation, you aren't measuring gas—you are calculating an estimate. The Aister ATMF Series eliminates this layer of uncertainty. By utilizing the Constant Temperature Differential (CTA) principle to count molecules directly, we provide a measurement that remains stable even when your process environment is in flux. With a 100:1 turndown ratio and zero moving parts, it is a solution built for the physics of the real world, not the ideals of a lab.

1. Core Principle: Precision Through Thermal Diffusion

Unlike meters that measure volume, the ATMF series utilizes the Constant Temperature Differential (CTA) Principle. This allows for direct measurement of gas "molecular count," meaning you get the truth regardless of environmental fluctuations.

• The Dual-Sensor Design: The meter features two high-precision platinum RTDs.

  • Heating Sensor ($R_1$): Acts as the active thermal source.

  • Reference Sensor ($R_2$): Monitors the ambient gas temperature.

• The Mechanism: As gas molecules flow past $R_1$, they carry away heat. The circuit dynamically increases power to maintain a fixed temperature difference (e.g., 20°C) between the sensors.

• The Advantage: This power consumption is directly proportional to the Mass Flow.

  Key Benefit: NO temperature or pressure compensation is required. This significantly reduces installation complexity and eliminates error accumulation.

2. Product Matrix: Engineered for Every Pipe Size

Aister Instrument provides a versatile product line designed to fit seamlessy into any industrial infrastructure, from DN15 to DN2000.

3. Performance Highlights: Why Choose the ATMF Series?

Our instruments are designed to tackle the "pain points" of industrial metering:

• 100:1 Ultra-Wide Turndown: Capable of detecting micro-leaks at 0.1 Nm/s while accurately tracking high-velocity surges up to 120 Nm/s.

• Zero-Maintenance Design: With No Moving Parts, there is zero mechanical wear and tear, ensuring long-term stability in 24/7 operations.

• Rapid Response Time: Real-time data capture in ≤1s (0.5s for fast-response models), perfect for dynamic process loops.

• Sonic Nozzle Calibration: Every unit is strictly calibrated using Sonic Nozzle Gas Flow Standards, ensuring 100% data traceability.

4. Global Industry Applications

The ATMF series is trusted by over 200 Fortune 500 enterprises across a diverse range of sectors:

• Petrochemical & Gas: Natural gas/LPG metering, flare gas monitoring, and process gas blending.

• Power & Energy: Boiler air systems, gas turbine intake, and coal-bed methane measurement.

• Environmental Protection: CEMS (Continuous Emission Monitoring), VOCs treatment, and flue gas tracking.

• Metallurgy & Steel: Blast furnace/coke oven gas measurement and oxygen-enriched combustion control.

• Food & Pharma: Sterile $N_2$ blanketing and $CO_2$ dosing for carbonation.

5. Expert Installation & Sizing Guidelines

To achieve the highest precision, our engineering team recommends the following standards:

1. Straight Pipe Integrity: Ensure at least 10D upstream and 5D downstream (D=Diameter) to maintain a stable flow profile.

2. Insertion Depth: For insertion models, the probe must be positioned at the center 1/3 of the pipe—the point of maximum velocity.

3. Media Customization: While ideal for clean gases (Air, $N_2$, $O_2$, $Ar$), we offer specialized anti-contamination coatings for "dirty" or moist gases like Coke Oven Gas.

At Aister Instrument, we don’t just ship boxes—we deliver peace of mind. As a high-tech powerhouse serving over 200 of the Fortune 500, we understand that in your facility, downtime is not an option. That’s why every ATMF meter is rigorously calibrated via Sonic Nozzle Standards and backed by two decades of field-proven reliability.

Don't let inaccurate data drain your budget for another day. Whether you need a custom solution for 220°C hazardous gas or a simple air line monitor, our engineers are ready to build it for you.

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