Technical Specifications of FM500 High-Precision Gear Flow Meter?

Product Overview?

The FM500 high-precision gear flow meter is a positive displacement (volumetric) flow meter capable of detecting ultra-low liquid flow rates as minimal as 0.5 mL/min while maintaining an accuracy of ±0.5% F.S. It is designed for precise micro-flow measurement applications.

Working Principle?

Mechanism?: Utilizes a pair of elliptical gears within a metering chamber. The gears rotate under fluid pressure, trapping and discharging a fixed volume of liquid per cycle. Total flow is calculated as:

Total Flow = Gear Rotations × 4 × Displacement per Cycle?.

Advantages?: Measurement accuracy is unaffected by fluid viscosity, density, flow state, or Reynolds number due to its volumetric design.

Key Features?

Accuracy?: ±0.5% or ±0.2% (customizable).

Viscosity Range?: 2–200 mPa·s (extendable for higher viscosities).

Temperature Range?:

Standard: -20°C to +80°C.

With heat sink: Up to 200°C.

Pressure Rating?:

Cast iron/stainless steel: 1.6 MPa.

Cast steel: 2.5 MPa or 6.4 MPa (customizable).

Materials?: Cast iron, cast steel, or stainless steel (316L).

Output Options?:

Pulse signal (Hall effect/reed switch).

4–20 mA analog output.

Power supply: 24V DC.

Explosion Proof?: ExiaIICT5 certification for hazardous environments.

Optional Features?: Insulated jacket for high-temperature applications.

Limitations?

Unsuitable Media?: Fluids containing solid particles (risk of gear jamming) or gases (measurement errors).

Viscosity Impact?: Higher viscosity reduces leakage between gear gaps, improving accuracy.

Applications?

Industries?: Petroleum, chemical, power, metallurgy, food/pharmaceutical manufacturing, agriculture, and environmental monitoring.

Media?: Diesel, gasoline, lubricants, acids, alkalis, and high-viscosity fluids (e.g., resins, asphalt).

Installation Notes?

Ensure full-pipe flow without air bubbles.

Horizontal installation preferred; vertical installation requires upward flow.

Regular maintenance (quarterly) to prevent particle accumulation.

Customization?

Configurations available for special requirements (e.g., high pressure, extreme temperatures).