Thermal Gas Mass Flow Meter

The thermal mass flow meter utilizes advanced thermal diffusion technology and the isothermal difference method to directly measure mass flow without the need for pressure/temperature compensation. It features high accuracy, a wide 100:1 turndown ratio, and excellent low-flow sensitivity, making it suitable for various gas monitoring applications. The probe-type design reduces gas flow resistance, lowers energy consumption, maintains system pressure, and is robust, durable, and low-power with no moving parts, ensuring long-term stability and low maintenance requirements. It is an ideal choice for compressed air, biogas, and industrial gas systems.

  • Specification

Technical Specifications & Engineering Parameters

Measurement Principle Thermal dispersion technology (Constant temperature differential principle)
Direct Measurement Direct mass flow rate and standard volume without external temp/pressure compensation
Nominal Pipe Size Inline flanged type: DN15 to DN300; Insertion type: DN80 to DN2000+
Applicable Gases Compressed air, Nitrogen (N2), Oxygen (O2), Argon, Carbon dioxide (CO2), Biogas, Flue gas
Measurement Accuracy ±1.0% to ±1.5% of reading + 0.5% F.S.
Flow Velocity Range 0.1 to 100 Nm/s (Extremely low flow sensitivity starting at 0.05 Nm/s)
Turndown Ratio 100:1 (Wide dynamic range)
Operating Pressure Inline type: Up to 4.0 MPa; Insertion type: Up to 2.5 MPa (Hot-tap retractable option)
Medium Temperature Standard: -20°C to +120°C; High-temp version: up to +350°C
Wetted Material Stainless Steel 316L, Hastelloy C wetted sensor probes
Output & Communication 4-20mA current loop, Scaled pulse, RS485 Modbus-RTU, HART protocol
Ingress & Explosion Rating IP65 enclosure / Ex d IIC T6 Gb flameproof approval

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