Positive displacement flow meter

volumefor gasfor natural gas

Overview
YUNYI Lora Wireless Roots flow meters, also known as gas rotary flow meters, are high-precision, highly reliable gas metering instruments based on volumetric measurement principles. They integrate flow, temperature, and pressure detection functions, perform automatic temperature and pressure compensation calculations, and directly display total volume under standard conditions.

Operating Principle
The core operating principle utilizes a pair of precision-machined conjugate rotors (waist wheels) that rotate alternately under the pressure differential between the inlet and outlet fluids. Each complete rotation of the rotors discharges gas equivalent to four times the effective volume of the metering chamber. Through a magnetic sealed coupling device and a reduction mechanism, the rotor’s rotation count is transmitted to the totalizer, enabling precise calculation and display of the cumulative volumetric flow rate.

Product Advantages and Features

• Superior Measurement Performance: Features high accuracy (up to ±1.0%), high repeatability, and a wide turndown ratio (up to 1:216). With an extremely low starting flow rate, it can precisely measure gas flow with significant load variations.
• Smart and Wireless Capabilities: Utilizes ultra-low power technology and microcontroller technology for extended battery life (typically over 5 years). Optional wireless transmission modules and communication interfaces (for example GPRS/CDMA modules, RS-485 interface, DTU) enable remote data transmission and integration into monitoring systems.
• Rugged Construction and Ease of Use: Requires no straight pipe sections upstream or downstream, allowing installation in confined spaces. Fully sealed design with IP65 protection rating and intrinsically safe explosion-proof certification (ExiaⅡCT4) ensures safety and reliability.
• Data Management and Diagnostics: Features comprehensive data storage for recording historical flow data. Includes self-diagnostic and alarm functions such as low battery alerts to facilitate maintenance.

Application Areas

• Urban gas and energy metering: natural gas transmission and distribution metering, gas regulating station metering, commercial billing and residential boiler gas metering.
• Petrochemical and industrial production: oilfields, petrochemical plants, metallurgy, power generation — measuring non-corrosive gases such as industrial inert gases, coal gas, natural gas, and biogas.
• Environmental protection and energy recovery: flow monitoring in energy recovery projects like biogas utilization.

Caractéristiques / spécifications techniques

• Measurement principle: Volumetric (Roots / gas rotary) using a pair of conjugate rotors (waist wheels).
• Integrated detections: Flow, temperature and pressure detection with automatic temperature and pressure compensation; displays total volume under standard conditions.
• Accuracy: Up to ±1.0% (depending on configuration).
• Repeatability: High repeatability (manufacturer-specified).
• Turndown ratio: Up to 1:216.
• Starting flow: Extremely low starting flow capability for accurate measurement at very low flows.
• Transmission & communication: Optional wireless transmission modules (e.g., GPRS/CDMA), RS-485 interface and DTU support for remote data transmission and integration.
• Power: Ultra-low power design with microcontroller technology; designed for long operation on built-in battery (typical battery life over 5 years depending on configuration and use).
• Mechanical features: Magnetic sealed coupling and reduction mechanism to transmit rotor rotation to totalizer.
• Protection & safety: Fully sealed design; IP65 protection rating; intrinsically safe explosion-proof certification ExiaⅡCT4.
• Data features: Onboard historical data storage, self-diagnostics and alarm functions (e.g., low battery alarm).