Positive displacement flow meter YUNYI 4G

volumefor gasflange

Overview
The YUNYI 4G Wireless Roots flow meter is a volumetric (Roots rotary) gas meter designed for precise measurement of non-corrosive gases. It integrates flow, temperature and pressure detection with automatic temperature and pressure compensation to display corrected total volume under standard conditions.

Operating principle
The meter uses a pair of precision-machined conjugate rotors (waist wheels) that rotate alternately under the pressure differential between inlet and outlet. Each full rotation discharges a gas volume equal to four times the effective volume of the metering chamber. A magnetic sealed coupling and reduction mechanism transmit rotor revolutions to the totalizer for accurate cumulative volume calculation and display.

Advantages and features

• Measurement performance: accuracy up to ±1.0%, high repeatability and wide turndown ratio (up to 1:216); extremely low starting flow for measurement across large load variations.
• Communication and power: ultra-low power electronics with multi-year battery life (typically >5 years); optional wireless modules (4G/DTU, GPRS/CDMA) and RS-485 interface for remote data transmission.
• Installation and protection: fully sealed housing with IP65 rating; intrinsically safe explosion-proof certification (ExiaⅡCT4); does not require straight pipe sections upstream or downstream.
• Data functions and diagnostics: onboard historical data storage, self-diagnostic functions and alarm outputs including low battery alerts to support maintenance and monitoring.

Application areas

• Urban gas and energy metering: transmission and distribution, gas regulation stations, commercial and residential billing applications.
• Petrochemical and industrial processes: oilfields, petrochemical plants, metallurgy and power generation measuring non-corrosive gases (natural gas, coal gas, biogas, industrial inert gases).
• Environmental and energy recovery projects: monitoring flows in biogas utilization and other energy recovery systems.

Technical specifications

• Measurement principle: volumetric (Roots rotary / gas rotary)
• Accuracy: up to ±1.0%
• Repeatability: high
• Turndown ratio: up to 1:216
• Starting flow: extremely low (suitable for large load variation)
• Compensation: automatic temperature and pressure compensation; displays total volume under standard conditions
• Rotors: pair of precision-machined conjugate rotors; one full rotation discharges gas equal to four times the effective metering chamber volume
• Transmission: magnetic sealed coupling and reduction mechanism to totalizer
• Electronics: microcontroller-based intelligent electronics
• Power: ultra-low power consumption; built-in battery with extended life (typically over 5 years)
• Communications (optional): RS-485; DTU module; wireless modules such as 4G, GPRS/CDMA
• Protection and safety: fully sealed housing; IP65; intrinsically safe explosion-proof certification (ExiaⅡCT4)
• Installation: no requirement for straight pipe sections upstream/downstream; suitable for confined spaces
• Data functions: onboard historical data storage, self-diagnostics and alarm functions (including low battery alerts)