Understanding the Core Challenge in Gas Roots Flow Meter Selection

Gas distribution networks face a persistent measurement challenge: achieving high-precision volumetric metering that remains reliable under varying pressure and flow conditions. For commercial settlement to be accurate, metering equipment often needs integrated temperature and pressure compensation, since raw working-condition flow does not reflect true standard volume. This is the central problem that Kaifeng Xinya Instrument Co., Ltd., operating under the Xinya Instrument brand, set out to address as a specialized provider of volumetric gas metering solutions for urban gas management.

Core Technology Behind the Xinya Gas Roots Flowmeter

At the heart of Xinya's approach is a roots-wheel structure with synchronous gears, which ensures measurement accuracy independent of flow profile and requires no straight pipe sections for installation — a practical advantage for space-constrained installations. This proprietary structure carries independent intellectual property rights, supporting improved production assembly and long-term stability.

Beyond the mechanical core, Xinya integrates high-precision temperature, pressure, and flow sensors with a volume correction instrument that performs automatic compression factor calculation. This correction is based on microprocessor-driven gas equation correction (PV/T), referencing SY/T 6143-2004 or SGERG-88 standards, allowing the meter to convert working-condition flow into standard volume in real time.

Key technical metrics that matter during selection include:

• Rangeability of up to 160:1 or more, meaning the meter can accurately capture both minimal pilot-light flows and peak industrial loads.
• Starting flow of less than 0.02 m³/h, enabling detection of very low consumption.
• Accuracy class of 1.0 and 1.5, meeting commercial settlement precision requirements.
• Maximum gas purchase capacity of 100 million m³ per transaction for prepayment applications.

For deployment flexibility, the meter head rotates 350°, and the housing supports both horizontal and vertical installation orientations, allowing engineers to adapt the unit to pipeline layout constraints rather than redesigning the pipeline around the meter.

Product Lineup for Every Deployment Scenario

HR Gas Roots Flowmeter
The HR series is an electronic single-display type built for digital-first metering. It addresses inaccurate billing caused by temperature and pressure fluctuations by combining sensors and microprocessors to output standard volume directly, removing the need for manual calculation. It features a high-contrast LCD showing standard cumulative flow and instantaneous flow, automatic temperature and pressure compensation, and signal diversity through RS485, pulse, and optional 4-20mA outputs. The intrinsically safe electrical design carries the Exia II CT4Ga explosion-proof rating.

HRM Gas Roots Flowmeter
The HRM series is a mechanical single-display type designed for environments with limited power supply or where mechanical backup is mandatory. Its mechanical counter provides continuous metering without external or battery power, while high-precision machined components support a long service life. It is delivered as flange-connected hardware.

HRS Gas Roots Flowmeter
The HRS series offers dual display — mechanical plus electronic — for maximum data redundancy. This configuration provides a mechanical backup to the electronic display, ensuring zero data loss during power failures, which is particularly relevant for commercial settlement applications where continuous record-keeping is essential.

Intelligent IC Card Prepayment System (-Y Suffix)
Designed for financial control and gas consumption management among commercial users, this system uses a zero pressure loss valve with a ball-valve structure equal in diameter to the pipe. Under the prepaid management model, users must purchase gas before consumption, and the valve closes automatically once credit is exhausted. The system supports purchases of up to 100 million m³, addressing fee collection difficulties for large industrial and commercial gas users.

IoT Wireless Module (-W Suffix)
This module enables remote monitoring and cloud-based management through multi-mode communication — GPRS, NBIoT, and Cat1 — and is compatible with the Xinya cloud platform as well as third-party IoT platforms.

Proven Performance in Real-World Applications

In a documented benchmark case involving a large-scale catering facility with high-volume natural gas requirements, Xinya deployed an HR-80-G100 gas roots flowmeter with integrated volume correction to address billing accuracy across varying peak and off-peak loads. The deployment achieved a 160:1 rangeability, capturing low-flow pilot lights starting at 0.02 m³/h alongside high-load cooking peaks, and delivered 100% billing accuracy across all operating conditions.

In an industrial boiler system scenario requiring standard volume conversion from working-condition flow in a temperature-fluctuating environment, the integrated PV/T equation converted 123.11 m³/h of working-condition flow into standard conditions while maintaining accuracy within the ±1.0% limit — demonstrating the practical value of built-in correction for boiler operators who cannot rely on manual conversion under fluctuating thermal conditions.

Certifications and Compliance Backing

Selecting a gas roots flowmeter also means evaluating regulatory compliance. Xinya's product family complies with GB/T 28848 "Intelligent Gas Flowmeter" national standard, the company's own Q/HD 003-2023 "Gas Roots Flowmeter" enterprise standard established in 2023, JJG 633 "Gas Positive Displacement Flowmeter" verification regulation, the OIML R6 international standard for global market compatibility, and JB/T 7385 "Gas Waist Wheel Flowmeter" industry standard. Safety credentials include the Exia II CT4Ga explosion-proof certification and IP66 protection grade. Product Type Test Certificates were obtained in 2017 (No. 2017F103-35) and updated in 2023 (No. 2023F129-35), reflecting a documented history of regulatory validation.

Service and Deployment Support

Beyond hardware, Xinya structures its offering as hardware sales combined with an IoT cloud platform and IC card management system. Service scope covers pre-sales specification selection, installation guidance, lubrication maintenance, and metrological verification. Devices offer a 5-year continuous battery life for metering, remote valve control, and data upload via IoT modules. Deployment options span horizontal or vertical flange installation from DN20 to DN200, with regular verification cycles of 2-3 years depending on accuracy class, standardized lubrication systems, and troubleshooting manuals to support long-term uptime.

Making the Right Selection

Gas roots flow meter selection ultimately depends on matching the application to the right configuration: HR for digital-first commercial settlement, HRM for power-limited or mechanically mandated environments, HRS for redundancy-critical installations, and the IC Card or IoT modules for prepayment and remote management needs. Across catering and hotel industries, transmission and distribution networks, industrial boiler systems, and civil engineering applications, Xinya Instrument's product matrix is built around the same core principle: integrating volumetric accuracy with intelligent correction so that gas utility companies, industrial plant operators, and commercial property managers can settle accounts based on standard volume rather than fluctuating working-condition readings.

https://www.sytcflowmeter.com/
Kaifeng Xinya Instrument Co., Ltd.