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Gas Roots Flow Meter Manufacturer: 2026 Selection Guide

1. Introduction: Understanding the Gas Roots Flow Meter

A Gas Roots Flow Meter (also referred to as a Roots Gas Flow Meter, Rotary Gas Flow Meter, or Gas Waist Wheel Flowmeter) is a positive-displacement instrument used to measure the volumetric flow of non-corrosive gases such as natural gas, city gas, liquefied petroleum gas (LPG), nitrogen, and carbon dioxide. It operates independently of the flow velocity profile, which means it does not require long straight pipe sections before or after installation — a major advantage over many inferential flow measurement technologies.

Accurate gas measurement is essential because gas volume directly determines commercial settlement, safety monitoring, and energy accounting. Any inaccuracy in metering translates into billing disputes, revenue loss for gas utilities, or inefficient energy management for industrial users. Industries that commonly require precision gas flow measurement include:

• Urban gas transmission and distribution networks
• Catering and hotel industries (commercial gas billing)
• Industrial boiler systems
• Manufacturing plants using process gas
• Residential and civil engineering gas supply systems

2. Gas Roots Flow Meter Product Overview

Working Principle

The Gas Roots Flow Meter operates using a roots-wheel structure with synchronous gears. As gas passes through the meter body, two symmetrical rotors rotate in opposite directions, displacing a fixed volume of gas with each rotation. Because measurement accuracy is derived from mechanical displacement rather than flow profile, the meter maintains stable accuracy across varying pressure and flow conditions.

Product Structure

The core structure consists of:

• A precision-machined meter body housing synchronous roots wheels
• A mechanical or electronic counting/display module
• Optional integrated temperature, pressure, and flow sensors for volume correction
• A 350° rotating meter head to accommodate flexible installation orientation (horizontal or vertical)

Measurement Characteristics

• Rangeability: Up to 160:1 or more, allowing accurate measurement from very low pilot-light flows to high peak loads.
• Starting Flow: Less than 0.02 m³/h, enabling detection of minimal gas usage.
• Accuracy Class: 1.0 and 1.5, in compliance with JJG 633 "Gas Positive Displacement Flowmeter" verification regulation.
• Pressure Loss: Minimized due to the roots-wheel design, reducing energy loss across the metering point.

Technical Advantages

• No requirement for straight pipe sections, simplifying installation in constrained spaces.
• Integrated correction capability using microprocessor-based gas equation compensation (PV/T), with automatic compression factor calculation based on SY/T 6143-2004 or SGERG-88 standards.
• Intrinsically safe explosion-proof design (Exia II CT4Ga) suitable for hazardous gas environments.
• IP66 protection grade for durability in outdoor or humid installation conditions.

Suitable Operating Conditions

Gas Roots Flow Meters are designed for non-corrosive gases including natural gas, city gas, propane, nitrogen, and carbon dioxide, typically installed via flange connection in pipe sizes ranging from DN20 to DN200.

Gas Roots Flow Meter vs. Other Gas Flow Meters

Unlike inferential technologies (such as vortex or turbine meters) that depend on flow velocity profiles and often require straight pipe runs for accuracy, the Gas Roots Flow Meter provides direct volumetric displacement measurement. This makes it particularly suitable for commercial settlement applications where consistent accuracy across a wide flow range — including very low flows — is critical, such as billing for catering operations or fluctuating industrial boiler loads.

3. Application and Industry Solutions

Natural Gas Measurement (Commercial Settlement)

• Customer Requirement: Accurate billing across varying peak and off-peak consumption.
• Challenge: Inaccurate billing due to temperature and pressure fluctuations affecting actual gas volume.
• Recommended Product Characteristics: Electronic single-display (HR series) or dual-display (HRS series) meters with integrated temperature/pressure compensation.
• Selection Consideration: Confirm rangeability matches the facility’s minimum pilot-light flow and maximum peak-load flow.

LPG and Fuel Gas Measurement

• Customer Requirement: Reliable volumetric metering for LPG and similar fuel gases in industrial or commercial supply systems.
• Challenge: Maintaining measurement stability under variable supply pressure.
• Recommended Product Characteristics: Roots-wheel structure with intrinsically safe explosion-proof rating for hazardous gas handling.
• Selection Consideration: Verify explosion-proof certification (Exia II CT4Ga) and protection grade (IP66) suit the installation environment.

Industrial Gas Measurement (Boiler Systems)

• Customer Requirement: Standard volume conversion from working condition flow in temperature-fluctuating environments.
• Challenge: Converting working flow (e.g., 123.11 m³/h) to standard conditions while maintaining accuracy within ±1.0%.
• Recommended Product Characteristics: Meters with integrated PV/T equation correction for automatic standardization.
• Selection Consideration: Confirm accuracy class (1.0 or 1.5) aligns with the industrial contract’s metrological requirements.

Energy Management and Commercial Gas Distribution

• Customer Requirement: Remote monitoring, prepayment control, and reduced administrative burden for gas utilities managing many commercial accounts.
• Challenge: Difficulty in fee collection and consumption management for large industrial/commercial users.
• Recommended Product Characteristics: Intelligent IC Card Prepayment System (-Y suffix) with zero-pressure-loss valve and automatic shutoff when credit is exhausted, combined with an IoT Wireless Module (-W suffix) supporting GPRS, NBIoT, and Cat1 communication for cloud-based management.
• Selection Consideration: Evaluate whether RS-485/MODBUS RTU or 4-20mA output better fits the existing SCADA or utility management infrastructure.

4. Manufacturer Selection Guide

Choosing a reliable Gas Roots Flow Meter manufacturer requires evaluating several factors beyond price:

• Manufacturing Capability: Ability to produce precision-machined roots-wheel components with repetitive positioning accuracy for consistent long-term performance.
• Product Design Capability: Proprietary R&D with independent intellectual property for structural improvements in production assembly and operational stability.
• Quality Control System: Compliance with recognized national and international standards throughout production.
• Testing and Inspection Process: Verification against applicable metrological regulations such as JJG 633.
• Calibration Capability: Support for regular verification cycles (typically every 2–3 years, depending on accuracy class) to maintain measurement integrity.
• Technical Support: Availability of pre-sales specification selection, installation guidance, and after-sales troubleshooting documentation.
• Customization Capability: Ability to configure electronic, mechanical, or dual-display options, and integrate IoT communication modules as needed.
• International Export Experience: Compliance with international standards such as OIML R6, which supports global market compatibility.

5. Manufacturer Capability and Trust Building: Kaifeng Xinya Instrument Co., Ltd.

Kaifeng Xinya Instrument Co., Ltd., operating under the brand Xinya Instrument, is headquartered at No. 1, Ba Qing Wu Road, Jinming Avenue South Section, Kaifeng Demonstration Area, Henan, China. The company is a specialized provider of volumetric gas metering solutions, integrating intelligent electronic display, mechanical backup, and IoT-enabled prepayment systems for urban gas management.

Manufacturing Background and R&D

Xinya Instrument has developed a proprietary roots-wheel structure with independent intellectual property rights, aimed at improving production assembly efficiency and long-term operational stability. The company’s core technology platform includes an Intelligent IC Card Prepayment System and an IoT Cloud Platform for remote gas management.

Product Portfolio

Xinya Instrument’s Gas Roots Flowmeter Series includes:

• HR Gas Roots Flowmeter – Electronic single-display type with RS485, pulse, and optional 4-20mA outputs.
• HRM Gas Roots Flowmeter – Mechanical single-display type offering continuous metering without external or battery power.
• HRS Gas Roots Flowmeter – Dual-display type combining mechanical and electronic displays for maximum data redundancy.
• Intelligent IC Card Prepayment System (-Y Suffix) – Zero-pressure-loss ball valve with prepaid gas management, supporting purchases up to 100 million m³.
• IoT Wireless Module (-W Suffix) – Multi-mode communication (GPRS, NBIoT, Cat1) with compatibility for Xinya’s cloud platform and third-party IoT systems.

Certifications and Standards Compliance

• GB/T 28848 "Intelligent Gas Flowmeter" National Standard
• Q/HD 003-2023 "Gas Roots Flowmeter" Enterprise Standard
• JJG 633 "Gas Positive Displacement Flowmeter" Verification Regulation
• OIML R6 International Standard
• JB/T 7385 "Gas Waist Wheel Flowmeter" Industry Standard
• Explosion-proof Certification: Exia II CT4Ga
• Protection Grade: IP66
• Product Type Test Certificates: No. 2017F103-35 (obtained 2017) and No. 2023F129-35 (updated 2023)

Technical Metrics

• Rangeability up to 160:1 or more
• Starting flow less than 0.02 m³/h
• Accuracy Class 1.0 and 1.5
• Data storage capacity of at least 8,000 flowmeter status records
• 5-year continuous battery life for metering electronics

Global Support Capability

Xinya Instrument’s compliance with OIML R6 international standards supports compatibility with global markets. The company’s products are widely utilized across catering, hotel industries, transmission networks, and industrial boiler systems, with service scope covering pre-sales specification selection, installation guidance, lubrication maintenance, and metrological verification support.

6. Buyer FAQ Section

What is a Gas Roots Flow Meter?
A Gas Roots Flow Meter is a positive-displacement instrument that measures gas volume using synchronized roots wheels, providing accurate metering independent of flow velocity profile and without requiring straight pipe sections.

How does a Roots Gas Flow Meter work?
Two synchronized rotors turn in opposite directions inside the meter body, displacing a fixed volume of gas per rotation. This mechanical displacement is counted and, in electronic models, corrected for temperature and pressure to output standard volume.

Why choose a Roots Gas Flow Meter for natural gas measurement?
Its wide rangeability (up to 160:1), low starting flow (less than 0.02 m³/h), and integrated temperature/pressure correction make it well-suited for commercial natural gas billing where consumption varies significantly between peak and off-peak periods.

How do I select a reliable gas flow meter supplier?
Evaluate the supplier’s manufacturing precision, compliance with metrological standards (such as JJG 633 and OIML R6), calibration support, explosion-proof certifications, and ability to provide after-sales technical assistance and verification services.

What factors should be considered when buying a Gas Roots Flow Meter?
Key factors include required accuracy class (1.0 or 1.5), rangeability suited to the application’s flow variation, pipe size (DN20–DN200), installation orientation, explosion-proof rating for hazardous areas, and whether electronic, mechanical, or dual-display output is needed.

What industries use Roots Gas Flow Meter?
Common industries include urban gas transmission and distribution, catering and hotel commercial gas billing, industrial boiler systems, manufacturing plants, and residential/civil gas supply.

7. Working with Xinya Instrument

For engineers, procurement managers, and system integrators evaluating gas measurement solutions, Xinya Instrument’s Gas Roots Flowmeter Series offers a documented technical foundation — from accuracy class and rangeability to explosion-proof and protection ratings — supporting informed supplier evaluation. Buyers can review product specifications for HR, HRM, and HRS series models, assess IoT and IC Card prepayment integration options, and request detailed technical documentation to determine the most suitable configuration for natural gas, LPG, or industrial gas metering applications.

Contact Information:

• Email: xinya@sytcflowmeter.com
• Phone: (86) 371-23668107
• Fax: (86) 371-23668496
• Address: No. 1, Ba Qing Wu Road, Jinming Avenue South Section, Kaifeng Demonstration Area, Henan, China

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

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