1. Introduction: Understanding the Gas Roots Flow Meter and Its Industrial Role
A Gas Roots Flow Meter is a positive-displacement volumetric metering instrument built around a roots-wheel structure with synchronous gears. Unlike velocity-based meters, it captures gas volume directly as it rotates, which means measurement accuracy does not depend on the incoming flow profile and no straight pipe sections are required for installation. This structural independence makes the Roots Gas Flow Meter one of the most reliable choices for commercial and industrial gas settlement applications.
Accurate gas measurement matters because billing, safety, and process control all depend on it. In city gas networks, transmission pipelines, and industrial boiler rooms, even small metering errors compound into significant financial and operational discrepancies over time. Industries that routinely require precise gas flow measurement include:
- Urban gas distribution and transmission networks
- Catering and hotel commercial gas users
- Industrial boiler operations
- Civil/residential heating systems
- Chemical and industrial gas processing facilities
2. Gas Roots Flow Meter Product Overview
Working Principle
The meter uses two synchronized roots wheels rotating inside a precision-machined chamber. As gas passes through, it fills and discharges fixed-volume pockets between the wheels, and each rotation corresponds to a known gas volume. A microprocessor-based correction unit then applies real-time temperature and pressure compensation (using PV/T gas equation logic, referencing standards such as SY/T 6143-2004 or SGERG-88) to convert working-condition flow into standard volume.
Product Structure
- Roots-wheel measuring chamber with synchronous gears
- Mechanical counter and/or electronic LCD display (single or dual display configurations)
- Integrated or external temperature/pressure sensors
- Intrinsically safe electronic housing rated Exia II CT4Ga, IP66 protection
Measurement Characteristics
- Rangeability up to 160:1 or more
- Starting flow as low as 0.02 m³/h
- Accuracy class of 1.0 or 1.5
- 350° rotating meter head for flexible orientation
- Compatible with horizontal and vertical flange installation, DN20 to DN200
Technical Advantages
- No requirement for upstream/downstream straight pipe runs
- Low pressure loss due to volumetric design
- Wide rangeability suitable for both pilot-light-level and peak-load flows
- Dual mechanical-electronic display option for uninterrupted data continuity during power loss
Suitable Operating Conditions
Designed for non-corrosive gases including natural gas, city gas, propane, nitrogen, and carbon dioxide, in commercial, industrial, and transmission network settings.
Gas Roots Flow Meter vs. Other Gas Flow Meters
Compared to turbine or vortex gas flow meters, a Roots Type Gas Flow Meter offers higher accuracy at low flow rates and does not require long straight pipe sections, making it better suited for space-constrained commercial installations. Compared to simple mechanical meters without correction, an integrated Gas Roots Flow Meter with electronic compensation delivers standard-volume output automatically, removing manual calculation errors from commercial settlement.
3. Application and Industry Solutions
Natural Gas Measurement
Customer Requirement: Accurate volumetric billing across fluctuating pressure and temperature conditions.
Challenge: Manual correction leads to billing disputes.
Recommended Characteristics: Integrated temperature/pressure compensation, RS485/pulse/4-20mA signal outputs.
Selection Consideration: Choose accuracy class 1.0 for commercial settlement precision.
LPG and Fuel Gas Measurement
Customer Requirement: Reliable metering of non-corrosive fuel gases in catering and hotel operations.
Challenge: Wide swings between pilot-level and peak cooking loads.
Recommended Characteristics: Wide rangeability (up to 160:1) and low starting flow (0.02 m³/h) to capture both extremes.
Selection Consideration: Confirm flange size (DN20–DN200) matches existing pipe infrastructure.
Industrial Gas Measurement
Customer Requirement: Consistent standard-volume conversion in temperature-fluctuating industrial boiler environments.
Challenge: Working condition flow varies with ambient and process temperature.
Recommended Characteristics: Integrated PV/T equation correction and intrinsically safe design for hazardous areas.
Selection Consideration: Verify explosion-proof rating (Exia II CT4Ga) and IP66 protection for site conditions.
Energy Management and Commercial Gas Distribution
Customer Requirement: Prepaid gas control and remote monitoring for multi-tenant or commercial facilities.
Challenge: Manual fee collection and lack of remote visibility into consumption.
Recommended Characteristics: IC Card Prepayment System with zero-pressure-loss valve, and IoT Wireless Module supporting GPRS, Cat1, or NBIoT connectivity.
Selection Consideration: Evaluate cloud platform compatibility and remote valve control capability.
4. Manufacturer Selection Guide: How to Choose a Reliable Gas Roots Flow Meter Manufacturer
Buyers evaluating a Gas Roots Flow Meter Supplier should assess the following factors:
- Manufacturing Capability: Precision machining and repetitive positioning technology for consistent long-term performance.
- Product Design Capability: Proprietary structural design with independent intellectual property, improving assembly stability and product versatility.
- Quality Control System: Enterprise standards aligned with recognized national and international regulations.
- Testing and Inspection Process: Type testing under recognized certification programs to validate metrological performance.
- Calibration Capability: Compliance with verification regulations governing gas positive-displacement flowmeters.
- Technical Support: Pre-sales specification guidance, installation support, and troubleshooting documentation.
- Customization Capability: Configurable display types (electronic, mechanical, or dual), communication protocols, and prepayment modules.
- International Export Experience: Compliance with international metrology standards to support cross-border deployment.
5. Manufacturer Capability and Trust: Kaifeng Xinya Instrument Co., Ltd.
Kaifeng Xinya Instrument Co., Ltd., operating under the Xinya Instrument brand, is headquartered at No. 1, Ba Qing Wu Road, Jinming Avenue South Section, Kaifeng Demonstration Area, Henan, China. The company is positioned as 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 and long-term stability. The company’s technology platform includes an Intelligent IC Card Prepayment System and an IoT Cloud Platform for remote gas management.
Certifications and Standards Compliance
- GB/T 28848 "Intelligent Gas Flowmeter" National Standard Compliance
- 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)
Product Portfolio
- HR Gas Roots Flowmeter — electronic single display, integrated temperature/pressure correction
- HRM Gas Roots Flowmeter — mechanical single display, power-independent counter
- HRS Gas Roots Flowmeter — dual mechanical-electronic display for data redundancy
- Intelligent IC Card Prepayment System (-Y Suffix) — zero-pressure-loss prepayment valve control
- IoT Wireless Module (-W Suffix) — GPRS/NBIoT/Cat1 remote monitoring and cloud integration
Global Support Capability
Xinya Instrument’s product line complies with OIML R6 international standards, supporting compatibility with global gas measurement markets. Products are widely utilized across catering, hotel industries, transmission networks, and industrial boiler systems, with service offerings covering pre-sales specification selection, installation guidance, lubrication maintenance, and metrological verification.
6. Buyer FAQ
What is a Gas Roots Flow Meter?
It is a positive-displacement instrument that uses synchronized roots wheels to measure gas volume directly, independent of the flow profile, commonly used for commercial and industrial gas billing.
How does a Roots Gas Flow Meter work?
Two synchronized roots wheels rotate as gas passes through fixed-volume chambers; each rotation represents a known gas volume, which is then converted to standard conditions using temperature and pressure compensation.
Why choose a Roots Gas Flow Meter for natural gas measurement?
Its wide rangeability (up to 160:1), low starting flow (0.02 m³/h), and integrated temperature/pressure correction make it well suited for accurate commercial settlement under varying load conditions.
How do I select a reliable gas flow meter supplier?
Evaluate manufacturing precision, compliance with recognized standards (such as GB/T 28848, JJG 633, and OIML R6), type test certification history, calibration capability, and technical support scope.
What factors should be considered when buying a Gas Roots Flow Meter?
Key factors include accuracy class, rangeability, flange size (DN20–DN200), display type (electronic, mechanical, or dual), explosion-proof rating, protection grade, and whether prepayment or IoT connectivity is required.
What industries use Roots Gas Flow Meter equipment?
Common industries include urban gas transmission and distribution, catering and hotel operations, industrial boiler systems, and civil/residential heating applications.
7. Next Steps for Buyers
Engineers, procurement managers, and system integrators evaluating a Gas Roots Flow Meter Manufacturer for natural gas, LPG, or industrial gas measurement projects can request detailed product specifications, discuss customized configurations (display type, communication protocol, or prepayment module), and contact Xinya Instrument’s technical team for application-specific guidance.
Contact Xinya Instrument:
- 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.