Gas Roots Flow Meter Manufacturer: A 2026 Buyer’s Guide

1. What Is a Gas Roots Flow Meter and Why It Matters

A Gas Roots Flow Meter (also called a Roots Type Gas Flow Meter or Rotary Gas Flow Meter) is a positive displacement instrument that measures the volumetric flow of non-corrosive gases—such as natural gas, city gas, propane, nitrogen, and carbon dioxide—using a pair of synchronized roots-wheel rotors. As gas passes through the meter body, the rotors turn in fixed volumetric increments, allowing the instrument to calculate flow volume with high repeatability regardless of the upstream flow profile.

Accurate gas measurement is critical because commercial and industrial gas billing, safety monitoring, and network balancing all depend on precise volumetric data. Small measurement errors can accumulate into significant financial discrepancies for utilities and large-volume users. Roots-type meters are widely selected because they do not require straight pipe sections for installation, making them practical for space-constrained gas rooms and retrofit projects.

Industries that commonly require gas flow measurement include:

• Urban gas distribution networks
• Catering and hotel commercial kitchens
• Industrial boiler operations
• Chemical and industrial gas users
• Civil/residential boiler systems

2. Gas Roots Flow Meter Product Overview

Working Principle
The meter uses two roots-wheel rotors connected by synchronous gears. Gas entering the measuring chamber rotates the wheels, and each rotation corresponds to a fixed volume of gas passed. A microprocessor-based volume correction instrument then applies real-time temperature and pressure compensation using the PV/T gas equation (referencing SY/T 6143-2004 or SGERG-88 compression factor standards) to convert working condition flow into standard volume.

Structure and Measurement Characteristics

• Roots-wheel structure with synchronous gears for flow-profile-independent accuracy
• 350° rotating meter head for flexible orientation
• Supports both horizontal and vertical installation
• Flange connection sizes from DN20 to DN200
• Rangeability up to 160:1 or more
• Starting flow as low as 0.02 m³/h
• Accuracy class of 1.0 or 1.5

Technical Advantages

• Minimal pressure loss compared to differential-pressure-based meters
• No need for long straight pipe runs before/after installation
• Intrinsically safe electrical design (Exia II CT4Ga) for hazardous locations
• IP66 protection grade for outdoor and humid environments
• Wide rangeability that captures both low pilot-light flows and high peak loads

Suitable Operating Conditions
Roots-type gas meters are best suited for clean, non-corrosive gas streams in commercial, industrial, and civil gas supply networks where consistent volumetric accuracy across variable flow rates is required.

Roots Meter vs. Other Gas Flow Meter Types
Unlike turbine or vortex gas flow meters that depend heavily on stable flow profiles and straight-pipe conditions, roots-type gas flow meters deliver stable accuracy even under pulsating or variable flow. Compared to purely mechanical meters, roots meters with integrated electronic correction (such as the HR series) eliminate manual conversion errors by directly outputting standard volume.

3. Application and Industry Solutions

Natural Gas Measurement
Utilities require accurate commercial settlement across fluctuating peak and off-peak loads. A wide rangeability meter with automatic temperature/pressure compensation ensures billing accuracy without manual correction. Selection consideration: choose a meter with sufficient rangeability to cover both pilot-light-level and peak-load flow rates.

LPG and Fuel Gas Measurement
Fuel gas suppliers need reliable volumetric metering for propane and similar gases with minimal pressure loss to preserve downstream appliance performance. Recommended product characteristic: intrinsically safe explosion-proof design (Exia II CT4Ga) for safe operation in gas-rich environments.

Industrial Gas Measurement
Chemical and industrial gas users measuring nitrogen or carbon dioxide streams require robust mechanical construction and stable accuracy under continuous operation. Selection consideration: mechanical backup display (as in the HRS series) protects data continuity during power interruptions.

Energy Management and Commercial Gas Distribution
Property managers and gas utilities managing prepaid commercial accounts need integrated financial control. An IC card prepayment system with a zero-pressure-loss ball valve allows automatic supply cutoff when credit is exhausted, addressing collection and management challenges for large commercial or industrial accounts.

4. Manufacturer Selection Guide

When evaluating a Gas Roots Flow Meter manufacturer or supplier, international buyers should assess:

• Manufacturing Capability: Does the factory hold proprietary structural design and independent intellectual property for production consistency?
• Product Design Capability: Can the manufacturer offer multiple display configurations (electronic-only, mechanical-only, or dual display) to match different reliability requirements?
• Quality Control System: Is there an enterprise standard governing product specifications, such as a documented internal quality standard for roots flowmeters?
• Testing and Inspection Process: Has the product passed recognized type testing, and is there a valid type test certificate?
• Calibration Capability: Does the manufacturer support metrological verification aligned with recognized verification regulations for positive displacement gas meters?
• Technical Support: Is pre-sales specification selection, installation guidance, and after-sales troubleshooting documentation available?
• Customization Capability: Can the supplier configure communication protocols (RS-485/MODBUS RTU, 4-20mA, GPRS/Cat1/NBIoT) and prepayment features to match specific network requirements?
• International Export Experience: Does the manufacturer’s product line comply with internationally recognized measurement standards (such as OIML R6) suitable for global market entry?

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 specializes in volumetric gas metering solutions that integrate intelligent electronic display, mechanical backup, and IoT-enabled prepayment systems for urban gas management.

Technical and R&D Background
Xinya Instrument has developed a roots-wheel structure with independent intellectual property rights, designed to improve production assembly consistency and long-term operational stability. The company’s technology platform includes an Intelligent IC Card Prepayment System and an IoT Cloud Platform supporting remote gas network management.

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 and No. 2023F129-35

Product Portfolio

• HR Gas Roots Flowmeter — electronic single display with integrated temperature/pressure correction
• HRM Gas Roots Flowmeter — mechanical single display for power-independent metering
• HRS Gas Roots Flowmeter — dual mechanical/electronic display for maximum data redundancy
• Intelligent IC Card Prepayment System (-Y Suffix) — supports gas purchases up to 100 million m³
• IoT Wireless Module (-W Suffix) — GPRS, Cat1, and NBIoT connectivity with cloud platform integration

Service and Support Capability
Xinya Instrument’s service model combines hardware sales with IoT cloud platform subscription and IC card management. Support scope includes pre-sales specification selection, installation guidance, lubrication maintenance, and metrological verification, backed by a 5-year continuous battery life for metering electronics and remote valve control via IoT modules.

6. Buyer FAQ

What is a Gas Roots Flow Meter?
A Gas Roots Flow Meter is a positive displacement instrument that measures gas volume using synchronized roots-wheel rotors, commonly used for natural gas, LPG, and industrial gas metering.

How does a Roots Gas Flow Meter work?
Gas flow rotates two synchronized roots wheels inside the meter chamber; each rotation represents a known volume. Integrated electronics can apply temperature and pressure compensation to convert this into standard volume.

Why choose a Roots Gas Flow Meter for natural gas measurement?
Roots-type meters offer wide rangeability (up to 160:1), low starting flow (as low as 0.02 m³/h), and stable accuracy without requiring long straight pipe sections, making them well-suited for variable commercial and utility gas loads.

How do I select a reliable gas flow meter supplier?
Evaluate the supplier’s compliance with recognized standards (such as GB/T 28848, JJG 633, or OIML R6), availability of type test certificates, proprietary product design, and after-sales technical support capability.

What factors should be considered when buying a Gas Roots Flow Meter?
Key factors include required rangeability and accuracy class, pipe diameter (DN20–DN200), display type (electronic, mechanical, or dual), explosion-proof rating for hazardous areas, and communication protocol needs (RS-485/MODBUS RTU, 4-20mA, or IoT connectivity).

What industries use Roots Gas Flow Meter equipment?
Common industries include urban gas transmission and distribution, catering and hotel gas billing, industrial boiler operations, chemical/industrial gas use, and civil/residential boiler systems.

Next Steps for International Buyers

For engineers, procurement managers, and system integrators evaluating a Gas Roots Flow Meter Manufacturer for natural gas, LPG, or industrial gas measurement projects, Xinya Instrument’s product range—spanning the HR, HRM, and HRS series along with IC card prepayment and IoT wireless modules—provides configurable solutions for commercial, industrial, and utility-scale gas networks.

To request a detailed product specification sheet, discuss customization of communication protocols or prepayment features, or obtain a quotation, buyers can contact Xinya Instrument directly:

• 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