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Multivariable Vortex Flowmeter

Single instrument measures flow, temperature, and pressure—delivering compensated mass flow without external transmitters or flow computers for steam, natural gas, and compressed air applications.
Integrated flow, temperature, and pressure measurement in one device—on-board compensation calculations deliver accurate mass flow and standard volume for steam, natural gas, compressed air, and industrial gases without external flow computers. Replaces three separate instruments with single installation point, reducing equipment costs by 40-50% while eliminating signal transmission errors in energy management and process control applications.
  • ±1.5-2.0% mass flow (eliminates multi-instrument error propagation)
  • Three measurements in one device (flow + temperature + pressure)
  • Real-time on-board compensation (no external flow computer)
  • Single process penetration, faster commissioning
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Consolidated 3-in-1 Sensor Architecture

Replaces separate flow, temperature, and pressure transmitters with a single integrated device. This reduces your hardware bill-of-materials and simplifies instrument inventory management.

Advanced Dynamic Filtering (DSP)

Utilizes proprietary Digital Signal Processing (DSP) to isolate the flow signal from mechanical noise and pipe vibration, ensuring unshakeable accuracy even in “heavy” industrial environments.

Real-Time Mass-Flow Correction

The integrated flow computer performs live density compensation using real-time temperature and pressure data. You receive standardized mass-flow output immediately, eliminating the need for post-processing or external math.

Maintenance-Free Solid-State Build

Engineered with a rugged 316L stainless steel body and no moving parts. This non-contact sensor design prevents mechanical wear and extends calibration intervals, lowering your total cost of ownership.

Extreme Temperature Capability

Specially hardened sensors thrive in process environments ranging from -40°C to +450°C without mechanical degradation or measurement drift.

Multi-Variable Digital System Visibility

Transmits all three process variables (T, P, and Flow) through a single HART or Modbus-RS485 loop. This reduces wiring complexity while providing the control room with deep process diagnostic insights.

10-Year Permanent Data Security

Equipped with internal non-volatile EEPROM memory that serves as a secure vault for your data. Configuration settings and totalized mass flow records remain safe for a decade, even during total power failure.

Parameter
Specification
Measurement Principle
Vortex shedding with integrated T&P sensors
Measured Variables
Volumetric flow + Temperature + Pressure (3 simultaneous measurements)
Pipe Size Range
DN15 – DN300 (½" – 12")
Volumetric Flow Accuracy
±1.0% of reading (liquid), ±1.5% of reading (gas/steam)
Mass Flow Accuracy
±1.5% to ±2.0% (including compensation calculation)
Repeatability
±0.2% of reading
Rangeability
1:10 to 1:20 (application dependent)
Velocity Range
0.3 – 12 m/s (liquid), 3 – 80 m/s (gas/steam)
Temperature Measurement
-40°C to +400°C
Temperature Accuracy
±0.5°C (RTD Class A or better)
Pressure Measurement
Vacuum to 4.0 MPa (0-580 psi)
Pressure Accuracy
±0.1% of span (ceramic or piezoresistive sensor)
Body Material
304 SS, 316L SS (standard)
Vortex Shedder
316L SS (welded construction)
Process Connection
Flanged (ANSI/DIN), wafer, threaded (small sizes)
Compensation Method
On-board microprocessor with steam tables (IAPWS-IF97) or gas equations (AGA-8, ISO 12213)
Calculated Outputs
Mass flow (kg/h, lb/h), standard volume (Nm³/h, SCFM), energy (kW, MBtu/h for steam)
Power Supply
24V DC (standard), 12-36V DC, 85-265V AC (optional)
Output Signals
4-20mA (3 channels: flow, temperature, pressure), Pulse, Relay
Communication
RS485 Modbus, HART, Profibus DP, Foundation Fieldbus (optional)
Display
LCD or OLED: mass flow, volumetric flow, T&P values, totals, diagnostics
Data Logging
10,000+ records with timestamps
Protection Rating
IP65 (standard), IP67 (optional), Ex d IIB+H2 (hazardous area)
Quality Certifications
CE

Why Choose Multivariable Over Traditional Three-Instrument Setup

  • Traditional Setup (3 Separate Instruments):

    • Vortex flowmeter (volumetric only)
    • Temperature transmitter (separate RTD + transmitter)
    • Pressure transmitter (separate transducer + transmitter)
    • Flow computer (external, performs compensation calculations)
    • Multiple process penetrations, wiring runs, communication networks

  • Multivariable Advantage:

    Equipment Cost:

    • 40-50% lower total installed cost
    • Single spare parts inventory
    • One calibration certificate

  • Cost Efficiency:

    • 30-40% lower equipment cost
    • Faster installation (45-60 minutes vs. 2-3 hours)
    • Lower shipping costs due to reduced weight

  • Installation:

    • One process penetration vs. three
    • Single wiring run to control system
    • 60% faster installation time
    • Reduced piping and fittings

  • Accuracy:

    • No signal transmission errors between instruments
    • Measurements synchronized (same location, same time)
    • No A/D conversion losses

  • Maintenance:

    • Single device to troubleshoot
    • Unified diagnostics interface
    • One firmware to update
    • Skid-mounted or modular equipment

  • When to Use Traditional Setup:

    • Existing separate instruments already installed
    • Custody transfer requiring separate certified instruments
    • Redundant measurement strategy (backup instruments)
    • Extreme conditions exceeding multivariable sensor limits

    • Multivariable Measurement Across Energy-Intensive Industries

    Integrated compensation delivers accurate mass flow for steam, gas, and compressed air applications

    • Mass-Flow Steam Monitoring

      he definitive solution for industrial boiler rooms and thermal power plants. The multivariable sensor captures the fluctuating density of saturated and superheated steam, providing the mass-flow data essential for optimizing fuel-to-steam ratios.

    • Compressed Air Audit & Leak Detection

      Identify high-cost energy waste by monitoring factory-wide air distribution. The 1:30 range ratio allows the meter to accurately track high-velocity production air while detecting low-velocity nighttime leaks.

    • Chemical & Petrochemical Processing

      Safely manages the measurement of Nitrogen (N2), Argon (Ar), and volatile fuel gases. Featuring 316L stainless steel and Exd II CT2-T5 explosion-proof ratings, it ensures maximum safety in hazardous environments.

    • LPG and Natural Gas Sub-metering

      Designed for commercial and industrial park sub-metering where pressure fluctuations are common. The integrated pressure compensation ensures that tenants are billed fairly based on the actual mass of gas consumed.

    • Industrial Furnace & Boiler Control

      Optimizes the Air-to-Fuel ratio in large furnaces. By providing mass-flow data for fuel gases, the system allows for real-time adjustments to combustion, leading to higher product quality and lower emissions.

    Precision Gas Flow Measurement Starts Here

    Optimize your sanitary gas applications with accurate, maintenance-free thermal mass flow measurement. Contact our engineers today to configure the right tri-clamp solution for your system.
    info@hbmeter.cc
    (+86) 152-3780-0315
    1 Jingsan North Road, Xiangfu District, Kaifeng, Henan 475004 China

    About HBmeter

    AFT Instruments is a high-tech manufacturer delivering precision flow instrumentation for water, chemical, power, industrial automation, and process industries.
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    info@hbmeter.cc
    (+86) 152-3780-0315
    (+86) 152-3780-0315

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