Available Available for application review, project configuration and quotation through Blue Dragon Technology
Blue Dragon BDT Flow Measurement Series
FF1225-A

Lauris FF1225-A Single-Path Inline Ultrasonic Gas Flow Meter

Single-path axial ultrasonic gas-flow measurement across exceptionally wide flow ranges, including low-velocity, wet, dirty and variable-composition gas streams.

Brand: Lauris Technologies Manufactured by: Lauris Technologies, Canada Supply & support: Blue Dragon Technology
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Product Overview

Purpose-built measurement, clearly presented.

The Lauris FF1225-A is a single-path inline ultrasonic gas flow meter engineered for accurate measurement of low-velocity and highly variable industrial gas streams. Its applications include flare gas, vent gas, associated gas, flue gas, natural gas, blended gases and other process streams where wide rangeability and tolerance to gas impurities are required.

The meter uses wetted ultrasonic transducers arranged along an axial acoustic path. Available configurations include different spool materials, pressure classes, transducer materials, local or remote electronics, pressure and temperature inputs, hazardous-area approvals and project-specific process connections.

Distinctive Capabilities

  • Minimum detectable gas velocity down to 0.01 m/s
  • Measurement of wet, dirty and variable-composition gas streams
  • Tolerance to liquid carryover, dust and process contaminants
  • No moving measurement components
  • Very low permanent pressure loss
  • Measurement under negative-pressure conditions
Performance & Technical Data

The measurement method and the values that matter.

How it measures

Measurement Principle

Two ultrasonic transducers alternately transmit acoustic pulses with and against the direction of gas flow. The flowing gas causes a measurable difference between the downstream and upstream transit times. Lauris signal processing uses this time difference to calculate average gas velocity and volumetric flow. The axial acoustic arrangement increases the effective measurement path and supports reliable measurement at very low gas velocities. Pressure and temperature inputs can be used to calculate corrected flow values, while acoustic information can also support molar-mass and related gas-property calculations.

Repeatability0.1%
Process Temperature-190°C to +250°C
Meter typeWetted, non-intrusive inline ultrasonic gas flow meter
Operating principleAxial ultrasonic transit-time measurement with proprietary signal processing
Acoustic pathsSingle path with two transducers
Velocity range0.01 to 150 m/s

Complete Technical Data

Published accuracy
±1.0% to ±2.5%; final performance is configuration and application dependent
Turndown ratio
8,000:1
Pipe diameter
0.04 to 5 m (1.5 to 200 in)
Recommended straight run
10 pipe diameters upstream and 5 pipe diameters downstream
Process pressure
0.1 to 400 bar absolute
Negative-pressure operation
Available; application configuration must be confirmed
Liquid carryover
Current Lauris cutsheet states that the presence of liquids does not affect flow measurement; actual liquid loading must be reviewed
Gas-density capability
Published from 0.05 kg/m³; suitable for low-density gases including hydrogen
Transducer materials
SS316, SS316L, titanium, Hastelloy or Monel
Transducer cable length
Up to 30 m
Process connection
NPT or flanged transducer connections; standard configuration uses 1.5 in connections
Transducer servicing
Online-retractable arrangement available for removal under pressure
Measured and calculated parameters
Standard flow, actual flow, flow rate, totalized flow, molar mass, pressure and temperature
Power Supply
24 VDC nominal, 20 to 32 VDC; 120 or 220 VAC optional
Power consumption
2.5 W maximum
Analogue inputs
Two 4–20 mA inputs for pressure and temperature
Standard outputs
Modbus, frequency or pulse, one 4–20 mA output and HART
Optional analogue outputs
Up to twelve 4–20 mA outputs
Transmitter enclosure
Die-cast aluminum or stainless steel
Ingress protection
NEMA 4X and IP67
Hazardous-area approvals
CSA or UL Class I, Division 1, Groups B, C and D, T4; ATEX Zone 1; IECEx Zone 1, subject to ordered configuration
Sunshade
GRP or stainless-steel sunshade available
Availability
Available for application review and quotation
Development notice

Published ranges and approvals are configuration dependent. Final sizing, materials, performance, calibration and certification are confirmed during application review.

Industrial Use

Applications and industries.

Typical Applications

Flare-gas flow measurementVent-gas and relief-system monitoringAssociated-gas measurementFlue-gas and combustion-exhaust measurementNatural-gas and blended-gas flowHydrogen and low-density gas measurementProcess-gas and fuel-gas measurementBiogas and renewable-gas measurementStorage-tank vent and vapor-recovery systemsEnvironmental emissions reportingAllocation measurementFiscal or custody-transfer applications subject to selected configuration and calibrationCustody-Transfer / Fiscal Gas MeteringFlare Gas Flow MeasurementHydrogen / Low-Density Gas FlowIndustrial Gas Flow MeasurementLow-Velocity Gas Flow MeasurementNatural Gas Flow MeasurementProcess Gas Flow MeasurementWet / Dirty Gas Flow Measurement

Industries Served

Biogas & Renewable GasChemical ProcessingCoal & Coal ChemicalEnvironmental Monitoring & ComplianceHydrogen & SyngasNatural Gas & LNGOil & GasPetrochemicalsPipelines & MidstreamPower GenerationRefining
Engineering & Integration

Built for specification, installation, and long-term operation.

Application engineering defines the acoustic-path configuration, meter-body dimensions, process materials, pressure class, transducer metallurgy, electronics location, pressure and temperature compensation, output signals, hazardous-area approvals and installation geometry required for the gas service.

Meter architectureSingle-path inline axial ultrasonic meter
Published velocity range0.01 to 150 m/s
Process interfaceComplete flow spool or transducers engineered into the process pipe
Configuration basisPipe, gas, pressure, temperature, accuracy and certification requirements

Meter Configuration

  • StandardSingle axial acoustic path using two wetted ultrasonic transducers and an FF1225 flow transmitter.
  • OptionalLocal integral transmitter or remote transmitter with 10 m, 20 m or 30 m coaxial cables.
  • OptionalPressure and temperature transmitters, isolation valves, remote mounting hardware, stainless-steel transmitter enclosure and sunshade.
  • Project Engineeredmeter-body diameter and length; pipe schedule; flange standard and pressure class; spool and transducer materials; local or remote transmitter; cable length; retractable transducers; pressure and temperature inputs; analogue, pulse, HART and Modbus outputs; enclosure material; sunshade; hazardous-area approvals; calibration and documentation package.

Transducer & Pipe Interface

  • StandardThe gas is measured directly within the process pipe. No extracted sample, sample conditioning system, bypass loop or carrier gas is required.
  • Project EngineeredThe meter spool, transducer ports and acoustic path are sized for the internal pipe diameter and required velocity range.
  • Application DependentGas composition, molecular weight, liquid loading, solids, pressure, temperature, acoustic attenuation and expected velocity profile must be reviewed during sizing.

Installation Geometry & Utilities

  • StandardInstall with approximately 10 pipe diameters of straight run upstream and 5 pipe diameters downstream unless Lauris approves another arrangement.
  • Project EngineeredConfirm pipe orientation, internal diameter, schedule, flange class, spool length, available access, transmitter mounting position and cable route.
  • OptionalOnline-retractable transducers can be supplied for servicing under pressure when the required ports, isolation valves and retraction equipment are included.
  • StandardNominal transmitter supply is 24 VDC, with AC supply available as an option.

Communications & Integration

  • StandardModbus, frequency or pulse, one 4–20 mA output and HART are available from the transmitter.
  • OptionalUp to twelve 4–20 mA outputs can be provided for additional measured or calculated variables.
  • OptionalTwo 4–20 mA inputs can accept external pressure and temperature transmitter signals.
  • Project EngineeredDCS, PLC or SCADA integration must define engineering units, standard-flow reference conditions, pulse scaling, Modbus mapping, alarm functions, totalizer handling and communication architecture.

Verification & Calibration

  • Application DependentThe required calibration method, uncertainty statement, calibration range, gas conditions and certificate package must be defined during quotation.
  • StandardManufacturing records should identify the paired transducers, meter dimensions, material selections, transmitter configuration and channel assignments.
  • StandardCommissioning should verify zero-flow behavior, pressure and temperature inputs, output scaling, totalizer operation, communication mapping and agreement with the configured pipe dimensions.

Maintenance & Service

  • StandardPeriodic inspection should assess transducer condition, contamination, cable integrity, process seals, transmitter enclosure, terminal connections and diagnostic signal quality.
  • OptionalRetractable transducers can be inspected or replaced under pressure when the approved isolation and retraction system is included.
  • Application DependentInspection frequency depends on liquid loading, solids, corrosion, gas composition, operating temperature, pressure cycling and the criticality of the measurement.

Application Limits & Environmental Rating

  • Project EngineeredThe pressure-containing meter body, flanges, process ports, valves and transducers must match the design pressure, design temperature, piping class and material specification.
  • Application DependentHazardous-area approval must be selected for the site classification and verified against the exact transmitter, enclosure and electrical configuration supplied.
  • Application DependentUnder-pressure transducer removal requires the correct isolation valves, retraction equipment, trained personnel and an approved operating procedure.
  • Project EngineeredCorrosive gases, hydrogen service, sour-gas service, low-temperature service and high-pressure service require an appropriate material and compatibility review.
Application Review

Application Engineering Notes

Application information

Meter selection requires the pipe size, schedule and internal diameter; flange standard and class; operating and design pressure and temperature; minimum, normal and maximum flow; expected gas velocity; gas composition, molecular weight and density; moisture, liquid and solids content; standard-flow reference conditions; accuracy requirement; transmitter location; available power; outputs; hazardous-area classification; and certification requirements.

Confirmed configuration

Published platform values are configuration dependent. Final pressure and temperature limits, materials, enclosure protection, outputs, calibration, and certification are confirmed in the approved quotation and project datasheet.

Project Delivery

Project Integration & Support Scope

Blue Dragon reviews the measurement objective, interfaces, documentation, commissioning, and lifecycle requirements as part of project configuration. The scope below identifies the principal items to confirm before order placement.

Measurement Objective
Single-path inline ultrasonic gas-flow measurement for flare gas, vent gas, associated gas, flue gas, natural gas, hydrogen, and approved industrial process-gas applications across a wide velocity range.
Signal Outputs
Standard transmitter outputs include Modbus, frequency or pulse, one 4-20 mA output, and HART. Up to twelve 4-20 mA outputs and two 4-20 mA pressure or temperature inputs are optional.
Data Integration
DCS, PLC, SCADA, flow-computer, historian, or emissions-system integration must define engineering units, standard-flow reference conditions, pulse scaling, totalizer behavior, Modbus mapping, pressure and temperature inputs, alarms, and communication architecture.
Alarms & Diagnostics
Transmitter diagnostics can support acoustic-signal, transducer, input, output, and communication status. Alarm functions and fail-safe handling are project configured according to the measurement objective.
Documentation
The package may include the product sheet, approved meter and spool drawings, material and transducer records, calibration or test certificates, pressure-boundary documents, wiring and I/O details, hazardous-area certificates, and commissioning records as ordered.
Commissioning Support
Commissioning can include dimensional and installation verification, zero-flow behavior, acoustic signal quality, pressure and temperature inputs, output scaling, pulse and totalizer checks, Modbus or HART mapping, and comparison with the approved configuration.
Lifecycle Support
Lifecycle support covers transducers, cables, process seals, transmitter enclosure and terminals, diagnostic review, contamination inspection, retractable assemblies where supplied, calibration guidance, spare parts, troubleshooting, and repairs.
Technical Resources

Product Documents

Product Sheet first, followed by the Brochure, Manual, and any additional technical documents.

Application Engineering

Discuss your measurement application.

Share the sample, measurement range, operating conditions, project location, and timeline. Blue Dragon Technology will review the application and recommend the appropriate configuration.

Discuss Your Application Request a Quote Request Product Information
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