Accredited air calibration facility for flow meters

Get accredited air and other gaseous flow meter calibration with traceable results from 65 to 25,000 m³/h for manufacturers, utilities and verification bodies.

Our Bulderbaan facility supports flow meter manufacturers, utilities, and industrial operators who require traceable verification, control, and recalibration of volume, mass, and differential pressure meters using atmospheric air.

Documentation of measurement accuracy

The need typically arises when meters must be validated for custody transfer, regulatory acceptance or process optimisation across wide operating ranges. Uncertainty in flow accuracy, pressure compensation or thermal correction can delay approvals, disrupt commercial settlements and increase compliance risk.

Results provide traceable reference measurements and documented uncertainty, supporting regulatory documentation, verification processes and operational decisions.

The image shows a test engineer operating the test setup at our air calibration facility for flow meter testing. — Our air calibration facility for flow meter testing provides documented measurement uncertainty and international traceability.

Target group and benefits

Get traceable air and gas flow calibration for regulatory and operational cases

We serve manufacturers of ultrasonic, turbine, swirl, coriolis and differential pressure meters, as well as utilities and industrial operators responsible for custody transfer and process measurement. Calibration is required when new meters are introduced into operation, when installed meters must be verified, or when periodic recalibration is mandated by regulation or contract.

Calibration certificates include full uncertainty documentation and are traceable to international standards. This ensures measurement consistency for national and international applications. The documented results are used in practice to confirm meter performance, adjust deviation where necessary and provide defensible evidence in regulatory audits and commercial settlements.

Book accredited air flow calibration

Arrange accredited calibration of air or gas flow meters in the Bulderbaan facility to obtain traceable documentation and internationally recognised results. Contact us to plan capacity, flow range and documentation requirements.

Use cases

Validate air and gas flow meters to support regulatory approval, operational accuracy and documented traceability.

Verification of flow accuracy

Determine deviation between indicated and reference flow across 65–25,000 m³/h to document performance for regulatory approval, custody transfer and internal quality assurance.

Meter adjustment and performance validation

Support adjustment using linear, polynomial or point-to-point correction methods and document resulting performance for acceptance and release decisions.

Accredited calibration with documented traceability

Provide calibration under BIPM approval and DANAK accreditation Reg. No. 9 with documented uncertainty of 0.23 %, supporting supporting international traceability of calibration results.

Facility specifications

Controlled atmospheric air calibration from 65 to 25,000 m³/h with traceable reference standards and documented uncertainty supporting compliance decisions.

Calibration range 65–25,000 m³/h

Covers low to very high air flow rates, enabling calibration of meters used in industrial processes, energy systems and custody transfer applications.

Relative expanded uncertainty 0.23 %

Supports high-accuracy calibration requirements and provides documented uncertainty for regulatory documentation and contractual verification.

5 reference lines and measuring line

Parallel working standards allow stable comparison between the meter under test and traceable references under controlled atmospheric conditions.

Suction principle operation

Ensures controlled air movement through the meter under test and reference standards, supporting repeatable and reproducible measurement results.

Signal compatibility

Supports pulse, analogue and mA output signals, enabling calibration of diverse meter technologies and documentation of electronic signal performance.

Temperature control 20 °C ± 5 °C

Maintains defined atmospheric conditions in line with BIPM approval scope, ensuring comparability and traceability of calibration results.

Facility setup

Configure air flow distribution, reference selection and correction systems to match meter size, flow range and documentation requirements.

Dual blower configuration

Two RPM-controlled centrifugal blowers enable stable air flow generation across the full calibration range and support flexible operation of reference lines.

Selectable reference lines

Five working standards can operate individually or in parallel, allowing calibration to be matched to meter size and required flow range.

Flow distribution control

Butterfly valves distribute air flow to selected reference strings, supporting precise configuration of calibration conditions.

Measurement correction system

Thermistors and differential pressure transmitters measure deviations between reference standards and the meter under test, enabling correction for thermal and pressure differences.

Conditioning before calibration

Meters and working standards are stabilised prior to testing to ensure temperature and pressure equilibrium, supporting reliable comparison at each flow point.

Standards

BIPM approval and DANAK accreditation Reg. No. 9 ensure internationally traceable air flow calibration for compliance, documentation and regulatory acceptance.

BIPM approval for air flow calibration

The facility operates under approval from the Bureau International des Poids et Mesures for calibration of air flowrate in the range 65–25,000 m³/h with a relative expanded uncertainty of 0.23 %. This approval ensures international recognition of measurement capability and supports cross-border acceptance of calibration results in regulated applications.

DANAK accreditation Reg. No. 9

Calibration activities are performed under DANAK accreditation Reg. No. 9, confirming that the facility operates in accordance with ISO/IEC 17025 requirements. Accreditation ensures documented competence, controlled procedures and traceable reference standards, supporting customers’ quality management systems and regulatory obligations.

ISO/IEC 17025 framework

Calibration is performed under DANAK accreditation Reg. No. 9 in accordance with ISO/IEC 17025, including documented measurement uncertainty and traceability to recognised standards. This supports audit readiness, contractual verification and defensible technical documentation in national and international contexts.

MID-relevant applications

Calibration results can support applications under the Measuring Instruments Directive where air or gas flow meters are subject to legal metrology requirements. Documented uncertainty and traceability contribute to conformity assessment and ongoing verification processes where applicable.

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Reach out to Jesper Busk for more information.