halstrup-walcher operates a calibration laboratory accredited by the Deutschen Akkreditierungsstelle GmbH in accordance with DIN EN ISO / IEC 17025 to guarantee the correct functioning of measurement systems. It is approved for calibrating a variety of measurements including flow rate (volume flow / mass flow) of the medium “air”. The reference value for the laboratory is a maximum flow velocity of 10 m/s. The test facility is therefore perfectly designed for the calibration of measurement systems in air conditioning and process air ducts.

The modern air flow measurement facility ensures reliable results and calibration processes.
It offers the following features:

• Volume flow and mass flow measurements based on the differential pressure principle
• The full cross-section of the duct is taken into consideration; measurements are not point-specific (friction is greater at the edges and velocity higher in the middle)
• Generation of an even air flow with several different velocities (min. five for DAkkS calibration)
• Regulated air volume flow from 25 to 4,500 m³/h or air mass flow from 30 to 5,400 kg/h
• Test facility offers a measurement uncertainty of less than 1 % of the measured value (mass flow)
• Equipped for duct diameters from 50 to 700 mm (round / rectangular) in accordance
  with DIN EN 1505 and 1506 (others on request)
• Highest level of precision – measurements take account of the air density in the system and outside air (documented in the calibration certificate)
  

No adjustments are made to the test objects / instruments during a calibration. Recalibration is recommended if (external) adjustments / changes are made. Calibration is precisely adjusted to reflect the duct diameter, test object and measurement. It is offered for equipment from all manufacturers.