Only regular calibrations ensure accurate measurement results in the long term

Recalibration of flow sensors according to DIN EN ISO 9001 and DIN EN ISO/IEC 17025 (DAkkS calibration)

Why recalibrate?

In order to achieve exact measurement results at all times, the sensors must be recalibrated at regular intervals. This is the only way to ensure reliable measurement and thus good process stability.



The user is responsible for determining the calibration interval. The intervals should be chosen in such a way that changes to the measuring equipment have no relevant effect on the measurement results. Specific operating conditions and environmental influences can have an effect on the measuring equipment. This can lead to gradual changes in measurement results. If the values are outside the tolerance, consequential damage may occur in the further process. In addition, standards, directives or legal regulations may specify the time interval for recalibration.

Thanks to a large number of different test rigs for flow sensors, we are able to calibrate anemometers from a wide range of manufacturers. These calibrations can be carried out in water, in air or also in other gaseous media, such as argon, propane, hydrogen, natural gas, landfill gas, helium, butane, oxygen, in all noble gases, non-aggressive gases and in gas mixtures.

The following sensor types/measurement methods can be calibrated at the Höntzsch Calibration Centre:


Thermal flow sensors / hot-wire anemometers

  • Impeller flow sensors / anemometers
  • Vortex flow sensors
  • Pitot tubes
  • Prandtl pitot tubes
  • Venturi nozzles DIN EN ISO 5167
  • Inlet nozzles / (Smooth Approach Orifice) SAO nozzles
  • Cone flow meters / V-Cone DIN EN ISO 5167
  • Orifice plates DIN EN ISO 5167
  • Laminar Flow Elements (LFEs)
  • Ultrasonic flow measurement
  • Rotary piston gas meter
  • Variable area flowmeters
  • Mass flow meters
  • Differential pressure sensors
  • Turbines
  • Wind speed meters
  • Bellows gas meter


For the physical measurands

  • Flow velocity of gases
  • Flow rate of gases
  • Volume of flowing gases
  • mass of flowing gases

our calibration laboratory is accredited by the German Accreditation Body (DAkkS) according to DIN EN ISO/IEC 17025. Through the committee work in the German Calibration Service (DKD), we are in constant exchange with other calibration laboratories. In order to fulfil the standard requirements of DIN EN ISO/IEC 17025 and thus to be able to guarantee the highest possible accuracy of our measurements, our laboratory regularly participates in interlaboratory comparisons.

A re-calibration can include a calibration "as found" (input calibration) at the customer's request. The entire scope of services is performed in one run in our Höntzsch calibration laboratory. Höntzsch's own equipment is tested (incoming test) and, if required, undergoes maintenance and adjustment including calibration "as left". Due to our many years of experience, we are also able to adjust third-party devices, depending on the manufacturer and type.



For a quick and correct order processing we need:

  • Your order (with contact person for technical questions)
  • Manufacturer, type and serial number of the equipment
  • Explanation of the hazard potential
  • Desired calibration points (calibration pressure, if applicable)
  • Mechanical and electrical connection
  • Operating instructions and last calibration certificate
  • Desired calibration medium
  • DAkkS or factory calibration

If you wish, we can perform a calibration "as found" (input calibration). In this case, the sensor is calibrated as delivered. The advantage of this is obvious: if a measurement deviation is detected, you can correctly assess and correct your last measurement results.

If you have any questions about the proper transport of the test specimens, please do not hesitate to contact us.