Press release

 

12.01.2017

New flow rate calibration laboratory (volume flow / mass flow)

The ability to obtain accurate, reproducible measurements of flow rates in air-conditioning and process air systems is more important today than ever before. Meters are used in a wide range of applications from recording air consumption to ensuring constant provision of adequate ventilation, e.g. to protect employees or the environment when handling hazardous materials. In every case it is essential that the instruments used deliver reliable readings – so regular calibration is vital.

 

DAkkS calibration for air-conditioning and process air meters

To guarantee that these systems provide reliable data, the calibration laboratory operated by Walcher Meßtechnik GmbH has recently gained DAkkS accreditation for flow rate meters (volume flow / mass flow) and the medium of air. The test facility can operate at flow rates of up to approx. 10 m/s and is therefore perfect for calibrating air-conditioning and process air meters.

Walcher Meßtechnik GmbH has recently gained DAkkS accreditation for flow rate meters (volume flow / mass flow) and the medium of air
 

The calibration laboratory was subjected to a rigorous, expert assessment to ensure compliance with DIN EN ISO / IEC 17025:2005. This included the rooms, measurement processes, management system and, not least, the expertise of its staff in performing flow rate measurements. The process concluded with the presentation of the accreditation certificate by Deutsche Akkreditierungsstelle GmbH (DAkkS) – the only authority permitted to issue accreditations of this type in Germany.
It officially confirms that Walcher Meßtechnik GmbH is competent to perform DAkkS calibrations of flow rate meters. This authorisation now enables the company to offer DAkkS calibration services itself. The DAkkS calibration certificate is recognised and accepted internationally. It details all the relevant environmental factors as well as measuring and stating the margins of error for each measurement point.

 

Calibration facility evaluates air flow across the full cross-section of the duct

 
Fig. 1: Modern, DAkkS accredited facility for calibration of volume flow and mass flow meterszoom
Fig. 1: Modern, DAkkS accredited facility for calibration of volume flow and mass flow meters

The test facility generates an air flow and calibrates the measurement system across the full cross-section of the air duct. Each air duct has a distinctive flow rate profile, e.g. the effect of friction against the duct walls means that the air flow rate may be lower at the outer edges than at the centre. The key difference between the measurement technique used in this calibration facility and the widely used laser Doppler anemometer (LDA) is that it measures the flow rate across the full cross-section of the duct rather than at a single point. The calibrations are performed at a number of different flow rates. The system calculates the air density by measuring not only atmospheric pressure but also the temperature and humidity in the system and the surrounding air.

 
 

The test facility is capable of generating and measuring regulated air volume flow rates of 25 m³/h to 4,500 m³/h or air mass flow rates of 30 kg/h to 5,400 kg/h.
The test facility can be adapted to calibrate a wide range of air flow measurement systems: The systems are installed in suitable air ducts with diameters from 50 mm to 700 mm (round/rectangular). Balometers and other volume flow measurement sections, which are supplied in a section of the pipe or duct, can be flange mounted. The laboratory either reads the values from a display or measures an electrical output signal; the laboratory is also equipped with high quality pressure measuring technology for primary elements such as measuring orifices, flow pressure probes, Venturi tubes, Wilson flow grids etc. It offers every technology required for the calibration of standard volume flow and mass flow measurement systems and their components.


Fig. 2: Inlet nozzles in the volume flow and mass flow calibration facility  zoom
Fig. 2: Inlet nozzles in the volume flow and mass flow calibration facility
 
 
 
 

 
 
 
 

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