The Haigis DAkkS laboratory for weights is a separate, low-vibration workspace with only one door and no windows, so there are no draughts to influence the calibration result. An air conditioning system provides fresh air and heat, keeping the temperature between 20°C and 23°C and the relative humidity between 40 and 60%. Electronic measuring equipment records the temperature, relative humidity and air pressure, values needed to calculate the conventional weight value.
The accuracy and reliability of weighing is directly related to the laboratory room, weighing table and scales.
Haigis was accredited by PTB, the National Metrology Institute of Germany in Braunschweig, as a laboratory for weights of the DKD (German Calibration Service) in 1996.
Accreditation in Germany was changed on 1 January 2010 in accordance with regulation (EC) no. 765/2008. The accreditation body of the Deutscher Kalibrierdienstes (DKD) was transferred to the Deutsche Akkreditierungsstelle GmbH (DAkkS) effective on 17 December 2009.
We have been re-accredited by the Deutsche Akkreditierungsstelle (DAkkS) since December of 2011.
We determine the metrological properties of each weight and issue a calibration certificate. The certificate confirms traceability to the national measurement standard.
All laboratory scales are continuously monitored to this end. The test weights (measurement standards) we use are certified by the DAkkS. The accreditation authorises us to perform metrological tests of weights in error limit classes E2, F1, F2, M1, M2 and M3 in the weight sizes of 1 mg to 50 kg and 100kg to 500kg in classes M1, M2 and M3. The measurement result is documented with a DAkkS calibration certificate.
Each of the five weighing tables stands on special damping feet to consistently absorb vibrations. The low-vibration, stable, antimagnetic and antistatic tables are made of massive stone and weigh around 600 kilograms each. Each table serves as the exclusive workstation for weighing results.
The scales determine the measurement uncertainty of the calibrated weights. Therefore, all scales are equipped with a wind screen to protect the sample from temperature influences, air currents and draughts. Class E1 reference weights from 1 mg to 50 kg that are regularly traced back to the national measurement standard serve as test weights.