KROHNE - The Benchmark For Calibration
The method used to calibrate a meter prior to shipment is key to its subsequent performance in the plant. KROHNE has been manufacturing flowmeters for over 80 years. Before any of its electromagnetic or ultrasonic meters are shipped to a customer, they are wet-calibrated by direct comparison of volumes. This is the most accurate method of all. Coriolis flowmeters are calibrated by comparing masses using high precision calibrated scales.
Accuracy and reproducibility are key quality attributes of a flowmeter. The PTB's (German national metrology institute) transfer standard relies on KROHNE flowmeters. Transfer standards generally ensure the accuracy of calibration rigs from manufacturers of measuring instruments.
KROHNE is PTB's transfer standard
The PTB uses a mobile measuring station with a measuring section consisting of several
electromagnetic KROHNE flowmeters and fixed inlet and outlet runs to validate other calibration rigs
with respect to transfer standard reproducibility (0.02% of measured value). That is, when PTB
calibrates calibration equipment from other manufacturers, the accuracy and reproducibility is based on
KROHNE flowmeters. Aside from PTB, other standards calibration authorities in Europe also rely on
KROHNE flowmeters for their transfer standards, including BEV in Austria.
KROHNE has the largest and most accurate calibration rigs in the world
KROHNE has a global network of advanced calibration rigs that it uses to ensure the reliability of its
flowmeters. KROHNE operates the world's largest and most accurate calibration rig for electromagnetic
and ultrasonic flowmeters in Dordrecht, the Netherlands.
The height of 42 meters allows measuring instruments with a diameter of 3 meters and flow rates of up to 8000 liters per minute to be calibrated. The calibration tower has a capacity of one-half million liters of water. The calibration volume of KROHNE's Altometer tower has an uncertainty of 0.011%. This fulfills the requirements of all custody transfer standards in the oil and gas industry.
KROHNE operates additional calibration rigs accredited to the strictest calibration standards in Germany, France, Great Britain, the United States, Brazil, China and India.
KROHNE is also able to calibrate flowmeters together with their inlet and outlet runs for particularly difficult and demanding applications. Detlef Jacobi, KROHNE's technical director points out: "It does not matter where our flowmeters are made; KROHNE is always a leader when it comes to precise calibration."
SOURCE: KROHNE Messtechnik GmbH & Co. KG