Boersch, Michael

Burger, Birgit

Consogno, Guido

Ebersoldt, Andreas

Erni, Pascal

Grohmann, Steffen

Janzen, Andreas

Okanovic, Miralem

English

KITopen

Summary and Outlook■ Successful proof of functionality and accuracy under cryogenic operating conditions■ Further performance tests are planned at CERN■ Market introduction planned until end of the year 2018 under the product name WEKASENSE®■ Advantages of the measurement principle:  –  High accuracy (uncertainties < 1 % w.r.t. the actual flow rate) − In situ calibration under real operating conditions − Small operating losses (pressure drop, temperature increase) − Minimum space requirement − Easy installation and commissioning − Integrated temperature measurementCryogenic tests at the GSIExperimental results■ Experimental proof of functiona- lity in a wide temperature and  mass flow range■ Measurements in the range of  – T: 4.5 K to 290 K – p: 1.8 bar to 5 bar – m: 1 g/s to 6 g/s  over 11 days of continuous   testing■ Measurements of different mass    flow meters were in the expected  rangeARCA Flow Group worldwide: Competence in valves, pumps & cryogenicsWEKA AG · Schürlistrasse 8 · CH-8344 Bäretswil · www.weka-ag.ch · info@weka-ag.chField test results of self-calibrating cryogenic mass flow meter WEKASENSE®P. Erni, M. Boersch, D. Oertig, J. Drache, G. Consogno, M. Okanovic(WEKA AG, Switzerland)S. Grohmann, A. Janzen1,  A. Ebersoldt, B. Burger (KIT, Germany)1 (Now at general Electric, Germany)C. Schroeder (GSI, Germany)IntroductionWEKA developed together with Karlsruhe Institute of Technology (KIT) a mass flow meter for cryogenic applications. The sensor is based on a new thermal measurement principle developed and verified by KIT. After successful validation of the self-calibrating capability of the sensor at cryogenic conditions in the TOSKA facility in Karlsruhe, the sensor was installed in several field test applications e.g. at the Helmholtzzentrum für Schwerionenforschung (GSI) in Darmstadt and at the Karlsruhe Institute of Technology (KIT) to perform the cold testing at a Laminar Flow Element (LFE) test bed. The results gained from these field test installations are presented.Measurement principle and scope of field tests■ Caloric measurement principle (Grohmann, S. (2014): A new method for flow measurement  in cryogenic systems. Cryogenics, vol. 60, March-April 2014, pp. 9–18.)■ Measurement of heat input and temperature differences■ Compensation of systematic  measuring uncertainties and  calculation of mass flow by  automatic self-calibration routineQ̇ ṀElectronicsDigital InterfaceAnalog outputṀ : 1 x 0…10 VDC  1 x 4…20 mADCAnalog inputPower supply: 24 VDCSystem pressure: 0…10 VDCTF́ TA TF́ ´■ 3 measurement modes: – Self-calibration mode  – Continuous measurement mode – Standby mode (no heat input, only temperature   measurement■ Field tests at the GSI were performed to  – verify the measurement uncertainty in   self-calibration mode – determine the measurement uncertainty in   measurement mode■ Field tests at the KIT were performed to verify the  accuracy in measurement mode and functionalityProcess parametersFluid GHe/LHenot superfluid, not 2-phaseMeasurement range 0.2…12 g/sTemperature range 3 K…100 KNominal pressure PN25Pressure drop a few 10 mbar depending on the operating conditions,  Bsp. 50 mbar @ 7 g/s, 4.5 K, 5 barTemperature increase a few 10 mK depending on the operating conditionsMeasurement accuracy < 1% of the actual flow rate under stable operating conditionsCryogenic functional tests at the LFE test bed at the KITExperimental setup Experimental results■ Full functionality test with successful checking  of all measurement modes  – Self-calibration mode  – Continuous measurement mode – Standby mode■ Installation in a vacuum chamber with fluid heater■ Fluid flow in the picture: from right to left■ Reference measurements with a Laminar Flow  Element flowmeter (marked and highlighted in the   picture)■ Measurements in the range of  – T: 55 K to 45 K – p: 1.1 bar – m: 0.5 g/s to 1.0 g/s – Several days of testing·

Field test results of self-calibrating cryogenic mass flow meter WEKA-Sense

https://publikationen.bibliothek.kit.edu/1000088160/20378666

Field test results of self-calibrating cryogenic mass flow meter WEKA-Sense

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