| Zugriffsnummer | 36788 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Development of a calibration process for water meters close to real world conditions |
| Autor(in); Institution |
Schumann, Daniel; 1.5, Flüssigkeiten, PTB-Braunschweig
Wendt, Gudrun; 1.5, Flüssigkeiten, PTB-Braunschweig
Tränckner, J.; Universität Rostock, Rostock, GERMANY
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| Quelle/Jahr | 17th International Flow Measurement Conference, FLOMEKO 2016:(2016), 1 - 5 |
| Availability | [Online only] |
| URL | |
| Konferenzangaben | 17th International Flow Measurement Conference, FLOMEKO, Sydney, 26-29, September, 2016, Australia |
| Zusammenfassung | A growing awareness of environment as well as consumption leads to rising and novel requirements on flow metering technology, e. g. higher flowrate ranges, smaller measurement uncertainties and calibration procedures more orientated to the actual requirements of further use. This means a changeover from ideal stationary calibration conditions to realistic measurements and a demand for meters which operate precisely under the real working conditions. As an example, realistic conditions, especially the profiles of real water demand, deviate fundamentally from the existing test procedures of water meters at well defined, constant and reproducible reference flows as prescribed, for instance, in the existing documents in legal metrology like OIML R49 [1] or ISO 4064 [2]. In real world, a daily profile of water consumption is characterized by short water tappings, overlays of different tapping events, varying flank increases, leakage and stagnation. The main purpose of the investigations described is to develop both - highly realistic calibration procedures for water meters based on real water consumption profiles as well as the physical opportunities to generate them. Based on the analysis of water consumption measurements at more than 300 German households and of several international consumption profiles, realistic flowrates and flowrate sequences can be identified. To simulate such highly variable flowrates, a device-related test setup using cavitating nozzles has been developed. With the test rig, it is possible to generate reproducible dynamic flowrates also under laboratory conditions. The corresponding behaviour of different water meters at the simulated consumption profiles are recorded electronically and are traceable to a gravimetric standard. First results show remarkable differences in the behaviour of the water meters in dependence on the different realistic profiles used. |
