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Title: Investigations On Installation Disturbances Of Flow Sensors Of Heat Meters
Author: Franz Adunka, Thomas Lederer
Source: 2006 International Symposium on Fluid Flow Measurement
Year Published: 2006
Abstract: This article contributes shortly to the results of the previous studies concerning installation disturbances. The experiments are not finished yet, so that the results are preliminary. The initial measurements on this topic had been carried out on the test rig of the Fern-warme Wien company under the direction of Karlheinz Lechtermann and also on the old test rig at the BEV by F. Adunka, starting in 1996. By the end of 1998 the BEV had built up its new test rig for measurements with a very low uncertainty 1,2. Additionally a Laser-Doppler-Velocimeter (LDV) was purchased by which axial flow profiles after disturbances could be studied. Moreover, the flow profile development in the lines of test rigs could be examined thus giving valuable data on the influence of disturbances on meters under test. The presented results had been published in extracts in 3 and 4, recent measurements on the BEV test rig have been published partly, too (see 4 - 9). The measurements of this article are a sum of the most recent findings, but they are - as mentioned above - preliminary. The investigations were carried out on velocity meters for winged wheel type water me-ters, Woltman meters, ultrasonic meters (US meters), electromagnetic meters (MIDs), with water as the heat carrier at a temperature of 35 C 1. The measurements at the BEV were per-formed with inlet pipes up to 60 D (D inner diameter of the connection pipe of the meter). Because the BEV does not provide of longer test sections, the whole LDV-system was trans-ferred to the PTB-IB. The outcome there was that for distances approx. 92 D significant influences of disturbances on the flow profile could not be discovered any more. For the tests only pipes made of stainless steel had been used, with flanges and with di-ameters matching exactly the inner diameter of the connection flanges of the meters. Some-times problem arose because some of the meters fitted exactly, whereas others had significant dimensional differences. It had taken some time that these discrepancies were discovered. For the recent investigations adapters had been designed as diffusers/convectors with a very small opening angle (approx. 1) for a smooth transition from the standardized inner diameter of the pipes to the flange diameter of the meters. For the recent part of the project, where we also used the LDV-system, only meters with flanges and with a nominal diameter of their connections DN 40 and DN 50 had been investi-gated. The first nominal diameter DN 40 was representative for the large number of small-sized flow sensors (e.g. winged wheel type water meters), the second diameter DN 50 for the group of big-sized flow sensors (e.g. Woltman meters). This restriction was also necessary in order to realise on the test rig the inlet and outlet pipes as long as possible.

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