Flow Measurement Turn Down Analysis for DP Flow Meter using Multiple Multivariable Transmitters |
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| Akio Ito, Hiromasa Takiguchi, Aya Morokata, Vince Cisar |
- Abstract:
- We conducted differential pressure (DP) flow meter calibration at CEESI and observed that the combined linearity of VERIS Accelabar® flow primary element and Yokogawa EJX910 multivariable transmitter DP measurement indicated excellent performance. The observation result was that linearity with reference flow rate was 0.5% with 15:1 turndown for the EJX910 H range with the 4” VERIS Accelabar® during the 800 psia air test. EJX910 has also L range and we show that adding L range, flow measurement turndown will be increased beyond 15:1 until 20:1. Firstly we show flow rate equation and uncertainty of the combined flow meter. We assume that VERIS Accelabar® flow uncertainty contribution is 0.5% with 20:1 turndown derived by previous experiments. Also, we assume the density contribution as 0.1%. Then, EJX910 L range DP uncertainty at 20:1 turndown point is analysed. With assumption of using L range data tested at the factory, DP measurement uncertainty including reference accuracy and static pressure (SP) span effects is assumed as 0.24%. Flow uncertainty is calculated as 0.52%, which is almost 0.5%. EJX910 is designed with multisensing capabilities using built-in silicon resonant sensor technology. EJX910 dynamically & continuously minimizes the effect of SP fluctuation with two resonators incorporated into one sensor tip and provides precise DP measurement. This shows that EJX910 has an advantage of low DP measurement under high SP condition. This indicates the latest progress of DP flow meter technology and the DP flow meter has still big potential for use in industry widely.
- Download:
- IMEKO-TC9-2019-006.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC9
- Event name:
- FLOMEKO 2019
- Title:
18th International Flow Measurement Conference 2019
- Place:
- Lisbon, PORTUGAL
- Time:
- 26 June 2019 - 28 June 2019