发明名称 |
MULTI-MEASUREMENT VORTEX FLOW METER |
摘要 |
Two-wire transmitters are described in which the required voltage that a control room must supply to the transmitter is lower at high current than at low current, thus freeing up more voltage for other uses, and in which a constant set of operating voltages may be maintained. A corrected pressure in a vortex flow meter may be determined that reflects the mass flow rate. Thus, the mass flow rate may be determined based on the corrected pressure reading and a measured volumetric flow rate. Density may be determined from pressure and temperature using a table containing error values based on a standard density determination and a relatively simple approximation. During operation of a flow meter, the stored error values may be linearly interpolated and the approximation may be computed to determine the density from the stored error value. |
申请公布号 |
EP1585943(A2) |
申请公布日期 |
2005.10.19 |
申请号 |
EP20030794523 |
申请日期 |
2003.08.29 |
申请人 |
INVENSYS SYSTEMS, INC. |
发明人 |
COOK, WARREN, E.;LEWICKE, JOSEPH, J.;ALLSTROM, PETER, E.;VIGNOS, JAMES, H. |
分类号 |
G01F;G01F1/00;G01F1/32;G01F1/86;G01F15/02;G01F25/00;G01N9/26;G01N31/00;G06F19/00 |
主分类号 |
G01F |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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