| 摘要 |
<p>To achieve accurate calibration and diagnosis of an hydrostatic tank gauge system comprising pressure sensors (P1, P2) connected to tank (1) at levels separated by height (H) a stand pipe (10) of flexible tubing is arranged to be connected to the sensors by opening valves (6, 7, 8, 9) when block valves (4, 5) disconnect the tank. Then, after the system isolated from the tank has been flushed, a calibration fluid such as distilled water traceable to a standards organisation is introduced under gravity by way of a disconnectable column (12) through the bottom of the stand pipe. Then, by using the precise knowledge of the fluid properties and readings from the sensors (P1, P2) and temperature sensors (T1, T2, T3) various aspects of the system can be calibrated and checked.</p> |
