| 摘要 |
The invention relates to a method for two-step separation of water, salt and particles from a hydraulic fluid by the use of a control unit (1). The hydraulic fluid is carried into a reservoir oil tank (4) with an electrostatic coalescer (3) provided with a high- voltage transformer (2) with direct current to two electric grids (43, 44) whose electrostatic field gathers water into drops which settle into a collecting tank (5). The hydraulic fluid is circulated to a filter module (9) for removing any remaining water, salt and particles in filter elements (92) connected in parallel, having hygroscopic cellulose fibres which swell until saturation, the swelling being measured by a sensor (93) measuring the degree of saturation, alternatively conductivity.
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