液压流体动力. 脱水剂水分离性能评价方法

[中文适用范围]： 本文件规定： ——脱水机水分离能力评估的测试设备、测试电路和程序； ——准备测试液体的程序； ——获取和分析测试流体样品的程序。 本文件仅适用于能够将液压油干燥至测试温度下液压油水饱和度 20% 以下的脱水装置。 本文件提供了一个测试程序，该程序可以产生脱水器除水性能的可重复结果，以便使用相同的测试流体在相同的基础上比较候选单元的性能。 此程序可用于测试脱水器在不同条件下处理不同类型液压油的能力。 可能需要更改部分程序以适应液压油的特性。 例如，测试具有高水溶性的液压油（许多合成和耐火液体）在测试开始时需要更高浓度的水；含有锌基添加剂的液压油测试需要对卡尔费休分析程序进行修改。 然而，可以在本文件定义的条件下进行性能比较。 [外文原描述]： ISO 18237:2017 specifies: - test equipment, test circuit and a procedure for the evaluation of the water separation capabilities of a dehydrator; - a procedure for preparing test fluid; - a procedure for obtaining and analysing the test fluid samples. ISO 18237:2017 applies only to those dehydration units that can dry a hydraulic fluid to less than 20 % of the hydraulic fluid's water saturation level at the test temperature. ISO 18237:2017 provides a test procedure that yields reproducible results for dehydrator water removal performance so that the performance of candidate units is compared on the same basis using the same test fluid. This procedure can be used to test the dehydrator's capabilities on different types of hydraulic fluids at different conditions. Parts of the procedure might need to be changed to suit the hydraulic fluid's characteristics. For example, the testing of hydraulic fluids with high water solubility (many synthetic and fire-resistant fluids) needs higher concentrations of water at the start of the test; the testing of hydraulic fluids with zinc-based additives needs modifications to the Karl Fischer analysis procedure. However, comparison of performance can be made under the conditions defined in ISO 18237:2017.