Fig. 9a: 图9a：
Contamination guide for hydraulic and lube oil systems 对于液压和润滑油质系统的污染程度说明 ISO Code ISO 代码 Description 描述 Suitable for 适合于
Very clean oil 非常清洁的油 All oil systems 所有油系统 Clean oil 清洁的油
Servo & high pressure hydraulics 伺服或高压液压 Light contaminated oil 轻度污染的油 Standard hydraulic and lube oil systems 标准的液压或润滑系统 New oil 新油
Medium to low pressure systems 中低压系统 Very contaminated oil 污染严重的油 Not suitable for oil systems 不宜使用
Fig. 9b: 图9b：
Contamination guide for gears 对于齿轮的污染程度说明 ISO Code ISO代码
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Description 描述 Suitable for 适用于
Improvement Factor 改进因数
Very clean oil 非常清洁的油 All systems 所有系统 Clean oil 清洁的油
Critical gear system 要求严格的齿轮系统 Light contaminated oil 轻度污染的油 Standard gear systems 标准齿轮系统 New oil 新油
Non critical gear systems 要求不很严格的齿轮系统
Very contaminated oil 严重污染的油 Not suitable for gear systems 不适用于齿轮系统
Oil sample analysis油样分析
Fig. 10: 图10：
Test membranes together with microscopic photographs of various contamination levels
显微镜下不同污染等级的测试膜片。
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For every oil-filled system, a cleanliness goal should be specified. This is the basic requirement to insure reliability at the lowest possible cost. 对于每个油系统，都会有一个指定的清洁度。这是以最低成本保证系统可靠性的基本要求。
Frequency of analysis 分析的频率
In the implementation phase of a condition monitoring system, analyses must be made frequently – at least every six months – in order to establish a knowledge data base.
在情况检测系统的执行阶段，需要经常做分析（至少每6个月1次），以建立起一个认识数据库。
Every oil system should have a log where analysis results are registered, The logbook must also contain information about oil type, oil changes, break-downs, targeted ISO class code and oil analysis results.
每个油质系统都应该有一个日志，用于记载分析结果。日志记录上应该包含油品类型，油品变化，故障，ISO等级以及油品分析结果。
Oil cleaning methods
油品清洁方法
Several oil cleaning methodsare available: 几种油品的清洁方法：
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Fig. 11: Oil cleaning methods 图11：油品的清洁方法 Method 方法 Cleaning action 清理作用
Conventional surface filter 常规的表面型过滤器
Reduce the content of solid particles.减少固体颗粒物含量 Cellulose-based depth filter 纤维基的深度型过滤器
Reduce the content of solid particles, water and resin. 减少固体颗粒，水份和树脂的含量。
Electrostatic filters 静电过滤器
Reduce the content of polar contaminants. 减少有极性的污染物的含量 Centrifugal separator 离心分离器
Reduce the content of particles with a density higher than that of oil.减少密度大于油的颗粒含量
Vacuum filter 真空过滤器
Reduce the content of air and water. 减少空气和水份的含量
All the above technologies are commercially available. 以上所有的技术都在进行商业应用。
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