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发表于 2021-6-22 16:19:24
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If visual examination is used without swab and rinse sampling, it is required to establish a
quantitativevisual limit for a residue on a specified surface under specified viewing conditions. If visual
examinationsupplements swab and/or rinse sampling, such a visual limit determination may be done to
furtherrefine and/or limit what visually clean means. A discussion of that methodology for establishinga
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visual limit is given in Section 7.7.3. Provided the quantitative visual limit is more stringent than aSAL
carryover limit (see Section 5.5)and provided that the equipment surfaces can be viewed in thecleaning
validation protocol under conditions that are the same or more stringent than the viewingconditions
established for the quantitative limit, then this visually clean criterion may be used withoutswab or rinse
sampling. If this approach is used, a second-person verification in protocol executionshould be utilized.
Typical visual limits reported in the literature are 1-4 μg/cm 2 . However, it shouldbe recognized that this
limit depends on factors or conditions such as the nature of the residue, thenature of the surface, the
lighting, the distance of viewing, the angle of viewing, and the visual acuityof the operator.
如果没有擦拭取样或冲洗水取样,仅使用目视检查,则需要量化指定表面上残留的目检限度,并说
明具体观察条件。如果目检作为擦拭或冲洗水取样的补充,则确定目检限度可以明确和/或限制目视
清洁的具体含义。关于设定目检限度方法的讨论详见 7.7.3 节。假如量化的目捡限度比SAL限度(见
5.5 节)更严格,同时假如清洁验证方案中设备表面的目检条件同建立量化限度时的目检条件相同
或更苛刻,则可采用该目视清洁标准而无需进行擦拭或冲洗取样。如果采用该方法,在方案执行时
需要另一个人进行目检的确认。通常文献中的目捡限度是 1-4 μg/cm 2 。当然,该限度受许多因素或
条件影响,如残留特性,表面特性,灯光,观测的距离,观测角度以及观测人员的视力情况。 |
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