Module 3 2019

Ranges and Controls for Critical Steps

➢ Normal Operating Range (NOR): o Natural variations that occur without any change being made in set points o NOR is within the PAR but cannot be controlled ➢ Control Range (CR): o Set point ± limits for target setting e.g. desired temperature ± X⁰C ➢ Proven Acceptable Range (PAR): o Upper and lower limits of a parameter (e.g temperature, reaction time etc) that have been shown to have no detrimental effects on quality o State mid-point of PAR as fixed point in dossier

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