Page 117 - Sterilization Training Manual

DIR INSTALLATION TIPS
Ò Stagnant Sensing Location
A mounting location in an area of the chamber with little or no gas movement may read inaccurately relative to representative chamber densities. With little mixing, gas mixes in the chamber can begin to stratify according to weight. EtO is heavy and will tend to collect near the bottom of the chamber, H2O is relatively light and will tend to migrate to the higher areas of the chamber.
Ò Pressure Packing
The recirculation blower will have a pressure differential from input to output. The pressure differential is a function of the blower parameters and the amount of gas in the chamber. Sensing after (exhaust) the blower can result in higher readings than sensing before the blower.