Page 116 - Sterilization Training Manual

DIR INSTALLATION TIPS
Ò Unit Temperature
Unit should operate at around 5oC warmer than the highest cycle temperature. If the unit is operated too cool, condensation can form on the optical surfaces causing erratic readings.
Ò Load Effects
The DIR measures gas concentration in the chamber headspace. The load in the chamber can alter headspace densities by reducing effective chamber volume, absorbing EO, H2O, or both. Any calibration runs should be performed in an empty chamber.
Ò Leaking Fitting
A leaking fitting near the DIR can dilute the gas in the measuring chamber with room air causing low readings. The amount of dilution will be a function of the leak location, leak size, and chamber pressure.