23
Return air did not heat to set point
Blower overheat 185.0°F
A/D read failure
Chamber did not heat to set point
Heat Control Failure
Door forced open while locked
Lock failed to operate while locking
Lock failed to operate while unlocking
Power fail during cycle
Ambient too hot 185°F
Ambient too cold 37.4°F
Chamber temperature sensor 1 fail
Chamber temperature sensor 2 fail
7.0 INDEPENDENT TEMPERATURE LOGGER
To monitor conditions at the site of heat treatment, chemical indicators (CIs) are
typically used to determine if the conditions have been met to inactivate
microorganisms. For the dry heat process these conditions are time and
temperature. This is a new cycle specifically established for N95 masks. The
temperatures are >200°F lower than the RH-‐Pro11 medical instrument
sterilization cycles. No chemical indicator has been developed for this cycle. A
better and more direct approach has been taken using an independent
temperature sensor (CIR) that replaces the use of a chemical indicator. The CIR
will document and record the time and temperature every 10 seconds (printout
records every minute) at the location of mask placement. Data gleaned from this
logger is stored on the logger during the decontamination cycle and downloaded
upon completion of the cycle.
We have demonstrated that this approach to replacing CIs with an CIR does
provide the time and temperature parametric data far superior to that of a CI. See
figure below. A representative graph is shown that is generated during the
decontamination cycle. (Tabular data is also computer stored.)
CIR Generated Data of N95 Decontamination Cycle
