3
1
2
T= 21.5 ˚C
RS= 94.5 %RS
T= 22 ˚C
RS= 89.5 %RS
T= 21 ˚C
RS= 100 %RS
Figure 6 Decontaminated space with different temperatures and RS levels (H
2
O
2
and H
2
O
concentration evenly distributed)
1
Center of the decontaminated space. The center is
warmer
than the wall and the window,
and the RS level is lower.
2
Wall of the decontaminated space. Because the wall is 0.5 °C
cooler
than the center of the
space, RS level is higher than in the center.
3
Window of the decontaminated space. The window is 1 °C
cooler
than the center of the
space, and RS = 100 %RS. Condensation starts to form on the window surface.
Condensation forms typically on surfaces, and first on surfaces that are cooler than the
surrounding air, such as:
• Walls
• Windows
• Supplies that have just been brought in the decontaminated space
To monitor the possibility of condensation by measuring RS, it is recommended to measure as
close as possible to places where condensation might occur.
Chapter 3 – H2O2 Measurement
19