Manual
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7
7.2
Tips on determining the operation period
The treatment time depends on various factors, e.g.:
Type of smell
Intensity of smell
Size of the room and temperature
Time and intensity of impact
Composition of the material and source of smell
Spread of smell
If you treat a room that is not heated at the time, but will be heated again after treatment, it might
lead to a recurrence of the smell. Thus the room temperature should be kept during treatment
always a little higher than the operation temperature later on (approx.. +5 °C).
In case the smell reappears after the treatment, you might have chosen a much too short treatment
time or the room temperature might have been too low. Repeat the treatment by varying the room
temperature and the treatment time.
8
Shutdown
After the set time is run out, the device automatically switches into Standby mode, as mentioned
above.
The time the treated room needs until the ozone concentration in the air is back to its initial
non-toxic state, or reaches the MAK level of 0.1 ppm, depends on various factors like the air
humidity, the treated material, size of the room, period of treatment etc.
The treated rooms need to be checked on their ozone concentration by trained and
authorized personnel, before they become open for access again.
The mean half-life of ozone is 30 min., depending on temperature, air pressure, UV radiation
etc.
The following calculation can be followed for the determination of the time of regeneration:
If the air concentration is at the time t =0 at a level of 100 % (e.g. 20 ppm- high value!!), It will
be 50% after half an hour (10 ppm). After an hour it will be 25 % (5 ppm). After four hours it
will be only 0.4 %, which equals 0.078 ppm for a relatively high initial air concentration. The
MAK value is on 0.01 ppm. Thus the room can be accessed after four hours again.
Even after four hours we recommend to not access the room before it wasn’t thoroughly
aerated. The regeneration time can be even shortened by the aeration. Always aerate the
treated room afterwards. If the room must be accessed for aeration, wear an adequate
mask.
We recommend waiting at any case at least 4 hours before accessing the room again.
