Air extraction within the unit
Achievable negative control values
The achievable baseline (negative control value) readings strongly depend
on the ambient conditions and frequency of use. Experience shows that the
following blank (negative control value) readings may be obtained (values in
mg):
Ambience
CTU 1xxx
Clean room
0.4 … 0.6 mg
Laboratory
0.6 … 1.0 mg
Separate sampling room
0.6 … 1.2 mg
Plant/factory shed
1.0 … 1.4 mg
Maximum particle
size
Requisite
effort
Cleansing time [h]
after brief shutdown
(
≤
24 h)
Cleansing time
[h] after extended
shutdown (
≥
24
h)
100 µm*
high high
high high
1.5 … 4
3 … 5
150 µm*
middle
1 … 2
2 … 4
250 µm*
low
0.5 … 1.5
1 … 3
* Applies to a maximum membrane load of 0.8 mg
CTU 1000 Series
en(us)
Page 35 / 92
BeWa CTU1000 3229578p en-us 2017-04-25.doc
2017-04-25
