KBF-LQC (E5.2) 12/2010
page 14/106
1.6
Intended use
Climatic chambers series KBF-LQC are suitable for exact conditioning of harmless materials. A mixture of
any component of the charging material with air must NOT be explosive. The operating temperature must
lie below the flash point or below the sublimation point of the charging material.
Observing the instructions in this operating manual and conducting regular maintenance
work (chap. 18) is part of the intended use.
1.7
Resistance of the humidity sensor against harmful substances
The following list of harmful substances refers only to the humidity sensor and does not consider any
other materials incorporated in the unit or prohibited substances in relation to explosion protection.
Some gases - especially clean gases - do not have any influence on the humidity sensor. Others do have
only very small influence, whereas others may influence the sensor to a large extent.
•
The following gases do not influence the sensor and the humidity measurement: Argon (Ar), carbon
dioxide (CO
2
),helium (He), hydrogen (H
2
), neon (Ne), nitrogen (N
2
), nitrous oxide (N
2
O), oxygen (O
2
)
•
The following gases do not or only to a minor extent influence the sensor and the humidity measure-
ment: Butane (C
4
H
10
), ethane (C
2
H
6
), methane (CH
4
), natural gas propane (C
3
H
8
)
•
The following gases do not or only to a minor extent influence the sensor and the humidity measure-
ment, provided that the indicated loads are not exceeded:
Maximum work place
threshold limit value
Tolerated concentration
with permanent load
Substance
Formula
ppm
mg/m
3
ppm
mg/m
3
Ammonia NH
3
20 14 5500
4000
Acetone CH
3
COCH
3
500
1200
3300
8000
Benzene
300
1200
150000
Chlorine Cl
2
0.5 1.5 0.7 2
Acetic acid
CH
3
COOH 10
25
800
2000
Ethyl acetate
CH
3
COOC
2
H
5
400
1400
4000
15000
Ethanol C
2
H
5
OH 500 960 3500 6000
Ethylene glycol
HOCH
2
CH
2
OH 10
26
1200
3000
Formaldehyde HCHO
0.3
0.37 2400 3000
Isopropanol (CH
3
)
2
CHOH 200
500
4800
12000
Methanol CH
3
OH 200 260 3500 6000
Methyl ethyl ketone
C
2
H
5
COCH
3
200
590
3300
8000
Ozone O
3
0.1 0.2 0.5 1
Hydrochloric acid
HCl
2
3
300
500
Hydrogen sulphide
H
2
S 10 15 350
500
Nitrogen
oxides
NOx 5 9 5 9
Sulphur dioxide
SO
2
5 13
5 13
Toluol C
6
H
5
CH
3
100
380
1300 5000
Xylene C
6
H
5
(CH
3
)
2
100
440
1300
5000
These values are to be considered as approximate values. The sensor resistance largely depends on
the temperature and humidity conditions during the time of exposition to harmful substances. Avoid
simultaneous condensation. Tolerated error of measurement: ± 2 %r.H. The maximum work place
threshold limit value is the value which can be regarded harmless for humans.
