Instruction manual

120-00004 REV A 10/6/2011 4000 DIGITAL MANUAL PAGE 27
c. Using alternative germicides, which do not contain isopropyl alcohol.
The EtO sensor may also respond to strong odors of colognes and
perfumes, and to certain floor strippers and waxes. Refer to guidelines
above covering isopropyl alcohol. Remember that you are attempting to
monitor parts per million levels of ethylene oxide in an environment that
may contain percent (10,000 ppm = 1 percent) levels of these potentially
interfering compounds.
[N]
= Negative interference
Chart 3: Formaldehyde (HCHO) analyzers
INTERFERING GAS
HCHO
ANALYZE
R
CH
3
CHO
aceton
e
Cl
2
CO
ethanol
glutaraldehyd
e
H
2
H
2
S
HCl
SO
2
17
>10
3
7
[N]
5600
127
200
>10
4
3 §
35
3 §
isopropan
ol
CH
3
OH
methy
l
ethyl
keton
e
n-
butano
l
n-
propanol
NH
3
NO
NO
2
pheno
l
propion
-
aldehyd
e
1000
625
>10
3
3200
2000
300
500
35
[N]
>10
3
160
[N]
= Negative interference
§
= Scrubber available
Chart 4: HCl, HCN, hydrazine analyzers
INTERFERING GAS
A
N
A
L
Y
Z
E
R
C
2
H
5
S
H
Cl
2
CO
H
2
H
2
S
HC
l
HC
N
hydrazi
ne
N
2
O
NH
3
NO
NO
2
SO
2
SO
3
Saturate
d
HC
Uns
at
HC
HCl
0.2
17
[N
]
100
0
>10
4
0.1
—
1
5
>10
4
21
0.6
15
[N]
0.5
>10
4
>10
4
>500
HCN
0.2
20
[N
]
100
0
>10
4
0.1
1
—
6
>10
4
21
1
15
[N]
0.5
>10
4
>10
4
>500
Hydra
–
zine
10
5
[N
]
100
0
>10
4
0.1
45
8
—
>10
4
150
0
130
0
30
[N]
3.5
>10
4
>10
4
>500
[N]
= Negative interference