CM4 Four-Point Continuous Monitor
CM4 Technical Manual
C-10
Gas Name
TLV
LAL
LDL
Default
Alarm
Level 1
Default
Alarm
Level 2
Range
Alarm Setting
Initial
Analysis
Period
(seconds)
Time to 1 TLV
Alarm @ 2 TLV
Concentration
10 Foot Sample
Line
Chemcassette
Part Number
Hydrogen Sulfide
(H
2
S)
Low Level
1 ppm
10 ppb
8 ppb
500 ppb
1000
ppb
8-2000 ppb
10-99 ppb
100-499 ppb
500-999 ppb
1000-2000 ppb
480
240
120
60
0*
<30 sec
874304
Hydrogen Sulfide XP4
(H
2
S)
XP4 Hydrides
1 ppm
1 ppm
0.5 ppm 10 ppm
20 ppm
0.5-50 ppm
1-4.9 ppm
5-9.9 ppm
10-50 ppm
30
15
5
0*
<5 sec
(Alarm @ 10 ppm
with 20 ppm H
2
S
gas)
1258-9300
Hydrogen Sulfide XP4
(H
2
S)
Low Level
XP4 Hydrides
1 ppm
20 ppb
15 ppb 500 ppb 1000 ppb 15-2000 ppb
20-99 ppb
100-199 ppb
200-399 ppb
400-2000 ppb
120
60
30
15
5*
<15sec
(Alarm @ 500
ppb with 1000
ppb H
2
S gas)
1258-9300
Hydrogen Sulfide XP
(H
2
S)
XP Hydrides
1 ppm
1 ppm
0.5 ppm 10 ppm
20 ppm
0.5-50 ppm
1-4.9 ppm
5-9.9 ppm
10-50 ppm
30
15
5
0*
<5 sec
(Alarm @ 10
ppm with 20
ppm H
2
S gas)
1874-9300
Hydrogen Sulfide XP
(H
2
S)
Low Level
XP Hydrides
1 ppm
20 ppb
15 ppb 500 ppb
1000
ppb
15-2000 ppb
20-99 ppb
100-199 ppb
200-399 ppb
400-1500 ppb
120
60
30
15
5*
<15 sec
(Alarm @ 500
ppb with 1000
ppb H
2
S gas)
1874-9300
Hydrogen Sulfide XP
(H
2
S)
Dry
XP Hydrides
1 ppm
1 ppm
0.5 ppm 10 ppm
20 ppm
0.5-50 ppm
1-4.9 ppm
5-9.9 ppm
10-50 ppm
30
15
5
0*
<5 sec
1874-9300
Table C-1: Chemcassette Detectable Gases (cont’d)
* = Minimum Sample Time TLV = Threshold Limit Value LAL = Lowest Alarm Level LDL = Lower Detectable Limit
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