CM4 Four-Point Continuous Monitor
CM4 Technical Manual
C-9
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 Fluoride XP4
(HF)
2 ppm 0.4 ppm 0.4 ppm
2 ppm
4 ppm
0.4-20 ppm
0.4-0.9 ppm
1-3.9 ppm
4-20 ppm
240
90
60
0*
<30 sec
1258-9310
Hydrogen Iodide
(HI)
None
Estab-
lished
0.2 ppm 0.1 ppm
3 ppm
6 ppm
0.1-25 ppm
0.2-1.4 ppm
1.5-25 ppm
240
60
2*
<20 sec
874337
Hydrogen Selenide
(H
2
Se)
50 ppb
8 ppb
6 ppb
50 ppb
100 ppb
6-500 ppb
8-49 ppb
50-99 ppb
100-500 ppb
180
120
60
5*
<35 sec
874300
Hydrogen Selenide XP
(H
2
Se)
50 ppb
8 ppb
6 ppb
50 ppb
100 ppb
6-500 ppb
8-49 ppb
50-99 ppb
100-500 ppb
180
120
60
5*
<100 sec
1874-9300
Hydrogen Selenide XP4
(H
2
Se)
50 ppb
8 ppb
6 ppb
50 ppb
100 ppb
6-500 ppb
8-49 ppb
50-99 ppb
100-500 ppb
180
120
60
5*
<100 sec
1258-9300
Hydrogen Sulfide
(H
2
S)
1 ppm
1 ppm
0.5 ppm 10 ppm
20 ppm 0.5-100 ppm
1-9.9 ppm
10-19.9 ppm
20-39.9 ppm
40-100 ppm
30
15
10
5
0*
<10 sec
874304
Hydrogen Sulfide
(H
2
S)
Hydrides
1 ppm
2 ppm
1 ppm
10 ppm
20 ppm
1-50 ppm
2-9.9 ppm
10-19.9 ppm
20-39.9 ppm
40-50 ppm
60
45
30
15
0*
<10 sec
874300
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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