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8.3 Detectable Gases
Vertex M system Chemcassette™ analyzers are continuous monitoring instruments. The initial analysis period listed in Table C-1 varies based on the programmed alarm levels. This period is valid only after the
system pulls a new Chemcassette™ window. Increasing the programmed alarm levels will decrease the initial sample period.
For accurate detection, gas must be present at sufficient levels and durations. Typical response times are shown in this table at 2 TLV, which will vary in duration depending on the target gas and alarm level
settings. For high concentrations (greater than full scale) a minimum of 4 seconds is required.
1
Gas Name
TLV
Ammonia II (NH
)
25 ppm
3 ppm
3
Ammonia XP (NH
)
25 ppm
1.5 ppm
3
Ammonia XP4 (NH
)
25 ppm
1.5 ppm
3
Arsine (AsH
)
5 ppb
5 ppb
3
Arsine (AsH
)
50 ppb
3 ppb
3
Arsine (AsH
/L)
5 ppb
0.5 ppb
3
Arsine (AsH
) Dry
5 ppb
7 ppb
3
Arsine XP (AsH
) Low
3
5 ppb
0.5 ppb
Level
Arsine XP (AsH
)
5 ppb
3 ppb
3
Arsine XP4 (AsH
)
5 ppb
3 ppb
3
Arsine XP4 (AsH
)
3
5 ppb
0.5 ppb
Low Level
Arsine XPV- Germane
50 ppb
3 ppb
(AsH
)
3
TLV - Threshold Limit Value
LAL - Lowest Alarm Level
1. "-1" calibrations allow more stain development but will extend response times
2. Minimum Sample Time
Default
Default
LAL
LDL
Alarm
Alarm
Level 1
Level 2
3 ppm
25 ppm
50 ppm
1.5 ppm 25 ppm
50 ppm
1.5 ppm 25 ppm
50 ppm
5 ppb
50 ppb
100 ppb
2.5 ppb
50 ppb
100 ppb
0.3 ppb
5 ppb
10 ppb
5 ppb
50 ppb
100 ppb
0.3 ppb
2.5 ppb
5 ppb
2.5 ppb
50 ppb
100 ppb
2.5 ppb
50 ppb
100 ppb
0.3 ppb
2.5 ppb
5 ppb
2.5 ppb
50 ppb
100 ppb
LDL - Lower Detectable Limit
Initial Ana-
Range
Alarm Setting
lysis Period
(second)
3-49.9 ppm
10
0-75 ppm
50-75 ppm
10
1.5-49.9 ppm
10
0-150 ppm
50-150 ppm
10
1.5-49.9 ppm
10
0-150 ppm
50-150 ppm
10
0-500 ppb
5-500 ppb
30
3-14.9 ppb
60
15-59.9 ppb
60
0-500 ppb
60-249.9 ppb
30
250-500 ppb
15
0.5-1.9 ppb
180
2-4.9 ppb
150
0-50 ppb
5-9.9 ppb
60
10-50 ppb
30
7-99 ppb
60
0-500 ppb
100-199 ppb
30
200-500 ppb
15
0.5-1.9 ppb
300
2-4.9 ppb
150
0-50 ppb
5-9.9 ppb
60
10-50 ppb
30
0-500 ppb
3-500 ppb
30
0-500ppb
3-500 ppb
30
0.5-1.9 ppb
300
2-4.9 ppb
150
0-50 ppb
5-9.9 ppb
60
10-50 ppb
30
3-14.9 ppb
60
15-59.9 ppb
60
0-500 ppb
60-249.9 ppb
30
250-500 ppb
15
Time to 1 TLV (Alarm @ 2 TLV Concentration 10-ft.
Sample Line)
<20 sec
<20 sec
<20 sec
<20 sec (Alarm @ 50 ppb with 100 ppb AsH
<16 sec (Alarm @ 50 ppb with 100 ppb gas)
<70sec (Alarm @ 5ppb with 10ppb gas)
<35 sec (Alarm @ 50 ppb with 100 ppb AsH
<45 sec
<20 sec (Alarm @ 50 ppb with 100 ppb AsH
<20 sec (Alarm @ 50 ppb with 100 ppb AsH
<45 sec
<16sec (Alarm @ 50ppb with 100ppb gas)
Chemcassette
Part Number
1295-0221
1295-0405
1257-9309
gas)
1295-0300
3
1295-0566
1295-0566
gas)
1295-0300
3
1295-0226
gas)
1295-0226
3
gas)
1257-9300
3
1257-9300
1295-0564
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