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6.8 Filter Compatibility
When monitoring non-corrosive target gases, use filter type A, (P/N 780248), a sample line
dust/ particulate filter.
For monitoring corrosive gases, such as chlorine (Cl
chloride (HCl), and hydrogen bromide (HBr), sample lines in a dusty environment or for
outdoors, use filter type B, (P/N 1830-0055), or type C, (P/N 1991-0147) filter assembly for
corrosive gases. The Teflon membrane particulate filter is designed to prevent dust and dirt
greater than one micron from entering the sample line. Unlike standard particulate filters, it
does not exhibit sample loss with corrosive monitoring.
The one micron Teflon membrane contained in the Filter B housing (P/N 0235-1096, 100 per
pack) should be replaced every 30 days.
Filters have an arrow on the side of the filter pointing in the direction of airflow toward the
VC4™ system. Replacement of filters is site dependent.
Filter A - P/N 780248 Filter B - P/N 1830-0055 Filter C - P/N 1991-0147
The following table shows sample filter requirements.
Symbol
NH
3
AsH
3
AsH
3
BF
3
CL
2
B
H
2
6
DMA
F
2
GeH
4
H
S
2
H
S-LL
2
HBr
HBr-LL
HCI
HCI
HCN
VC4™
Gas Name
Ammonia
Arsine
Arsine - Low Level
Boron Trifluoride
Chlorine
Diborane
Dimethylamine
Fluorine
Germane
Hydrogen Sulfide
Hydrogen Sulfide - Low Level
Hydrogen Bromide
Hydrogen Bromide - Low Level
Hydrogen Chloride
Hydrogen Chloride - Low Level
Hydrogen Cyanide
), hydrogen fluoride (HF), hydrogen
2
Filter Type
A
X
X
X
X
X
X
122
Filter Type
Filter Type
B
C
X
X
X
X
X
X
X
X
X
X
User Manual
X
X
X
X
X
X
X
X
X
X
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