SPM Single Point Monitor
SPM Technical Handbook
4-11
4.10 Sample Line Limitations
Certain target gases carry sample line restrictions. Note that
the limits are maximums; shorter sample lines are acceptable.
Sample line material must be 1/8” I.D. x 1/4” O.D. FEP Teflon,
P/N 102599.
4.11 Particulate Filters
For dusty conditions, particulate filters may be installed on
sample lines for certain gases. For noncorrosive gases, use
particulate filter type A (P/N 780248). Replace this filter every
six months. For corrosive gases, use filter type B (P/N 1830-
0055) or type C (P/N 1991-0147). Refer to the table below for
specific gases
.
Target Gas
Maximum Sample Line
Filter
Type A
Filter
Type B
Filter
Type C
Standard SPM
SPM with Extended
Sample Option
Aromatic Amines (PPD, MDA, TDA)
15 cm (6 in) Not approved
no lter
Diisocyanates no lter
Hydrazines (N
2
H
4
, N
2
H
4
-low, MMH, MMH-low, UDMH) no lter
n-Butyl Amine 3 meters (10 ft) 8 meters (25 ft) X
Chlorine Dioxide
3 meters (10 ft) 15 meters (50 ft)
X X
Hydrogen Peroxide no lter
Hydrogen Bromide
3 meters (10 ft) *
X X
Hydrogen Iodide no lter
Nitric Acid
1 meter (3 ft) Not approved
X X
Sulfuric Acid X X
Ammonia
3 meters (10 ft) 30 meters (100 ft)
X
Bromine X X
Chlorine X X
Chlorine-low X X
Dimethyl Amine X X
Tetrakis Titanium (TDMAT) X X
Hydrides (AsH3, PH3, SiH4, B2H6, H2Se, GeH4, TBA, TBP) X
Hydrogen Chloride X X
Hydrogen Cyanide X
Hydrogen Fluoride X X
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