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CM4 Four-Point Continuous Monitor
1.3.3 Chemcassette
Detection System
®
7
Figure 1-4: Chemcassette Detection System
®
1
Chemcassette
tape
2
Electronics
3
LED light source
4
Detector
1. The sample enters the inlet (5) and passes through the
Chemcassette
tape (1) to the sample outlet (7).
®
2. Target gas in the sample flow reacts with the Chemcassette
tape (1) and produces a stain density proportional to the gas
concentration.
3. An LED (3) in the CM4 detector head illuminates the sample
stain. The detector (4) optically measures the stain.
4. The CM4 CPU interprets the stain, then reports a precise
concentration level in parts-per-million (ppm) or parts-per-
billion (ppb).
CM4 Technical Manual
1
2
3
4
5
FLOW
6
Legend
5
Sample inlet
6
Pressure transducer port
7
Sample outlet
1.3.4 Measuring Gases
Chemcassettes
are available for measurement of gases as well as
®
families of gases. Gases and families the CM4 detects include (See
Appendix C
for more information):
Ammonia (NH
)
3
Arsine (AsH
)
3
Boron Trifluoride (BF
Chlorine (Cl
)
2
Chlorine Dioxide (ClO
Diborane (B
H
)
2
6
Dimethyl Amine (DMA)
Dimethyl Hydrazine (UDMH) Phosphine (PH
Fluorine (F
)
2
Germane (GeH
)
4
Hydrogen Bromide (HBr) Tert-Butyl Arsine (TBA)
Hydrogen Chloride (HCl) Tert-Butyl Phosphine (TBP)
Hydrogen Cyanide (HCN) Triethyl Amine (TEA)
Hydrogen Fluoride (HF)
®
The pyrolyzer Model CM4-P is specially designed to detect special gases
using high temperature to "crack" those gases into Chemcassette
detectable gases. Current CM4-P detectable gases are:
Nitrogen Trifluoride (NF
Methyl Fluoride (CH
The Model CM4-P is not designed to accept other calibrations, and
cannot be converted.
1-5
Hydrogen Iodide (HI)
Hydrogen Selenide (H
Se)
2
)
Hydrogen Sulfide (H
S)
3
2
Hydrazine (N
H
)
2
4
)
Monomethyl Hydrazine (MMH)
2
Nitrogen Dioxide (NO
)
2
Phosgene (COCl
)
2
)
3
Silane (SiH
)
4
Sulfur Dioxide (SO
)
2
Tetrakis(dimethylamino) titanium
(TDMAT)
)
3
F)
3
®
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