| Model # | 
Description | 
| 141SA* | 
Carbon disulfide, 30-500 ppm | 
| 141SB* | 
Carbon disulfide, 0.8-50 ppm | 
| 100 | 
Carbon monoxide, 5-1000 ppm | 
| ย  | 
(concentration chart method) | 
| 106B | 
Carbon monoxide in the presence of ethylene, 10-1000 ppm | 
| 106C | 
Carbon monoxide in the presence of ethylene and nitrogen oxides, s10-1000 ppm | 
| 106S | 
Carbon monoxide, 10-250 ppm | 
| 106SA | 
Carbon monoxide, 5-2000 ppm | 
| 106SC | 
Carbon monoxide, 1-50 ppm | 
| 106SH | 
Carbon monoxide, 0.1-20% | 
| 106SS | 
Carbon monoxide, 30-500 ppm | 
| 106UH | 
Carbon monoxide, 0.1-20% | 
| 147S* | 
Carbon tetrachloride, 0.5-60 ppm | 
| 239S* | 
Carbonyl sulfide, 5-60 ppm | 
| 109SA | 
Chlorine, 1-40 ppm | 
| 109SB | 
Chlorine, 0.1-10.0 ppm | 
| 109U | 
Chlorine, 0.05-2 ppm | 
| 116 | 
Chlorine dioxide, 1-20 ppm | 
| 178SB* | 
Chlorobenzene, 1-140 ppm | 
| 152S* | 
Chloroform, 23-500 ppm | 
| 172S* | 
Chloropicrin, 0.05-16.0ppm | 
| 168S* | 
Chloroprene, 0.5-20 ppm | 
| 132SC(3)* | 
m-Chlorotoluene, 0.1-12.0 ppm | 
| 132SC(4)* | 
o-Chlorotoluene, 0.1-12.0 ppm | 
| 132SC(5)* | 
p-Chlorotoluene, 0.1-12.0 ppm | 
| 183U | 
Cresol, 0.5-25.0 ppm | 
| 190U(1) | 
Crotonaldehyde, 5-500 ppm | 
| 111U(4) | 
Cumene, 10-1000 ppm | 
| 115S | 
Cyclohexane, 0.01-0.6% | 
| 206U | 
Cyclohexane, 0.01-0.6% | 
| 197U | 
Cyclohexanol, 2-100 ppm | 
| 197U(1) | 
Cyclohexanone, 2-100 ppm | 
| 111U(5) | 
Cyclohexene, 10-1000 ppm | 
| 105SD | 
Cyclohexylamine, 1-20 ppm | 
| 111U(6) | 
Decahydronaphthalene,10-1000 ppm | 
| 111U(7) | 
n-Decane,10-1000 ppm | 
| 190U | 
diacetone alcohol, 10-250 ppm | 
| 242S | 
Diborane, 0.02-5.0 ppm | 
| 105SD | 
Dibutylamine, 2-20 ppm | 
| 214S | 
o-Dichlorobenzene, 5-100 ppm | 
| 215S | 
p-Dichlorobenzene, 10-150 ppm | 
| 235S* | 
1,1-Dichioroethane, 10-160 ppm | 
| 230S* | 
1,2-Dichioroethane, 5-50 ppm | 
| 223S* | 
2,2-Dichloroethyl ether, 2-30 ppm | 
| 132SC(6)* | 
1,1-Dichloroethylene, 0.1-12.0 ppm | 
| 145S* | 
1,2-Dichloroethylene, 5-400 ppm | 
| 180S* | 
Dichloromethane, 10-1000 ppm | 
| 157SB(3) | 
1,2-Dichloropropane, 0.4-80 ppm | 
| 132SC(7)* | 
1,3-Dichloropropane, 0.1-12.0 ppm | 
| 194S* | 
1,3-Dichloropropane, 10-500 ppm | 
| 190U(2) | 
Dicyclopentadiene, 5-500 ppm | 
| 222S* | 
Diethyl amine, 1-20 ppm | 
| 111U(8) | 
Diethyl benzene,10-1000 ppm | 
| 107SA | 
Diethyl ether, 0.04-1.4% | 
| 107U | 
Diethyl ether, 20-400 ppm | 
| 105SD | 
Diisopropyl amine, 1-16 ppm | 
| 229S | 
N,N-Dimethylacetamide, 5-70 ppm | 
| 227S | 
Dimethyl amine, 1-20 ppm | 
| 105SD | 
N,N-Dimethylaniline, 0.5-9 ppm | 
| 123S | 
Dimethyl ether, 0.01-1.2% |