Dosimeter Tubes
Passive dositubes are used to measure time-weighted average (TWA) gas concentrations over longer periods. Dositubes use the principle of the natural diffusion of gas.
List of Benefits
- Compact, lightweight, and versatile (can be used anywhere)
- Easy direct measuring and reading
- No sampling pump necessary
| Gas or Vapour to be Measured Chemical Formula |
Gastec Tube No. & Name |
Measuring Range (ppm) |
Measuring Time (hours) |
Shelf Life (year) |
Note | TLV-TWA,C (ACGIH) (ppm) |
|
| Acetaldehyde CH3CHO |
91D | Formaldehyde | 0.1-20 | 1-10 | 1* | - | C 25 |
| 151D | Acetone | 4-1200 | 1-10 | 2* | T | ||
| 152D | Methyl ethyl ketone | 1.2-360 | 1-10 | 2* | T | ||
| Acetic acid CH3CO2H |
81D | Acid gases | 0.5-100 | 1-10 | 3 | T | 10 |
| Acetic anhydride (CH3CO)2O |
81D | Acetic acid | 0.45-90 | 1-10 | 3 | T | 5 |
| Acetone CH3COCH3 |
151D | Acetone | 5-1500 | 1-10 | 2* | T | 500 |
| 152D | Methyl ethyl ketone | 1.4-420 | 1-10 | 2* | T | ||
| Ammonia NH3 |
3D | Ammonia | 2.5-1000 | 0.5-10 | 3 | T | 25 |
| 3DL | Ammonia | 0.1-10 | 1-10 | 2 | T | ||
| Benzene C6H6 |
122DL | Toluene | 2.4-600 | 1-10 | 2 | T | 0.5 |
| 1,3-Butadiene CH2:CHCH:CH2 |
174D | 1,3-Butadiene | 1.3-200 | 1-8 | 2 | - | 2 |
| Carbon dioxide CO2 |
2D | Carbon dioxide | 0.02-16% | 0.5-10 | 2 | T | 5000 |
| Carbon monoxide CO |
1D | Carbon monoxide | 1.04-2000 | 0.5-48 | 2 | - | 25 |
| 1DL | Carbon monoxide | 0.4-400 | 0.5-24 | 2* | |||
| Chlorine Cl2 |
8D | Chlorine | 0.08-100 | 0.5-24 | 2 | - | 0.5 |
| 132D | Trichloroethylene | 2.4-240 | 1-8 | 1* | T | ||
| Cumene C6H5OH(CH3)2 |
122DL | Toluene | 3.4-850 | 1-10 | 2 | T | 50 |
| trans-1,2-Dichloroethylene ClCH:CHCl |
174D | 1,3-Butadiene | 3.9-600 | 1-8 | 2 | T | 200 |
| 132D | Trichloroethylene | 6-600 | 1-8 | 1* | T | ||
| Dimethylamine (CH3)2NH |
3D | Ammonia | 1.9-750 | 0.5-10 | 3 | T | 5 |
| N,N-Dimethylethylamine C2H5N(CH3)2 |
3D | Ammonia | 4-1600 | 0.5-10 | 3 | T | - |
| Ethanol C2H5OH |
112D | Ethanol | 100-25000 | 1-10 | 3 | - | 1000 |
| Ethyl benzene C6H5C2H5 |
122DL | Toluene | 2.8-700 | 1-10 | 2 | T | 100 |
| Ethylene CH2:CH2 |
174D | 1,3-Butadiene | 1.56-240 | 1-8 | 2 | T | - |
| Ethylene dichloride ClCH2CH2Cl |
174D | 1,3-Butadiene | 3.9-600 | 1-8 | 2 | T | 10 |
| Formaldehyde HCHO |
91D | Formaldehyde | 0.1-20 | 1-10 | 1* | - | C 0.3 |
| Formic acid HCO2H |
81D | Acetic acid | 0.55-110 | 1-10 | 3 | T | 5 |
| Furfural C5H4O2 |
91D | Formaldehyde | 0.3-60 | 1-10 | 1* | - | 2 |
| Hydrazine N2H4 |
3D | Ammonia | 1.6-650 | 0.5-10 | 3 | T | 0.01 |
| Hydrogen chloride HCl |
14D | Hydrogen chloride | 1-100 | 1-10 | 3 | TH | C2 |
| 132D | Trichloroethylene | 1.8-180 | 1-8 | 1* | TH | ||
| Hydrogen cyanide HCN |
12D | Hydrogen cyanide | 1-200 | 1-10 | 2 | - | C 4.7 |
| Hydrogen fluoride HF |
17D | Hydrogen fluoride | 1-100 | 1-10 | 3 | H | C 3 |
| 14D | Hydrogen chloride | 2.5-250 | 1-10 | 3 | TH | ||
| Hydrogen peroxide H2O2 |
32D | Hydrogen peroxide | 0.5-40 | 1-10 | 3 | T | 1 |
| Hydrogen sulphide H2S |
4D | Hydrogen sulphide | 0.2-200 | 1-48 | 3 | - | 10 |
| Isoprene CH2:C(CH3)CH:CH2 |
174D | 1,3-Butadiene | 2.6-400 | 1-8 | 2 | TH | - |
| Methylamine CH3NH2 |
3DL | Ammonia | 0.19-19 | 1-10 | 2 | T | 5 |
| Methyl ethyl ketone CH3COC2H5 |
152D | Methyl ethyl ketone | 2-600 | 1-10 | 2* | T | 200 |
| 91D | Formaldehyde | 0.125-25 | 1-10 | 1* | - | ||
| 151D | Acetone | 6.5-1950 | 1-10 | 2* | T | ||
| Methyl isobutyl ketone (CH3)2CHCH2COCH3 |
151D | Acetone | 11.5-3450 | 1-10 | 2* | T | 50 |
| 152D | Methyl ethyl ketone | 4-1200 | 1-10 | 2* | T | ||
| Nitric acid HNO3 |
14D | Hydrogen chloride | 0.8-80 | 1-10 | 3 | T | 2 |
| 17D | Hydrogen fluoride | 0.32-32 | 1-10 | 3 | TH | ||
| Nitrogen dioxide NO2 |
9D | Nitrogen dioxide | 0.1-30 | 1-10 | 1* | - | 3 |
| 9DL | Nitrogen dioxide | 0.01-3.0 | 1-24 | 1* | - | ||
| Styrene C6H5CH:CH2 |
122DL | Toluene | 26-6500 | 1-10 | 2 | T | 20 |
| Sulphur dioxide SO2 |
5DH | Sulphur dioxide | 10-600 | 1-5 | 3 | T | 2 |
| 5D | Sulphur dioxide | 0.2-100 | 1-10 | 3 | - | ||
| Tetrachloroethane Cl2CHCCl3 |
133D | Tetrachloroethylene | 3-150 | 1-8 | 1* | T | 25 |
| 132D | Trichloroethylene | 1.5-150 | 1-8 | 1* | T | ||
| Toluene C6H5CH3 |
122DL | Toluene | 2-500 | 1-10 | 2 | T | 50 |
| Trichloroethylene Cl2C:CHCl |
132D | Trichloroethylene | 3-300 | 1-8 | 1* | T | 50 |
| Triethylamine (C2H5)3N |
3D | Ammonia | 5.3-2100 | 0.5-10 | 3 | T | 1 |
| Trimethylamine (CH3)3N |
3DL | Ammonia | 0.23-23 | 0.5-10 | 2 | T | 5 |
| Vinyl chloride CH2:CHCl |
174D | 1,3-Butadiene | 1.56-240 | 1-8 | 2 | T | 1 |
| Xylene C6H4(CH3)2 |
122DL | Toluene | 3.4-850 | 1-10 | 2 | T | 100 |
| T:Temp Correction | H:Humidity Correction | *:Refrigerator Store | Mesh:Correction Factor/Chart |