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
 

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