Gas or Vapour
to be Measured
Chemical Formula

Gastec
Tube No. & Name

Measuring
Range
(ppm)

Measuring
Time
(hours)

Shelf Life
(year)
(R=Refrigerated)

Note

TLV-TWA,C
(ACGIH)
(ppm)

Acetaldehyde
CH3CHO

91D

Formaldehyde

0.1-20

1-10

1R

-

C 25

151D

Acetone

4-1200

1-10

2R

Temp Correction

152D

Methyl ethyl ketone

1.2-360

1-10

2R

Temp Correction

Acetic acid
CH3CO2Humidity Correction

81D

Acid gases

0.5-100

1-10

3

Temp Correction

10

Acetic anhydride
(CH3CO)2O

81D

Acetic acid

0.45-90

1-10

3

Temp Correction

5

Acetone
CH3COCH3

151D

Acetone

5-1500

1-10

2R

Temp Correction

500

152D

Methyl ethyl ketone

1.4-420

1-10

2R

Temp Correction

Ammonia
NH3

3D

Ammonia

2.5-1000

0.5-10

3

Temp Correction

25

3DL

Ammonia

0.1-10

1-10

2

Temp Correction

Benzene
C6Humidity Correction6

122DL

Toluene

2.4-600

1-10

2

-

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

Temp Correction

5000

Carbon monoxide
CO

1D

Carbon monoxide

1.04-2000

0.5-48

2

-

25

1DL

Carbon monoxide

0.4-400

0.5-24

2R

Chlorine
Cl2

8D

Chlorine

0.08-100

0.5-24

2

-

0.5

132D

Trichloroethylene

2.4-240

1-8

1R

Temp Correction

trans-1,2-Dichloroethylene
ClCH:CHCl

174D

Butadiene

3.9-600

1-8

2

Temp Correction

200

132D

Trichloroethylene

6-600

1-8

1R

Temp Correction

Dimethylamine
(CH3)2NH

3D

Ammonia

1.9-750

0.5-10

3

Temp Correction

5

N,N-Dimethylethylamine
C2Humidity Correction5N(CH3)2

3D

Ammonia

4-1600

0.5-10

3

Temp Correction

-

Ethanol
C2Humidity Correction5OH

112D

Ethanol

100-25000

1-10

3

-

1000

Ethyl benzene
C6Humidity Correction5C2Humidity Correction5

122DL

Toluene

2.8-700

1-10

2

-

100

Ethylene
CH2:CH2

174D

Butadiene

1.56-240

1-8

2

Temp Correction

-

Ethylene dichloride
ClCH2CH2Cl

174D

Butadiene

3.9-600

1-8

2

Temp Correction

10

Formaldehyde
HCHO

91D

Formaldehyde

0.2-40

1-10

1R

-

C 0.3

Formic acid
HCO2Humidity Correction

81D

Acetic acid

0.55-110

1-10

3

Temp Correction

5

Furfural
C5Humidity Correction4O2

91D

Formaldehyde

0.2-40

1-10

1R

-

2

Hydrazine
N2Humidity Correction4

3D

Ammonia

1.6-650

0.5-10

3

Temp Correction

0.01

0.05-0.1

0.05-0.1

Hydrogen chloride
HCl

14D

Hydrogen chloride

1-100

1-10

3

Temp and Humidity Correction

C 4.7

132D

Trichloroethylene

1.8-180

1-8

1R

Temp and Humidity Correction

Hydrogen cyanide
HCN

12D

Hydrogen cyanide

1-200

1-10

3

Humidity Correction

-

Hydrogen fluoride
HF

17D

Hydrogen fluoride

1-100

1-10

3

Humidity Correction

C 3

14D

Hydrogen chloride

1-100

1-10

3

Temp and Humidity Correction

Hydrogen peroxide
H2O2

32D

Hydrogen peroxide

0.5-40

1-10

3

Temp Correction

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

Temp and Humidity Correction

-

Methylamine
CH3NH2

3DL

Ammonia

0.19-19

1-10

2

Temp Correction

5

Methyl ethyl ketone
CH3COC2Humidity Correction5

152D

Methyl ethyl ketone

2-600

1-10

2R

Temp Correction

200

91D

Formaldehyde

0.125-25

1-10

1R

-

151D

Acetone

6.5-1950

1-10

2R

Temp Correction

Methyl isobutyl ketone
(CH3)2CHCH2COCH3

151D

Acetone

11.5-3450

1-10

2R

Temp Correction

50

152D

Methyl ethyl ketone

4-1200

1-10

2R

Temp Correction

Nitric acid
HNO3

14D

Hydrogen chloride

0.8-80

1-10

3

Temp Correction

2

17D

Hydrogen chloride

0.32-32

1-10

3

Temp and Humidity Correction

Nitrogen dioxide
NO2

9D

Nitrogen dioxide

0.1-30

1-10

1R

-

3

9DL

Nitrogen dioxide

0.01-3.0

1-24

1R

-

Sulphur dioxide
SO2

5DH

Sulphur dioxide

10-600

1-5

2

Temp Correction

2

5D

Sulphur dioxide

0.2-100

1-10

3

-

Tetrachloroethane
Cl2CHCCl3

133D

Tetrachloroethylene

3-150

1-8

1R

Temp Correction

25

132D

Trichloroethylene

1.5-150

1-8

1R

Temp Correction

Toluene
C6Humidity Correction5CH3

122DL

Toluene

2-500

1-10

2

-

50

Trichloroethylene
Cl2C:CHCl

132D

Trichloroethylene

3-300

1-8

1R

Temp Correction

50

Triethylamine
(C2Humidity Correction5)3N

3D

Ammonia

5.3-2100

0.5-10

3

Temp Correction

1

Trimethylamine
(CH3)3N

3DL

Ammonia

0.23-23

0.5-10

2

Temp Correction

5

Vinyl chloride
CH2:CHCl

174D

1,3-Butadiene

1.56-240

1-8

2

Temp Correction

1

Vinylidene chloride
CH2:CCl2

132D

Trichloroethylene

6-600

1-8

1R

Temp Correction

5

Xylene
C6Humidity Correction4(CH3)2

122DL

Toluene

3.4-850

1-10

2

-

100

Correction Factor/Chart