| |
|
|
|
Carbon tetrachloride |
|
NO.134 |
|
CCl4 |
 |
|
Performance |
|
|
Measuring Range |
|
0.5 to 2.5
ppm |
2.5 to 60
ppm |
|
|
Number of Pump
Strokes |
|
|
Correction Factor |
|
|
Sampling Time |
1
minute per pump
stroke |
|
Detecting Limit |
0.2 ppm (n=5) |
|
Colour Change |
White → Yellow |
|
Reaction Principle |
CCl4
+ I2O5
+ H2S2O7
→ COCl2
COCl2
+ (CH3)2NC6
H4CHO→
(CH3)2NC6
H4Cl2
(CH3)2NC6
H4Cl2
+ (C6H5)2NH
→ Yellow product
|
|
Coefficient of
Variation |
15% (for 2.5 to 20
ppm), 10% (for 20 to
60 ppm) |
|
Shelf Life |
1
Years |
|
Corrections for
temperature &
humidity |
Unnecessary |
|
Store the tubes in
the refrigerator to
keep at 10ºC (50ºF)
or below. |
|
|
Possible coexisting substances and
their interferences
(NOTE) |
|
Substance |
Concentration |
Interference |
Change colour by itself to |
|
|
Hydrogen chloride |
100 ppm |
+ |
Yellow |
|
Chlorine, Bromine |
50 ppm |
+ |
Yellow |
|
Vinyl chloride,
Methylene chloride |
|
No |
No |
|
Chloroform |
|
No |
No |
|
Methyl bromide |
100 ppm |
+ |
Yellow |
|
Tetrachloroethylene |
|
No |
No |
|
1,1,1-Trichloroethane |
100 ppm |
+ |
Yellow |
|
Trichloroethylene |
|
No |
No |
|
|
|
|
Other substance
measurable with this
detector tube |
|
Substance |
Correction Factor |
No. of pump strokes |
Measuring Range |
|
Chloropicrin |
1.0 |
1 |
25 to 60 % |
|
|
Calibration gas generation |
Diffusion tube method |
|
TLV-TWA |
TLV-STEL |
Explosive range |
|
5 ppm |
10 ppm |
- |
|
|
|
|
|
|
Gastec Tubes and
Sampling Pump
