|
|
| Performance |
Measuring
Range
|
2 to 500 ppm |
Sampling Hours
|
1 to 10 hours |
Detecting Limit
|
2ppm (10 hours) |
Color Change
|
White --->
Brown |
| Reaction
Principle |
Toluene react with
formaldehyde to form condensation polymer, which is brown in color. |
| Coefficient
of Variation |
10% (for 20 to
500 ppm-hr) |
| Shelf
Life |
2 Years |
| Corrections
for temperature & humidity |
Temperature correction
is necessary |
| Store the
tubes at cool and dark place. |
| Possible
coexisting substances and their interferences |
Substance
|
Interference |
Change
color by itself |
Aromatic HCs
|
Plus error
|
Produce yellow
stain |
Alcohols, Ketones, Esters
|
No effect(30ppm)
|
No stain |
| Other
substance measurable with this detector tube |
Substance
|
Correction
Factor
|
Sampling
time
|
Measuring
Range |
Xylene
|
1.7
|
1 to 10 hours
|
3.4 to 850 ppm |
Ethyl benzene
|
1.4
|
1 to 10 hours
|
2.8 to 700 ppm |
| Cumene |
1.7 |
1 to 10 hours |
3.4 to 850 ppm |
| Benzene |
1.2 |
1 to 10 hours |
2.4 to 600 ppm |
| Calibration
gas generation |
Permeation tube method |
TLV-TWA
|
TLV-STEL
|
Explosive
range |
| 50ppm |
- |
1.4 to 6.7% |
|
