Xylene C6H4(CH3)2 NO.123


Performance

Measuring Range

5 to10 ppm

10 to 250 ppm

250 to 625 ppm

Number of Pump Strokes

2

1

1/2

Correction Factor

1/2

1

2.5

Sampling Time

1.5 minute per pump stroke

Detecting Limit

1 ppm (n=2)

Color Change

White Brown

Reaction Principle

Xylene reacts with iodine pentoxide to
liberate iodine to produce brown color.
C6H4(CH3)2 + I2O5 + H2SO4 I2
Coefficient of Variation

10% (for 10 to 50 ppm), 5% (for 50 to 250 ppm)
Shelf Life 3 Years
Corrections for
temperature & humidity		 Unnecessary
Store the tubes at cool and dark place.


Possible coexisting substances and their interferences (NOTE)

Substance

Concentration

Interference

Change color by itself

Carbon Monoxide

1000ppm

2 layers

Discolors pale brown
(Whole layer)

Acetylene,Hexane

2000 ppm

 2 layers

Discolors pale brown
(Whole layer)

Toluene

1/5 time

Plus error

Discolors brown

Benzene

1/5 time

Plus error

Discolors pale yellow


Other substance measurable with this detector tube

Tube 123 Reading (n = 2)

10

20

50

100

Trimethylbenzene Conc. (ppm)

10

27

90

300


Calibration gas generation Diffusion tube method


TLV-TWA TLV-STEL Explosive range
100ppm 150ppm 1.0 to 7.0%

Copyright(c) 2001 GASTEC CORPORATION. All rights reserved.