Methylene chloride CH2Cl2 NO.138


Performance

Measuring Range

20 to 50 ppm

50 to 500 ppm

Number of Pump Stroke

2

1

Correction Factor

0.4

1

Sampling Time

3 minutes per pump stroke

Detecting Limit

10 ppm (n=2)

Color Change

White Pale Pink

Reaction Principle

CH2:Cl2 + CrO3 + H2S2O7 Cl2
Cl2+ 3,3,5,5-Tetramethylbenzidine Holoquinone
Coefficient of Variation

15% (for 50 to 100 ppm), 10% (for 100 to 500 ppm)
Shelf Life 3 Years
Corrections for
temperature & humidity		 Temperature correction is necessary
Store the tubes at cool and dark place.


Possible coexisting substances and their interferences (NOTE)

Substance

Concentration

Interference

Change color by itself

Cl2, Br2, I2

 -

Plus error

Discolors pale pink

Unsaturated halogenated HCs

 -

Plus error

Discolors pale pink

Saturated halogenated HCs

 -

Plus error

Discolors pale pink



Other substance measurable with this detector tube

Substance

Correction Factor

Pump Strokes

Measuring Range

Ethyl Chloride

0.3

1

15 to 150 ppm


Calibration gas generation Diffusion tube method


TLV-TWA TLV-STEL Explosive range
50ppm - 15.5 to 66.9%


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