o-Cresol C6H4(CH3)OH NO.61


Performance

Measuring Range

0.4 to 1 ppm

1 to 25 ppm

25 to 62.5 ppm

Number of Pump Strokes

4

2

1

Correction Factor

0.4

1

2.5

Sampling Time

1.5 minutes per pump stroke

Detecting Limit

0.1 ppm (n = 4)

Color Change

Pale yellow Gray

Reaction Principle

Cresol react with Ceric Ammonium Nitrate to form
a condensation polyer which color is brown
C6H5(CH3)OH + Ce(NO3)62－ C6H5O(CH3)Ce(NO3)52-
Coefficient of Variation

15% (for 1 to 5 ppm), 10% (for 5 to 25 ppm)
Shelf Life 2 Years
Corrections for
temperature & humidity		 Temperature correction is necessary
Store the tubes in the refrigerator to keep at 10oC (50oF) or below.


Possible coexisting substances and their interferences (NOTE)

Substance

Concentration

Interference

Change color by itself

Ammonia

2000 ppm

Plus error
(faint demarcation)

Produce white stain

Amines

2000 ppm

Phenol

 -

Plus error

Produce gray stain


Other substance measurable with this detector tube

Substance

Correction Factor

Pump Strokes

Measuring Range

m-Cresol

1.0

2

1 to 25 ppm

p-Cresol

1.0

2

1 to 25 ppm


Calibration gas generation Diffusion tube method


TLV-TWA TLV-STEL Explosive range
5ppm - -

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