Isopropyl alcohol CH3CH(OH)CH3
(i-C3H7OH)		 NO.113


Performance

Measuring Range

0.02 to 0.04%

0.04 to 2.5%

2.5 to 5.0%

Number of Pump Strokes

2

1

1/2

Correction Factor

1/2

1

2

Sampling Time

3 minutes per pump stroke

Detecting Limit

0.004% (n=2)

Color Change

Pink Pale Blue

Reaction Principle

Isopropyl alcohol reduces potassium dichromate to form
chromic sulfate, which is pale blue in color
(CH3)2CHOH + K2Cr2O7 + H2SO4 Cr2(SO4)3
Coefficient of Variation

15% (for 0.04 to 0.5 %), 10% (for 0.5 to 2.5 %)
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

Other alcohols

 -

Plus error

Produce similar stain by themselves

Carbon dioxide

 -

No effect

No discoloration

Carbon monoxide

 -

No effect

No discoloration


Other substance measurable with this detector tube

Substance

Correction Factor

 No. of pump stroke

Measuring Range

Propyl alcohol

1

 1

0.04 to 2.5 ppm


Calibration gas generation Diffusion tube method


TLV-TWA TLV-STEL Explosive range
400ppm 500ppm 2 to 12.7%


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