Gasoline CnHm NO.101


Performance

Measuring Range

0.015 to 0.03％

0.03 to 0.6%

0.6 to 1.2%

Number of Pump Strokes

2

1

1/2

Correction Factor

1/2

1

2

Sampling Time

1 minute per pump stroke

Detecting Limit

0.003% (n = 2)

Color Change

Orange Dark green

Reaction Principle

Gasoline reduces potassium dichromate to form chromic sulfate,
which is dark green in color
CnHm + K2Cr2O7 + H2SO4 Cr2(SO4)3
Coefficient of Variation 10% (for 0.03 to 0.1 %), 5% (for 0.1 to 0.6 %)
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

Acetylene

3%

 Yes

Produce dark brown to whole layer

Propane

0.2%

 Yes

Produce dark brown to whole layer
(2%)

Aromatic HCs

500 ppm

Plus error

Produce dark green
(5000ppm)

Alcohols, Esters, Ethers

 -

Plus error

Produce dark green

Halogenated HCs.

5000 ppm

Plus error

Produce dark green
(5000ppm)

Hydrogen sulfide

500 ppm

Plus error

Produce dark green
(5000ppm)

Sulfur dioxide

500 ppm

Plus error

Produce green
(5000ppm)


Other substance measurable with this detector tube

Substance

Correction

No. of Pump Strokes

Measuring Range

Heptane

Factor: 1.0

1/2, 1 or 2

0.015 to 1.2%

Isooctane

Factor: 0.9

1

0.027 to 0.54%

Octane

Factor: 1.2

1

0.036 to 0.72%


Calibration gas generation Static gas dilution method


TLV-TWA TLV-STEL Explosive range
300ppm 500ppm 1.4 to 7.6%


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