Hydrogen sulfide H2S NO.4HP
4HP


Performance

Measuring Range

0.25 to 0.5%

0.5 to 10 %

10 to 20 %

Number of Pump Strokes

2

1

1/2

Correction Factor

1/2

1

2

Sampling Time

3 minutes per pump stroke

Detecting Limit

0.1% (n=2)

Color Change

Pale Blue Blackish Brown

Reaction Principle

Hydrogen sulfide reacts with cupric sulfate to form
cupric sulfide, which is blackish brown.
Coefficient of Variation 10% (for 0.5 to 3 %), 5% (for 3 to 10 %)
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

Ammonia

 -

Produces blackish brown and dark blue color

Produces dark blue stain

Sulfur dioxide

2.5%

Minus error

No discoloration

Mercaptans

5 %

Plus error

No discoloration


Calibration gas generation High pressure gas cylinder method


TLV-TWA TLV-STEL Explosive range
10ppm 15ppm 4.0 to 44%

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