Hydrogen cyanide HCN NO.12LL
12LL


Performance

Measuring Range

0.2 to 7 ppm

Number of Pump Strokes

2

Correction Factor

1

Sampling Time

2 minutes per pump stroke

Detecting Limit

0.05 ppm (n=2)

Color Change

Yellow Pink

Reaction Principle

Hydrogen cyanide reacts with mercuric Chloride to form
the hydrogen chloride then discolors the indicator to pink.
2HCN + HgCl2 Hg(CN)2+ 2HCl HCl + Base Chloride product
Coefficient of Variation 10% (for 0.2 to 2 ppm), 5% (for 3 to 7 ppm)
Shelf Life 2 Years
Corrections for
temperature & humidity		 Humidity 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

Hydrogen sulfide

1 ppm

Plus error

Red discoloration

Sulfur dioxide

1 ppm

Plus error

Red discoloration


Calibration gas generation Permeation tube method


TLV-TWA TLV-STEL Explosive range
- C 4.7 ppm 5.6 to 40%

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