Gastec 21LA Quick-measuring Detector tubes Carbonyl sulphide COS (2-125ppm)

Indicator: 5 to 50 ppm
Measuring Range:
+ 2 to 5 ppm, Number of Pump Strokes 2
+ 5 to 50 ppm, Number of Pump Strokes 1
+ 50 to 125 ppm, Number of Pump Strokes 1/2
Sampling Time: 3 minutes per pump stroke
Colour Change: Bluish Purple → White
Reaction Principle: COS + I2O5 + H2SO4 → SO2 + CO2, SO2 + I2 + H2O → 2HI + H2SO4
Coefficient of Variation: 10% (for 5 to 10 ppm), 5% (for 10 to 50 ppm)
Nr. of tests: 5
Pump: GV-100S/110S

Catalog

Manual

manual tube

	500 ppm	+(Black)	Black at 500ppm
sulphur dioxide, Carbon disulphide		+	White
Carbon dioxide		No	No
Nitrogen dioxide	2 ppm	+	Brown at 2ppm
Hydrogen sulphide	1000 ppm	No effect at 1 pump stroke	*1
Propane, Butane	10%	No	Black at the top of the discoloured area.
*1: If the primary tube is totally discoloured, the analyzer tube will be discoloured white due to the effect of hydrogen sulphide.