Gastec 1La Quick-measuring Detector tubes Carbon monoxide CO (8~1000ppm)

Manufacturer: Gastec
Model: 1La
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Specifications
Manufacturer Info

Indicator: 25~500ppm
Measuring Range:
+ 8 to 12.5 ppm, Number of Pump Strokes 3
+ 12.5 to 25 ppm, Number of Pump Strokes 2
+ 25 to 500 ppm, Number of Pump Strokes 1
+ 500 to 1000 ppm, Number of Pump Strokes 1/2
Sampling Time: 2 minutes per pump stroke
Colour Change: Yellow → Blackish brown
Reaction Principle: CO + Na2Pd(SO3)2 → Pd + CO2 + SO2+Na2SO3
Coefficient of Variation: 10% (for 25 to 100 ppm), 5% (for 100 to 500 ppm)
Nr. of tests: 10
Pump: GV-100S/110S

Details

Performance

Measuring Range

8 to 12.5 ppm

12.5 to 25 ppm

25 to 500 ppm

500 to 1000 ppm

Number of Pump Strokes

Correction Factor

Sampling Time

2 minutes per pump stroke

Detecting Limit

2 ppm (n=3)

Colour Change

Yellow → Blackish brown

Reaction Principle

CO + Na2Pd(SO3)2 → Pd + CO2 + SO2+Na2SO3

Coefficient of Variation

10% (for 25 to 100 ppm), 5% (for 100 to 500 ppm)

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 colour by itself to

Acetylene	1/50 time	+	Blackish brown
Ethylene	2000 ppm	No	Few minutes later, whole layer turns to brown.
Hydrogen	5000 ppm	+	Blackish brown (whole layer)(1%)
sulphur dioxide	1/10 time	+	Blackish brown
Nitrogen dioxide	40 ppm	+	Red (60 ppm)
Carbon disulphide	1/50 time	+	Blackish brown
Halogens	1/5 time	+	Blackish brown
Mercaptans	1/5 time	+	Blackish brown
Hydrogen sulphide	1/5 time	+	Blackish brown