Gastec 11S 氮氧化物气体检测管 NO + NO2(5~625ppm)

Indicator: 20 to 250 ppm
Measuring Range: 
+ 5 to 10 ppm, Number of Pump Strokes 2
+ 10 to 250 ppm, Number of Pump Strokes 1
+ 250 to 625 ppm, Number of Pump Strokes 1/2
Sampling Time: 45 seconds per pump stroke
Colour Change: White → Pale green
Reaction Principle: NO + Cr6+ + H2SO4 →NO2, NO2 + (C6H5)2NH → Pale green product
Coefficient of Variation: 10% (for 10 to 40 ppm), 5% (for 40 to 250 ppm)
Nr. of tests: 10
Pump: GV-100S/110S

Detail

Catalog

Manual

Manual tube

Performance
Measuring Range
5 to 10 ppm 10 to 250 ppm 250 to 625 ppm
Number of Pump Strokes
2 1 1/2
Correction Factor
1/2 1 2.5
Sampling Time 45 seconds per pump stroke
Detecting Limit 2 ppm (n=2)
Colour Change White → Pale green
Reaction Principle NO + Cr6+ + H2SO4 →NO2
NO2 + (C6H5)2NH → Pale green product
Coefficient of Variation 10% (for 10 to 40 ppm), 5% (for 40 to 250 ppm)
Shelf Life 2 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 colour by itself to
Hydrogen chloride 50 ppm Unclear demarcation Bluish purple (10 ppm)
Ozone 80 ppm Unclear demarcation
(two layers)
Pale brown
sulphur dioxide,
Hydrogen sulphide
1/1 + No
Methanol 400 ppm No
Calibration gas generation Permeation tube method
TLV-TWA TLV-STEL Explosive range
NO2: 0.2 ppm(2014)
NO: 25 ppm(2014)
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