Gastec 233 快速肼测量探测管N2H4(0.045~22ppm)

Indicator: 0.5 to 10 ppm
Measuring Range: 
+ 0.045 to 0.1 ppm, Number of Pump Strokes 2
+ 0.1 to 10 ppm, Number of Pump Strokes 1
+ 10 to 22 ppm, Number of Pump Strokes 1/2
Sampling Time: 2 minute per pump stroke
Colour Change: White → Yellow
Reaction Principle: 
+ CCl3NO2 + I2O5 + H2S2O7 → COCl2
+ COCl2 + (CH3)2NC6H4CHO → (CH3)2NC6H4CHCl2 + CO2
+ (CH3)2NC6H4CHCl2 + (C6H5)2NH→ Reaction product
Coefficient of Variation: 10% (for 0.1 to 3.0 ppm), 5% (for 3.0 to 10.0 ppm)
Nr. of tests: 5
Pump: GV-100S/110S

Detail

Catalog

Manual

Performance
Measuring Range 0.045 to 0.1 ppm 0.1 to 10 ppm 10 to 22 ppm
Number of Pump Strokes 2 1 1/2
Correction Factor 0.45 1 2.2
Sampling Time 2 minutes per pump stroke
Detecting Limit 0.03 ppm (n=2)
Colour Change White → Yellow
Reaction Principle

CCl3NO2 + I2O5 + H2S2O7 → COCl2
COCl2 + (CH3)2NC6H4CHO → (CH3)2NC6H4CHCl2 + CO2
(CH3)2NC6H4CHCl2 + (C6H5)2NH→ Reaction product

Coefficient of Variation 10% (for 0.1 to 3.0 ppm), 5% (for 3.0 to 10.0 ppm)
Shelf Life 1 Year
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
Ammonia   No No discolouration
Carbon Dioxide   No No discolouration
Carbon Monoxide 10ppm No discolouration
Ethylene Oxide   No No discolouration
Formaldehyde   No No discolouration
Hydrogen Cyanide   No No discolouration
Bromomethane 2ppm + Yellow ( 2 ppm)
Phosphine   No No discolouration
Sulphuryl Fluoride   No No discolouration
1,2-Dichloroethane   No No discolouration
Benzene   No No discolouration
Toluene   No No discolouration
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
0.1 ppm(2013) - -

 

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