氮氧化物NO+NO2气体检测管175SA NITROGEN OXIDES 20-250ppm 返回列表页

氮氧化物NO+NO2气体检测管175SA NITROGEN OXIDES 20-250ppm

Tube 75SA

1. PERFORMANCE
1） Measuring range ：20-250 ppm
Number of pump strokes 1（100ml）
2） Sampling time ：1 minute/1 pump stroke
3） Detectable limit ：2 ppm
4） Shelf life ：1 year
5） Operating temperature ：5～45℃
6） Reading ：Direct reading from the scale calibrated by 1 pump stroke
7） Colour change ：White→Yellow
2. RELATIVE STANDARD DEVIATION
RSD-low：10％　RSD-mid.：5％　RSD-high：5％
3. CHEMICAL REACTION
NO ; By reacting with an Oxidizer, NO2 is produced.
NO＋CrO3＋H2SO4→NO2
NO2＋（C6H5）2NH→（C6H5）2NNO
NO2 ; By reacting with Diphenylamine, N-Nitroso-diphylamine is produced.
NO2＋（C6H5）2NH→（C6H5）2NNO
4. CALIBRATION OF THE TUBE
NO ; STANDARD GAS CYLINDER METHOD
NO2 ; PERMEATION TUBE METHOD
5. INTERFERENCE AND CROSS SENSITIVITY
20
40
60
80
100
150
200
250
ppm
100ml
GAS To pump
PRETREAT REAGENT
（Reddish brown）
175SA NITROGEN OXIDES
Substance ppm Interference ppm Coexistence
Over 600 Dark blue stain is produced.
Hydrogen chloride Over 1,000 Brownish red/Yellow/Dark blue Lower readings are given.
stain is produced.
Sulphur dioxide 100 〃