苯檢測(cè)管121 Benzene C6H6 的詳細(xì)介紹
苯檢測(cè)管121 Benzene C6H6

 
Benzene                        No.121C6H6
Performance
 
Measuring Range
2.5 to 5 ppm
5 to 60 ppm
60 to 120 ppm
Number of Pump Strokes
4
2
1
Correction Factor
1/2
1
2
Sampling Time
1.5 minutes per pump stroke
Detecting Limit
0.5 ppm (n=4)
Color Change
White → Dark Green
Reaction Principle
C6H5 + I2O5→ H2S2O7 + I2
Coefficient of Variation 10% (for 5 to 20 ppm), 5% (for 20 to 60 ppm)
Shelf Life 3 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 color by itself
Esters
2000 ppm
Plus error
No discoloration
Aromatic HCs
-
Plus error
Produce dark green stain
Other substance measurable with this detector tube
Substance
Correction
No. of Pump Strokes
Measuring Range
Diisobutylene
Factor: 9
1
45 to 540 ppm
α-Pinene
Factor 19
3
95 to 1140 ppm
Calibration gas generation Diffusion tube method

TLV-TWA TLV-STEL Explosive range
0.5ppm 2.5ppm 1.3 to 7.1%