Gastec 121S 苯气体检测管 C6H6（2~312 ppm）

制造商: Gastec
Model: 121S
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技术规格
制造商消息

Indicator: 5 to 120 ppm
Measuring Range:
+ 2 to 5 ppm, Number of Pump Strokes 4
+ 5 to 120 ppm, Number of Pump Strokes 2
+ 120 to 312 ppm, Number of Pump Strokes 1
Sampling Time: 2 minute per pump stroke
Colour Change: White → Dark green
Reaction Principle: C6H6 + I2O5 + H2S2O7 → I2
Coefficient of Variation: 20% (for 5 to 40 ppm), 15% (for 40 to 120 ppm)
Nr. of tests: 5
Pump: GV-100S/110S

Details

Performance

Measuring Range

2 to 5 ppm

5 to 120 ppm

120 to 312 ppm

Number of Pump Strokes

Correction Factor

Sampling Time

2 minutes per pump stroke

Detecting Limit

0.5 ppm (n=4)

Colour Change

White → Dark green

Reaction Principle

C6H6 + I2O5 + H2S2O7 → I2

Coefficient of Variation

20% (for 5 to 40 ppm), 15% (for 40 to 120 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 colour by itself to

Hexane	100 ppm	No	No
Toluene	200 ppm	No	No
Xylene	300 ppm	No	No
Aromatic hydrocarbons other than benzene are trapped in the brown layer in the pretreatment tube. If the pretreatment reagent is entirely consumed (whole brown layer turns to dark brown), a higher reading will be given.