Gastec 121SL 苯气体检测管 C6H6（1~100ppm）

制造商: Gastec
Model: 121SL
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技术规格
制造商消息

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

Details

Performance

Measuring Range

1 to 20 ppm

20 to 100 ppm

Number of Pump Strokes

Correction Factor

Sampling Time

2 minutes per pump stroke

Detecting Limit

0.25 ppm (n=5)

Colour Change

White → Dark Green

Reaction Principle

C6H6 + I2O5 + H2S2O7 → I2

Coefficient of Variation

20% (for 1 to 5 ppm), 15% (for 5 to 20 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	50 ppm	No	No
Toluene	100 ppm	No	No
Xylene	150 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.