Gastec 230 甲基碘检测管CH3I(0.5~108ppm)

Indicator: 2 to 20ppm 
Measuring Range: 
+ 0.5 to 1ppm, Number of Pump Strokes 4
+ 1 to 20ppm , Number of Pump Strokes 2
+ 20 to 46ppm , Number of Pump Strokes 1
+ 46 to 108ppm, Number of Pump Strokes 1/2
Sampling Time: 1.5 minute per pump stroke
Colour Change: White → Gray
Reaction Principle: CH3I + I2O5 + V2O5 + H2SO4 → I2
Coefficient of Variation: 5% (for 1 to 20ppm)
Nr. of tests: 10
Pump: GV-100S/110S

Detail

Catalog

Manual

Performance
Measuring Range 0.5 to 1ppm 1 to 20ppm 20 to 46ppm 46 to 108ppm
Number of Pump Strokes 4 2 1 1/2
Correction Factor 0.5 1 2.3 5.4
Sampling Time 1.5 minutes per pump stroke
Detecting Limit 0.2ppm (n=4)
Colour Change White → Gray
Reaction Principle CH3I + I2O5 + V2O5 + H2SO4 → I2
I2 + 3,3,5,5-Tetramethylbenzidine 「ェ Reaction Products
Coefficient of Variation 5% (for 1 to 20ppm)
Shelf Life 2 Year
Corrections for temperature & humidity Temperature correction is necessary
Store the tubes in the refrigerator to keep at 10ºC (50ºF) or below.
Possible coexisting substances and their interferences (NOTE)
Substance Concentration Interference Change colour by itself to
Chlorine 1/1 + (Two layers) Brown (turns pale blue after a few minutes)
Nitrogen dioxide 1/1 (Two layers) Pink
Methyl bromide 30 ppm No No
Dichloromethane 50 ppm No No
Carbon dioxide 1% No No
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
2 ppm (2014) - -
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