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Nextteq Detector Tubes
SCALE
Short Term
NEXTTEQ
Pump
GAS
1. PERFORMANCE
1) Measuring range : 20-1,000 ppm
Number of pump strokes : 1 (100mL)
2) Sampling time : 1.5 minutes / 1 pump stroke
3) Detectable limit : -
4) Shelf life : 2 years
5) Operating temperature : 15~25°C
6) Reading : Graduations printed on the tube are calibrated by Methyl Ethyl Ketone at 1 pump
stroke and Diisobutyl Ketone concentration is determined by using a conversion
chart
at 1 pump stroke
7) Color change : Yellow→Pale blue
2. RELATIVE STANDARD DEVIATION
RSD-low: 10% RSD-mid.: 10% RSD-high: 10%
3. CHEMICAL REACTION
Chromium Oxide is reduced.
[(CH3) 2CHCH2]2CO+Cr6++H2SO4→Cr3+
4. CALIBRATION OF THE TUBE
GAS CHROMATOGRAPHY
5. INTERFERENCE AND CROSS SENSITIVITY
Substance Interference Coexistence
Alcohols Similar or Brown stain is produced. Higher readings are given.
Esters " "
Ketones " "
Aromatic Hydrocarbons " "
Halogenated Hydrocarbons
Whole reagent is changed to Brown,
but if the maximum end point of the
Pale blue stain is discernable, the
accuracy of reading is not affected.
Aliphatic Hydrocarbons "
*METHYL ETHYL KETONE TUBE
Diisobutyl Ketone Concentration(ppm)
NX184L tube reading(ppm)
20 50 100 200 500 1000
2050100 200 500 1000 1500
(100mL)
DIISOBUTYL KETONE
Tube No. NX184L*
(CH3CH(CH3)CH2)2CO