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甲基碘CH3I氣體檢測管176S METHYL IODIDE 2-40ppm,Measuring range :4-40 ppm 2-20 ppm,碘化鉀/碘甲烷氣體檢測管,國家標準,中國職業(yè)接觸限值(GBZ 2—2002)Z高容許濃度(MAC)時(shí)間加權平均容許濃度(TWA)10 mg/m3,短時(shí)間接觸容許濃度(S)25 mg/m3,www.yd666.com
更新時(shí)間:2024-07-14
在線(xiàn)留言甲基碘CH3I氣體檢測管176S METHYL IODIDE 2-40ppm
Tube 76S
1. PERFORMANCE
1) Measuring range :4-40 ppm 2-20 ppm
Number of pump strokes 2(200ml) 4(400ml)
2) Sampling time :4 minutes/2 pump strokes
3) Detectable limit :0.5 ppm(400ml)
4) Shelf life :8 months
5) Operating temperature :10~40℃
6) Temperature compensation :Necessary(See "TEMPERATURE CORRECTION TABLE")
7) Reading :Direct reading from the scale calibrated by 2 pump strokes
8) Colour change :White→Grey
2. RELATIVE STANDARD DEVIATION
RSD-low:10% RSD-mid.:10% RSD-high:10%
3. CHEMICAL REACTION
Iodine pentoxide is reduced.
CH3I+I2O5+H2SO4→I2+CO2+H2O
4. CALIBRATION OF THE TUBE
GAS CHROMATOGRAPHY
5. INTERFERENCE AND CROSS SENSITIVITY
40
35
30
25
20
15
10
468
ppm
GAS To pump
(Yellow)
PRETREAT TUBE DETECTOR TUBE
176S METHYL IODIDE
Substance Interference ppm Coexistence
Acetone Similar stain is produced. 700 Higher readings are given.
Hydrogen sulphide FIG.1 〃7 〃
Hexane FIG.2 〃500 〃
Benzene 2 Lower readings are given.
Toluene 2 〃
Xylene 2 〃
Halogenated hydrocarbons Double-layer stain is produced and
accurate readings are affected.
0
30
20
Hydrogen sulphide〔ppm〕?
FIG.1 Influence of Hydrogen sulphide
Methyl iodide
indicating value 〔ppm〕
510 15 20 25 3035
10
0
20
Hexane〔ppm〕?
FIG.2 Influence of Hexane
Methyl iodide
indicating value 〔ppm〕
500 1000 1500 2000 2500
10
TEMPERATURE CORRECTION TABLE
Scale True Concentration (ppm)
Readings 0℃ 10℃ 20℃ 30℃ 40℃
(ppm) (32°F) (50°F) (68°F) (86°F) (104°F)
40 - - 40 46 52
35 - 52 35 42 49
30 54 39 30 37 44
25 37 27 25 25 23
20 30 22 20 23 30
15 24 17 15 17 24
10 17 11 10 12 17
5 10 5 5 5 10
(NOTE)
In case of 4 pump strokes, following formula is available for the actual concentration.
Actual concentration = 1/2 × Tmperature corrected value
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