乙醛氣體檢測管92 CH3CHO 的詳細介紹
乙醛氣體檢測管92 CH3CHO
Acetaldehyde                         No.92
CH3CHO

 
Performance
Measuring Range
5 to10 ppm
10 to 300 ppm
300 to 750 ppm
Number of Pump Strokes
4
2
1
Correction Factor
0.5
1
2.5
Sampling Time
2 minutes per pump stroke
Detecting Limit
2 ppm (n=4)
Colour Change
Yellow → Red
Reaction Principle
3CH3CHO + (NH2OH)3H3PO4 → H3PO4
H3PO4 + Base → Phosphate
Coefficient of Variation
10% (for 10 to 100 ppm), 5% (for 100 to 300 ppm)
Shelf Life
2 Years
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
Ammonia
 
-
No
Acrolein
3/5 times
+
Red
Acetone
2 times
+
Red
Methyl ethyl ketone
6 times
+
Red
MIBK
10 times
+
Red
Other substance measurable with this detector tube
Substance
Correction Factor
No.of pump strokes
Measuring Range
Diacetyl
by scale
3
25 to 1500 ppm
Calibration gas generation  Diffusion tube method
TLV-TWA
TLV-STEL
Explosive range
 
-
C 25 ppm
4 to 60%