甲醛HCHO氣體檢知管171SB FORMALDEHYDE 1-35ppm

Tube 71SB
1. PERFORMANCE
1） Measuring range ：1-35 ppm
Number of pump strokes ：3（300ml）
2） Sampling time ：3 minutes/3 pump strokes
3） Detectable limit ：0.5 ppm
4） Shelf life ：3 years
5） Operating temperature ：0～40℃
6） Reading ：Direct reading from the scale calibrated by 3 pump strokes
7） Colour change ：White→Brownish orange
2. RELATIVE STANDARD DEVIATION
RSD-low：15％　RSD-mid.：15％　RSD-high：15％
3. CHEMICAL REACTION
By reacting with Aromatic compounds, a polymer is produced.
4. CALIBRATION OF THE TUBE
COLOURIMETRY METHOD
5. INTERFERENCE AND CROSS SENSITIVITY
GAS To pump
DETECTOR TUBE
（White）
PRETREAT TUBE
35
30
25
20
15
10
7 5 3
1
ppm
171SB FORMALDEHYDE
Substance Interference ppm Coexistence
Styrene Similar stain is produced. Higher readings are given.
Trichloroethylene 500 〃
Ethyl acetate 1,000 〃
Ether 1,000 〃
Acetaldehyde Similar stain is produced. 1 〃
HCHO＋　 ＋H2SO4 n＋H2O
C
H
H