甲醛HCHO氣體測毒管171SC FORMALDEHYDE 0.05-4.0ppm

Tube 71SC

1. PERFORMANCE
1） Measuring range ：0.1-4.0 ppm 0.05-2.0 ppm
Number of pump strokes 5（500mr） 10（1000ml）
2） Sampling time ：5 minutes/5 pump strokes
3） Detectable limit ：0.03 ppm（1000ml）
4） Shelf life ：1 year （Necessary to store in a refrigerated place ; 0～10℃）
5） Operating temperature ：10～40℃
6） Temperature compensation ：Necessary（See "TEMPERATURE CORRECTION TABLE"）
7） Reading ：Direct reading from the scale calibrated by 5 pump strokes
8） Colour change ：Yellow→Pink
2. RELATIVE STANDARD DEVIATION
RSD-low：10％　RSD-mid.：10％　RSD-high：10％
3. CHEMICAL REACTION
By reaction with Hydroxylamine phosphate acid is liberated and PH indicator is discoloured.
HCHO＋（NH3OH）3?H3PO4→H3PO4＋HCH＝NOH＋H2O
4. CALIBRATION OF THE TUBE
COLOURIMETRY METHOD
5. INTERFERENCE AND CROSS SENSITIVITY
GAS To pump
4.0
3.0
2.0
1.0
0.1
0.5
0.3
500ml
ppm
（White）
DEHUMIDIFIER
171SC FORMALDEHYDE
Substance ppm Interference ppm Coexistence
Ammonia
The accuracy of readings is 10 Lower readings are given. Inlet
not affected. side is faded the discoloured layer.
Higher readings are given. The
Nitrogen dioxide 3 Similar stain is produced. 3 top of discoloured layer becomes
unclear.
Acetaldehyde 〃Higher readings are given.
Toluene
The accuracy of readings is
not affected.
TEMPERATURE CORRECTION TABLE
Tube Corrected Concentration （ppm）
Readings 10℃ 20℃ 30℃ 40℃
（ppm） （50°F） （68°F） （86°F） （104°F）
4.0 6.4 4.0 2.4 1.6
3.5 5.6 3.5 2.1 1.4
3.0 4.8 3.0 1.8 1.2
2.5 4.0 2.5 1.5 1.0
2.0 3.2 2.0 1.2 0.8
1.5 2.4 1.5 0.9 0.6
1.0 1.6 1.0 0.6 0.4
0.5 0.8 0.5 0.3 0.2
0.3 0.5 0.3 0.18 0.12
0.1 0.16 0.1 0.06 0.04
（NOTE）
In case of 10 pump strokes, following formula is available for the actual concentration.
Actual concentration ＝ 1/2 × Tmperature corrected value