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甲醛气体检测管91L Formaldehyde HCHO
Formaldehyde No.91L
HCHO
| Performance |
MeasuringRange | 0.1 to 5 ppm | 5 to 40 ppm |
Number of PumpStrokes | 5 | 1 |
CorrectionFactor | 1 | 8 |
SamplingTime | 1.5 minutes per pumpstroke | |
DetectingLimit | 0.05 ppm (n=5) | |
ColorChange | Yellow → ReddishBrown | |
ReactionPrinciple | 3HCHO +(NH2OH)3H3PO4 → H3PO4 | |
| Coefficient ofVariation | 10% (for 0.1 to 0.5ppm), 5% (for 0.5 to 5 ppm) | |
| ShelfLife | 3Years | |
| Correctionsfor temperature & humidity | Temperature correction is necessary | |
| Store the tubes inthe refrigerator to keep at 10oC (50oF) orbelow. | ||
| Possible coexisting substances and theirinterferences | (NOTE) |
Substance | Concentration | Interference | Change color by itself |
Aldehydes | - | Plus error | Produce reddish brownstain |
Ketones | - | Plus error | Produce reddish brownstain |
Acid Gases | - | Plus error | Produce redstain |
Organic acids | - | No effect | No stain bythemselves |
| Othersubstance measurable with this detector tube |
Substance | Correction Factor | No. of Pump strokes | Measuring range | |||||||
Diisobutylketone | 5.8 | 4 | 0.58 to 29 ppm | |||||||
Methaldehyde | 0.65 | 3 | 0.065 to3.25ppm | |||||||
Propionaldehyde | 7.6 | 1 | 0.76 to 38ppm | |||||||
91L Tube Reading(n=1) | 0.2 | 0.5 | 1 | 2 | 3 | 4 | 5 | |||
Benzaldehyde(ppm) | 2 | 4 | 9 | 22 | 40 | 63 | 92 | |||
91L Tube Reading(n=1/2) | 0.2 | 0.5 | 1 | 2 | 3 | 4 | 5 |
Cyclohexanone(ppm) | 10 | 30 | 60 | 130 | 220 | 330 | 470 |
| Calibration gasgeneration | Diffusion tubemethod | |
| TLV-TWA | TLV-STEL | Explosive range |
| - | C 0.3 ppm | 7.0 to 73% |