Formaldehyde |
NO.91P |
| HCHO |  |
 |
Specifications
| Calibration Range | 0.02-0.4 ppm |
| Measuring range | 0.02-1.44 ppm |
| Sampling (flow) Rate | 200mL/min |
| Sampling Volume | 6000mL, 2000mL |
| Sampling Time | 30min, 10min. |
| Detecting Limit | 0.01 ppm |
| Colour Change | Yellow → pink |
| Corrections for temperature/humidity | Temperature |
| Shelf life | 1 year (in the refrigerator) |
| Accuracy | CV=5-10% (CV: Coefficient of variation = σ: standard deviation / mean value x 100) |
Possibly coexisting substances and their interferences (NOTE)
| Substance(s) | Interference | Colour change by itself |
| Ammonia | 2 ppm (or less) | No | No |
| Nitrogen dioxide | 1 ppm (or less) | No | No |
| Acetaldehyde | "+" error (higher reading) |
produces pinkish discolouration | |
| Acetone | 0.3 ppm (or less) | No | Produces pinkish stain around tube opening (inlet) |
| Ethanol | No | No | |
| Ethyl acetate | No | No | |
| p-dichlorobenzene | No | No | |
| Toluene | No | No | |
Scrubber 1 (black): removes acetone Scrubber 2 (purple): Ammonia and nitrogen dioxide are removed. The presence of ammonia causes the purple scrubber 2 to turn yellow. The presence of nitrogen dioxide causes scrubber 2 to turn a darker shade of purple |
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| Calibration gas generation | Diffusion tube method (analysis: by absorptiometry, acetylacetone method) |
Miscellaneous
| Electric sampling pump This detector tube is suited for measuring formaldehyde in indoor environments. The GSP-200 / GSP-300FT series automatic gas samplers (or comparable sampling devices/pumps) should always be used for optimal performance. A deviation of +/-10% in the sampling flowrate (i.e. amount of air flowing through the tube at a given moment) or the sampling amount (total sampled amount of target substance) causes an average margin of error of approx. +/-10% (maximum +/-20%) in the indicated value. Formaldehyde indoor concentration threshold: 0.08 ppm (mean value during 30 minutes) |
| TLV-TWA | TLV-STEL | Explosive range |
| -- -- | C0.3ppm | 7.0กม73% |
