Formaldehyde Detection Tubes (0.05 to 1.0 ppm)
Gastec Detection Tube No. 91LL measures Formaldehyde with a Range of 0.05 to 1.0 ppm.
- Measuring Range: 0.05 to 1.0ppm
- Pump Strokes: 5 (500 ml)
- Correction Factor: 1
- Sampling Time: 1.5 minutes per pump stroke
- Detecting Limit: 0.03 ppm (5 pump strokes)
- Changes from Yellowish Brown to Pale Pink
- Reaction Principle:
- 3HCHO + (NH2OH)3H3PO4 → H3PO4
- H3PO4 + Base → Phosphate
- Relative Standard Deviation: 10% (for 0.05 to 0.3 ppm), 5% (for 0.3 to 1.0 ppm)
- 1 Year Shelf Life (in the refrigerator)
- Store the tubes in the refrigerator to keep at 10ºC (50ºF) or below.
Possible coexisting substances and their interferences:
| Substance |
Concentration |
Interference |
Changes color by itself to |
| Ammonia |
|
- |
Yellow
(Unclear demarction) |
| Nitrogen dioxide |
|
No |
Pale pink |
| Aldehydes |
≧ 1/3 |
+
Unclear demarcation |
Pale pink
(Unclear demarcation) |
| Ketones |
≧ 1/1 |
+
Unclear demarcation |
Pale pink
(Unclear demarcation) |
| Toluene |
≦ 10 ppm |
No |
No |
Formaldehyde Detection Tubes (0.05 to 1.0 ppm)
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