Formaldehyde Detection Tubes (0.05 to 1.0 ppm)

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Item #: 91LL
MFG: GasTec
UOM: Box of 10
Min Order: 0
Order Qty: Must order in multiples of 1
$78.79 Was: $89.73
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Product Details

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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