Formaldehyde Detection Tubes (8 to 6400 ppm)

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Item #: 91M
MFG: GasTec
UOM: Box of 10
Min Order: 0
Order Qty: Must order in multiples of 1
$86.93 Was: $93.27
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Product Details

Formaldehyde Detection Tubes (8 to 6400 ppm)

Gastec Detection Tube No. 91M measures Formaldehyde with a Range of 8 to 6400 ppm.

  • Measuring Range:
    • 8 to 20 ppm
    • 20 to 2000 ppm
    • 2000 to 6400
  • Pump Strokes: 2, 1, 1/2
  • Correction Factor: 0.4, 1, 3.2
  • Sampling time: 1 minute per pump stroke
  • Detecting Limit: 4 ppm (2 pump strokes)
  • Changes from Yellow to Red
  • Corrections for temperature & humidity: Temperature correction is necessary
  • Reaction Principle:
    • 3HCHO + (NH2OH)3H3PO4 → H3PO4
    • H3PO4 + Base → Phosphate
  • Relative Standard Deviation: 10% (for 20 to 500 ppm), 5% (for 500 to 2000 ppm)
  • 2 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
Acrolein ≧ 5 times + Red (≧ 20 ppm)
Acetaldehyde ≧ 1/6 + Red (≧ 3 ppm)

Formaldehyde Detection Tubes (8 to 6400 ppm)

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