Formaldehyde Detection Tubes (0.1 to 40 ppm)

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Item #: 91L
MFG: GasTec

UOM: Box of 10

$80.95 Was: $91.91
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Formaldehyde Detection Tubes (0.1 to 40 ppm)

Measures Formaldehyde with a Range of 0.1 to 40 ppm.

  • Measuring Range:
    • 0.1 to 5 ppm - 5 Pump Strokes
      Correction Factor: 1
    • 5 to 40 ppm - 1 Pump Stroke
      Correction Factor: 8
  • Sampling Time: 1.5 minutes per pump stroke
  • Detecting Limit: 0.05 ppm (5 pump strokes)
  • Changes from Yellow to Reddish Brown
  • Corrections for temperature & humidity: Temperature correction is necessary
  • Relative Standard Deviation: 10% (for 0.1 to 0.5 ppm), 5% (for 0.5 to 5 ppm)
  • 3 Year Shelf Life
  • Reaction Principle:
    • 3HCHO + (NH2OH)3H3PO4 → H3PO4
    • H3PO4 + Base → Phosphate
  • Store the tubes in the refrigerator to keep at 10ºC (50ºF) or below.

Possible coexisting substances and their interferences:

Substance Interference Changes color by itself to
Aldehydes, Ketones + Reddish brown
Acid gases + Red
Organic acids No No

Other substance measurable with this detector tube:

Substance: Correction Factor: No. of Pump Strokes: Measuring Range:
Benzaldehyde by scale 1 4 to 92 ppm
Cyclohexanone by scale 1/2 10 to 470 ppm
Diisobutyl ketone 5.8 4 0.58 to 29 ppm
Methaldehyde 0.65 3 0.065 to 3.25 ppm
Propionaldehyde 7.6 1 0.76 to 38 ppm