Gastec 91D 甲醛被动发现管HCHO(0.1~20 ppm)

Indicator: 1 ~ 20 ppm
Measuring Range: 0.1 ~ 20 ppm
Sampling Hours: 1 to 10 hours
Colour Change: Yellow → Reddish Brown
Reaction Principle: 3HCHO + (NH2OH)3 H3PO4 → H3PO4, H3PO4 + Base+Phosphate 
Coefficient of Variation: 10% (1 ~ 20 ppm-hr)
Nr. of tests: 10

Detail

Catalog

Performance
Measuring Range 0.1 to 20 ppm
Sampling Hours 1 to 10 hours
Detecting Limit 0.05 ppm (10 hours)
Colour Change Yellow → Reddish Brown
Reaction Principle

3HCHO + (NH2OH)3 H3PO4 → H3PO4
H3PO4 + Base+Phosphate

Coefficient of Variation 10% (for 1 to 20 ppm-hr)
Shelf Life 1 Year
Corrections for temperature & humidity Unnecessary
Store the tubes in the refrigerator to keep at 10ºC (50ºF) or below.
Possible coexisting substances and their interferences (NOTE)
Substance Interference Change colour by itself to
Aldehydes, Ketones, Acid gases + Reddish brown
Other substance measurable with this detector tube
Substance Correction Factor Sampling Time Measuring Range
Acetaldehyde 1.0 1 to 10 hours 0.1 to 20 ppm
Furfural 3.0 1 to 10 hours 0.3 to 60 ppm
Methyl ethyl ketone 1.25 1 to 10 hours 0.125 to 25 ppm
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
- C 0.3 ppm 7.0 to 73%
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