甲醛HCHO气体检测管91D

扩散式气体检测管简单介绍
甲醛气体检测管91D HCHO，检测范围Measuring Range 0.1 to 20 ppm Sampling Hours 1 to 10 hours Detecting Limit 0.05 ppm (10 hours) 甲醛气体检测管价格，甲醛气体检测管91D HCHO

甲醛气体检测管91D HCHO的详细介绍
甲醛气体检测管91D HCHO Formaldehyd No.91D
HCHO

Performance

Measuring Range	0.1 to 20 ppm
Sampling Hours	1 to 10 hours
Detecting Limit	0.05 ppm (10hours)
Color Change	Yellow → ReddishBrown
Reaction Principle	3HCHO +(NH2OH)3H3PO4 →H3PO4 H3PO4 + Base+Phosphate
Coefficient ofVariation	10% (for 1 to 20 ppm-hr)
ShelfLife	1 Year
Correctionsfor temperature & humidity	Unnecessary
Store the tubes inthe refrigerator to keep at 10^oC (50^oF) orbelow.

Possible coexisting substances and theirinterferences

(NOTE)

Substance	Interference	Change colour byitself to
Aldehydes, Ketones,Acid gases	+	Reddishbrown

Othersubstance measurable with this detectortube

Substance	CorrectionFactor	SamplingTime	MeasuringRange
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 ethylketone	1.25	1 to 10 hours	0.125 to 25ppm

Calibration gasgeneration

Diffusion tubemethod

TLV-TWA	TLV-STEL	Explosive range
-	C 0.3ppm	7.0to 73%