Gastec 122DL 甲苯被动发现管C6H5CH3（2~500 ppm）

制造商: Gastec
Model: 122DL
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技术规格
制造商消息

Indicator: 20 ~ 500 ppm
Measuring Range: 2 ~ 500 ppm
Sampling Hours: 1 to 10 hours
Colour Change: White → Brown
Coefficient of Variation: 10% (20 ~ 500 ppm-hr)
Nr. of tests: 10

Details

Performance

Measuring Range	2 to 500 ppm
Sampling Hours	1 to 10 hours
Detecting Limit	1 ppm (10 hours)
Colour Change	White → Brown
Reaction Principle	Toluene react with formaldehyde to form condensation polymer, which is brown in colour.
Coefficient of Variation	10% (for 20 to 500 ppm-hr)
Shelf Life	2 Years
Corrections for temperature & humidity	Unnecessary
Store the tubes at cool and dark place.

Possible coexisting substances and their interferences (NOTE)

Substance

Concentration

Interference

Change colour by itself to

Aromatic hydrocarbons		+	Brown
Alcohols, Ketones, Esters	30ppm	No	No

Other substance measurable with this detector tube

Substance

Correction Factor

Sampling Time

Measuring Range

Xylene	Factor: 1.7	1 to 10	3.4 to 850 ppm
Ethyl benzene	Factor: 1.4	1 to 10	2.8 to 700 ppm
Cumene	Factor: 1.7	1 to 10	3.4 to 850 ppm
Benzene	Factor: 1.2	1 to 10	2.4 to 600 ppm
Stylene	Factor: 13	1 to 10	26 to 6500 ppm