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日本GASTEC 甲苯检测管122DL

详细介绍

甲苯C6H5CH3检测管122DL
甲苯C6H5CH3检测管122DL，GASTEC甲苯C6H5CH3检测管122DL检测范围2-500ppm，检测管检测时间在1-10小时左右。甲苯C6H5CH3检测管122DL 采用自然扩散的方式。甲苯C6H5CH3检测管122DL其特点：简洁，轻巧，方便多用、直接读数、不需取样设备。

被动扩散式检测管是用来测定较长时间下气体浓度的时量平均值（TWA），采用自然扩散的方式。
这种检测管里面填充有吸附剂及反应剂，气体以一定的速率被均匀吸附，从而出现较为明显均匀的变色

检测工作场所人员的有害气体暴露量时，用右图的检测管夹（710）放置在人员衣领处即可。
检测有害气体在工作场所的分布时，把该检测管固定放置一段时间后就可检测出来。也可用来进行更长时间的检测

Toluene

22DL

C6H5CH3

Performance

Measuring Range	2 to 500 ppm
Sampling Hours	1 to 10 hours
Detecting Limit	2 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	Temperature correction is necessary
Store the tubes at cool and dark place.

Possible coexisting substances and their interferences

Substance

Concentration

Interference

Change colour by itself to

Aromatic hydrocarbons		+	Brown
Alcohols, Ketones, Esters	亝 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