Gastec 131LB 快速偏二氯乙烯测量探测管 CH2：CCl2（0.25-70ppm）

Name: Gastec 131LB 快速偏二氯乙烯测量探测管 CH2：CCl2（0.25-70ppm）
Brand: Gastec

制造商Gastec(查看更多该品牌的产品)

Model131LB

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Indicator: 1 to 20 ppm
Measuring Range:
+ 0.25 to 1 ppm, Number of Pump Strokes 4
+ 1 to 20 ppm, Number of Pump Strokes 2
+ 20 to 70 ppm, Number of Pump Strokes 1
Sampling Time: 1.5 minute per pump stroke
Colour Change: Yellow → Purple
Reaction Principle: CH2:CHCl + PbO2 + H2SO4 → HCl, HCl + Base → Purple
Coefficient of Variation: 10% (for 1 to 5 ppm), 5% (for 5 to 20 ppm)
Nr. of tests: 10
Pump: GV-100S/110S

Catalog

Manual

Manual tube

Performance

Measuring Range

0.25 to 1 ppm

1 to 20 ppm

20 to 70 ppm

Number of Pump Strokes

Correction Factor

1/4

3.5

Sampling Time

1.5 minutes per pump stroke

Detecting Limit

0.05 ppm (n=4)

Colour Change

Yellow → Purple

Reaction Principle

CH2:CHCl + PbO2 + H2SO4 → HCl
HCl + Base → Purple

Coefficient of Variation

10% (for 1 to 5 ppm), 5% (for 5 to 20 ppm)

Shelf Life

2 Years

Corrections for temperature & humidity

Temperature correction is necessary

Store the tubes in the refrigerator to keep at 10ºC (50ºF) or below.

Possible coexisting substances and their interferences (NOTE)

Substance

Concentration

Interference

Change colour by itself to

Chlorine, Hydrogen chloride	≧ 1/10	+	Purple
Alcohols, Esters, Ketones		No	No
1,2-Dichloroethylene	≧ 1/10	+	Purple
Trichloroethylene, Tetrachloroethylene	≧ 1/10	+	Purple
Aromatic hydrocarbons		No	No

Calibration gas generation

Permeation tube method

TLV-TWA	TLV-STEL	Explosive range
1 ppm (2014)	-	3.6 to 23%

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