Gastec 131La 氯乙烯气体检测管 CH2：CCl2（0.25~54 ppm）

制造商: Gastec
Model: 131La
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技术规格
制造商消息

Indicator: 1 to 20 ppm
Measuring Range:
+ 0.25 to 0.5 ppm, Number of Pump Strokes 4
+ 0.5~1ppm, Number of Pump Strokes 2
+ 1 to 20 ppm, Number of Pump Strokes 1
+ 20 to 54 ppm, Number of Pump Strokes 1/2
Sampling Time: 1 minute per pump stroke
Colour Change: Yellow → Reddish brown
Reaction Principle: CH2:CHCl + Cr6+ + H2SO4 → HCl, HCl+ Base → Chlorides
Coefficient of Variation: 10% (for 1 to 6 ppm), 5% (for 6 to 20 ppm)
Nr. of tests: 5
Pump: GV-100S/110S

Details

Performance

Measuring Range

0.25 to 0.5 ppm

0.5 to
1 ppm

1 to 20 ppm

20 to 54 ppm

Number of Pump Strokes

Correction Factor

Sampling Time

1 minute per pump stroke

45 seconds

Detecting Limit

0.05 ppm (n=4)

Colour Change

Yellow → Reddish brown

Reaction Principle

CH2:CHCl + Cr⁶⁺ + H2SO4 → HCl
HCl+ Base → Chlorides

Coefficient of Variation

10% (for 1 to 6 ppm), 5% (for 6 to 20 ppm)

Shelf Life

2 Years

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

Concentration

Interference

Change colour by itself to

Ethylene	0.1%		No
Tetrachloroethylene	3 times	+	Reddish brown
Trichloroethylene	1/2 time	+	Reddish brown
Toluene, Xylene	500 ppm		No
Benzene	400 ppm		No

Other substance measurable with this detector tube

Substance

Correction Factor

No. of pump strokes

Measuring Range

1,3-Dichloropropane	Factor: 0.5	2	0.5 to 10 ppm
p-Ethyl benzylchloride	Factor: 2.5	2	2.5 to 50 ppm
Ethyl chloroformate	Factor: 7	2	7 to 140 ppm
2-Methyl allyl chloride	Factor: 2.75	1	2.8 to 55 ppm
Methyl chloroformate	Factor: 58	5	58 to 1160 ppm
Propylene dichloride	Factor: 40	2	40 to 800 ppm
1,2,4-Trichlorobenzene	Factor: 0.65	4	0.65 to 13 ppm