Gastec 111L 甲醇检测管 CH3OH（20-1000ppm）

制造商: Gastec
Model: 111L
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技术规格
制造商消息

Indicator: 40 to 1000 ppm
Measuring Range:
+ 20 to 40 ppm, Number of Pump Strokes 2
+ 40 to 1000 ppm, Number of Pump Strokes 1
Sampling Time: 2 minute per pump stroke
Colour Change: Pink → Pale blue
Reaction Principle: CH3OH + Cr6+ + H2SO4 → Cr3+
Coefficient of Variation: 10% (for 40 to 200 ppm), 5% (for 200 to 1000 ppm)
Nr. of tests: 10
Pump: GV-100S/110S

Details

Performance

Measuring Range

20 to 40 ppm

40 to 1000 ppm

Number of Pump Strokes

Correction Factor

Sampling Time

2 minutes per pump stroke

Detecting Limit

15 ppm (n=2)

Colour Change

Pink → Pale blue

Reaction Principle

CH3OH + Cr⁶⁺ + H2SO4 → Cr³⁺

Coefficient of Variation

10% (for 40 to 200 ppm), 5% (for 200 to 1000 ppm)

Shelf Life

3 Years

Corrections for temperature & humidity

Temperature correction is necessary

Store the tubes at cool and dark place.

Possible coexisting substances and their interferences (NOTE)

Substance

Concentration

Interference

Change colour by itself to

Alcohols		+	Pale blue
Acetone	1000 ppm	+	No discolouration up to 1000 ppm
Ethyl Acetate	500ppm	No	No discolouration up to 500 ppm
Toluene	300ppm	No	No discolouration up to 300 ppm
Benzene	70ppm	No	No discolouration