Gastec 70 Quick-measuring Detector tubes Mercaptans R-SH (0.5-120ppm)

Manufacturer: Gastec
Model: 70
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Specifications
Manufacturer Info

Indicator: 5 to 120 ppm
Measuring Range:
+ 0.5 to 5 ppm, Number of Pump Strokes 2 to 10
+ 5 to 120 ppm, Number of Pump Strokes 1
Sampling Time: 1.5 minute per pump stroke
Colour Change: White → Yellow
Reaction Principle: 2RSH+ PdSO4 → (RS)2Pd+ H2SO4
Coefficient of Variation: 10% (for 5 to 40 ppm), 5% (for 40 to 120 ppm)
Nr. of tests: 10
Pump: GV-100S/110S

Details

Performance

Measuring Range

0.5 to 5 ppm

5 to 120 ppm

Number of Pump Strokes

2 to 10

Correction Factor

1/2 to 1/10

Sampling Time

1.5 minutes per pump stroke

Detecting Limit

0.2 ppm (n=10)

Colour Change

White → Yellow

Reaction Principle

SH+ PdSO4 → (RS)2Pd+ H2SO4

Coefficient of Variation

10% (for 5 to 40 ppm), 5% (for 40 to 120 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

Carbon monoxide	2000 ppm	+	Pale brown (whole layer)
Hydrogen sulphide	500 ppm	+	No
Acetylene, Ethylene	2000 ppm	+	Pale brown (whole layer)

Other substance measurable with this detector tube

Substance

Correction Factor

No. of pump strokes

Measuring Range

Ethyl mercaptan	1.0	1 to 10	0.5 to 120 ppm
Isopropyl mercaptan	2.0	1	10 to 240 ppm
Methyl mercaptan	0.7	1 to 10	0.35 to 84 ppm
Propyl mercaptan	4.5	1	22.5 to 540 ppm