GAS76 Tetrahydrothiophene Gastec Detector Tubes 1 - 10ppm

SKU: GAS76

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GAS76


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Excl. VAT: £28.50 Incl. VAT: £34.20
Excl. VAT: £28.50 Incl. VAT: £34.20

Product Description

Details

GAS76 Tetrachloroethylene Standard Gastec Detector Tubes

Gas detector tubes are glass tubes that are filled with chemical reagent that absorbs and reacts with the target gas or vapour being measured.

A colorimetric stain (a colour change) is created. For most tubes, the concentration is read directly from the pinpoint accurate measurement scale on each tube.

This makes this form of monitoring ideal for spot sampling as it can be more accurate then electronic gas detectors.

The Gastec detector tube system is comprised of a handheld Gastec air sampling pump and Gastec detector tubes.

Performance

Measuring Range

1 to 10 ppm

Number of Pump Stroke

4

Correction Factor

1

Sampling Time

1.5 minutes per pump stroke

Detecting Limit

0.25 ppm (n=4)

Colour Change

Pink        Pale Yellow

Reaction Formula

Tetrahydrothiophene reduces permanganate
to form pale yellowish reaction product.
C4H8S + MnO4 (Pink)        Yellow Reaction Product

Coefficient of Variation

10% (for 1 to 3 ppm), 5% (for 3 to 10 ppm)

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

Ethyl Mercaptan

1ppm

No

Discolour whole layer to pale pink

Ethylene

1000 ppm

No

Discolour whole layer to pale pink

Propylene

500 ppm

No

Discolour whole layer to pale pink

Methanol

300 ppm

No

Discolour whole layer to pale pink

Hydrogen Sulphide

30 ppm

No

Discolour whole layer to pale pink 

Calibration gas generation

Diffusion tube method

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