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Gastec – Japanese manufacturer – is a world leader in monitoring and detecting gases and vapors using gas detector tubes (colorimetric and dosi-tubes). They provide more than 600 references available in 3 to 5 days thanks to their European stock based in the United Kingdmon.

Colorimetric gas detector tubes Gastec

gastec gas detection TUBES

A colorimetric gas detection tube is perfectly suitable for one-off measurements or when there is no available classic device to detect and measure particular substances. This easy-to-use, accurate and cost-effective device requires no particular technical skills. There are four tube categories.

Colorimetric gas detection tube

This one-off measurement equipment (instant measure) is composed by a tube specific to the targeted gas and a manual air sampling pump. This combination is inseparable. Only a few activations of the pump (from 1 to 3 pump strokes) are enough to get an accurate measure within seconds. This is by far the most popular gas detection tube solution!

Dosimeter tube

Dosimeter tubes– or dosi-tubes – are a bit different than colorimetric tubes. They are TWA measuring equipment (Time Weighted Average value). They provide an average measurement of determined hazardous substances on a specific duration – 8 hours usually.

Pyrotec tube (for freons/refrigerant gases and anaesthetic gases)

This one-off measurement device is composed of a specific gas detection tube added to a pyrolysis battery system and a manual air sampling pump – the same as the one used for classic colorimetric tubes. Only a few pump strokes (from 1 to 3) are enough to get accurate measurements of refrigerant or asphyxiating gases concentration levels.

Airtec tubes (compressed breathable air quality)

Airtec tubes are designed to get fast and easy measurements of compressed air cylinders air quality for self-contained breathing apparatus, PAPR airline systems and diving bottles. This monitoring and control unit for air contained in compressed air cylinders is dedicated to get better safety.

gas detector tubes STOrAGE and recycling

It is recommended to store Gastec tubes in a cool (from 0 to 10°C) and dark place to keep their quality. Any direct contact to sunlight could damage the reagent of the tubes. Never store Gastec tubes in places where the temperature is higher than the normal or their accuracy could be affected.

Used or expired tubes – break both ends of expired tubes – shall be plunged in water (no more than 20 tubes in 5 liters of water) during several hours (or all night long). The glass tubes can then be disposed with other glass garbage. The water can be poured into the sewers. As the quantity of reagents is minimal, there is no risk for people and  environment.

GASTEC / GAZDETECT partnership

Gastec is a key partner for GazDetect thanks to its very large range of colorimetric gas detection tubes and its technical expertise. With about 600 specific tube references like dosimeter tubes (TWA measurement), pyrotec tubes (specific to freons and anaesthetic gases) or Airtec tubes (to analyse breathable air quality), Gastec is a major player for one-off gas monitoring using gas detection tubes.

Learn more about our partner

The GSP-300 gas sampling pump is a very accurate aspirated pump designed for TWA and STEL measurements with colorimetric gas detection tubes

  • sampling pump GSP300
  • Large LCD screen for pump display and setup
  • Adjustable 50/520 mL/min flow according to inserted tube
  • Flow automatic correction
  • 10 hours runtime with two AA batteries
  • Dimensions: 80 x 40 x 10 – weight: 300 grams

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TWA measuring system (time-weighted average) – also known as dosimeter tube or passive tubes gas detection – measures the time-weighted average concentrations of a gas in ambient air.

  • Gas detector tubes Dosimetric tubes
  • The dosimeter tube is inserted in its holder and wore close to the breathing zone (e.g. a shirt collar) to get an accurate measure of inhaled concentrations. This allows the monitoring of hazardous exposure during a working day.
  • Thanks to this system, wokers can easily get daily exposure concentrations and evaluate working areas. These simple and direct measures require no specific analyzis instruments or complex operation procedures.

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The colorimetric gas detection tube system is a simple and accurate solution composed by a manual sampling pump and a specific gas detection tube. They are designed for use together.

  • Gas detector tubes Colorimetric tube
  • Accurate: the sampling pump features a mechanical accuracy piston which creates a vacuum then enables direct reading on the colored tube (colorimetric tube)
  • Swift: one or two pump strokes are enough to draw sample and the value can be directly read on the tube
  • User-friendly: no knowledge, no specific process and no technical competence are required

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Combined with the Gastec pump, the Pyrtec 840 pyrolyzer thermally converts freons (fluorochlorocarbons), halogenated hydrocarbons and some anaesthetic gases in order to accurately measure them.

List of freons: R11, R12, R22, R112, R113, R114, R123, R124, R141B, R22

  • Pyrolizer for colorimetric gas detection
  • In-situ user-friendly, cost-effective, quick and accurate measurement
  • 2 minutes warm-up time
  • Filament lifetime: around 1,000 measures at 20 ppm
  • Dimensions: 150 x 68 mm – weight: 245 grams
  • Relative runtime autonomy: 2 hours continuously

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Airtec tubes enable easy and fast quality monitoring of compressed air cylinders for self-contained breathing apparatus, airline systems and diving bottles to comply with the EN12021 standard

  • gas detector tubes for compressed air quality analysis
    • Monitored gases: CO, CO2, H2O, NO, NO2, oil vapors
    • User-friendly and accurate monitoring of breathable air quality
    • Convenient and lightweight carrying case for on-site monitoring
    • Pressure reducer connection to avoid loss
    • Two available kits: STD-300 standard kit and AIR-QUAL kit

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