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Products Category
- Gas Detection Tubes
Gastec Colour Gas Detector Tubes
The Gastec detector tube system comprises a handheld Gastec Gas sampling pump and Gastec detector tubes.
- Ideal for short term measurement and low level detection
- Uses simple colour change technology
- Determining and measuring concentration peaks
- Detecting leaks in pipelines gas installations, etc
- Air analysis in sewers, shafts and confined spaces
Gastec Detector Tubes are used in environments where sampling, screening and TWA measurement is required. They are of the highest quality for accurately analysing a wide variety of gases, vapours and ground substances. The glass tubes 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 form of monitoring is ideal for spot sampling as it can be more accurate then electronic gas detectors.
Gastec Injection Type Tubes
Uses an injector tube to sample gas samples, which is inserted into a detector tube to perform measurements. Detector tubes used for high concentration carbon dioxide and propane gases apply this feed-in method.
Tubes are supplied in packs for 10 tests.
Click on the symbol to view the specific datasheet.
Gastec Compressed Breathing Air Measurement System
The Gastec 810-CG-1 system can simply, quickly, and simultaneously measure four kinds of harmful contaminants (CO, CO2, Water vapour, and Oil mist) contained in compressed breathing air (cylinder or compressor).
- Fast and easy determination of breathing air quality - simply connect the measuring device to a cylinder or compressor
- Portable - no power supply required
Airtec Tube Specifications when used with the Compressed Breathing Air Measurement Kit
| Airtec Tube | Measuring Range (ppm) | Flow Rate (ml/min) | Sampling Time (mins) | Part Number |
| Carbon monoxide CO | 5-50 | 100 | 5 | 810-1A |
| Carbon dioxide CO2 | 250-3000 | 190 | 5 | 810-2A |
| Water vapour | 10-80 mg/m3 | 100 | 5 | 810-6A |
| Oil mist | 0.2-5.0 mg/m3 | 3000 | 10 | 810-109AD |
| Compressed Breathing Air Measurement Kit | Part Number |
| Gastec Compressed Breathing Air Measurement System includes:
Measuring device, 4 x rubber shrouds, 4 Gastec Airtec Tubes (810-1A, 810-2A, 810-6A, 810-109AD), stopwatch, tube tip breaker/holder, plastic carrying case, instruction manual and deep socket. |
810-CG-1 |
| Accessory | Part Number | |
| Replacement rubber shroud/tube holder | 810-357 |  |
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Instructions |
Gastec Toxic Gas Detection System
The prime importance in the case of emergency response to chemical spills, or investigation after a fire, is to quickly determine any gases present and their concentrations. With the Gastec Toxic Gas Detection System this can be accomplished quickly, easily and accurately on the site, using 12 types of Gastec Detector Tubes and the Gas Sampling Pump. As the substances to be measured could be hazardous, adequate precautions should be taken to ensure safety.
- Fast and easy determination of pollutants
- Portable - no power supply required
- Minimal training required - follow the simple flowchart
- Cost effective
- Minimal maintenance compared to electronic detection systems
Measurement Procedure
1. Confirm the air current direction using the Smoke Tester Kit
2. Connect the Extension Hose if necessary, to take a sample from a hard-to-reach area or from a manhole
3. Break off both ends of a Polytec I (Part Number 810-107) tube and connect it to the pump (or to the end of the extension hose if used)
4. Pull out the handle of the pump, wait for the predetermined sampling time, and examine the tube for colour changes
5. Proceed with the measurements by using the 12 types of detector tubes, as directed by the Toxic Gas Determination Flowchart
6. Finally, determine the pollutants from the measurement results
| Description | Part Number |
| Gastec Toxic Gas Detection System, includes
Smoke Test Kit (810-500), 12 boxes of Gastec Tubes (810-107, 810-141, 810-128, 810-151, 810-135, 810-111L, 810-4LL, 810-1L, 810-14L, 810-3LA, 810-12L, 810-8LA), Gas Sampling Pump (810-110), 5 m Extension Hose (810-350A), 2 x rubber connectors, handbook and lockable aluminium carry case. Dimensions: 46.5 x 13.8 x 37.3 cm (18.3 x 5.4 x 14.6 inches), Weight: 5 kg (11 lb) |
810-TG1 |
Gastec Passive Dosi-Tubes
Gastec Colour Dosimeter Tubes (Dosi-tubes) provide reliable, on-the-spot Time-Weighted Average (TWA) monitoring of worker exposure to gases and vapours. The system is simple-to-use and easy-to-read, with no need for a pump, chart, or laboratory analysis. The Dosi-tube system allows an operator to evaluate the level of exposure over a long time period such as a working shift.
The system consists of Gastec Dosi-tubes and a tube holder (part number 810-710). The pre-scored ends of the tube are simply snapped off and the tube inserted into a tube holder. Air diffuses passively through the tube and reacts with the detecting reagent within, giving a colour change result that is indicated on the printed scale. The tube holder can either be attached in a worker’s breathing zone or installed in work areas to act as an area monitor.
Using a simple equation, the Dosi-tube system produces an average concentration of exposure over a set period of time – commonly known as a Time Weighted Average (TWA). To calculate the ppm level simply read the printed calibrated scale on the tube for exposure measurement in parts-per-million-hours (ppm-hours), and divide the reading by the number of hours sampled.
Note: When measuring carbon dioxide, mount the tube holder on the worker’s waist rather than in their breathing zone. This will avoid overstating CO2 levels due to exhalation.
