Gas detection tube industry standard
The Japanese GASTEC gas detection tube is a slender glass tube with a scale printed on its outer surface, which makes it easy to directly read the concentration of the gas (steam) to be measured. A filler such as silica gel or alumina is contained in the detection tube, and a highly selective and highly stable detection reagent is attached thereto. When the target gas is in contact with the detector, a chemical change occurs, resulting in a distinct color change. Both ends of the detection tube are sealed. To date, more than 600 gases have been detected in this way.
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Features:
- Simple operation: whenever and wherever, you can quickly complete the test where you need it
- Intuitive judgment: After the pumping is completed, the concentration value can be read directly from the scale corresponding to the color changing layer, which is simple and clear.
- Wide detection range: by adjusting the pumping volume. Can expand the detection range
- Accurate test results: Each batch of test tubes must be calibrated by multiple tests to ensure the accuracy of the test. Each test tube is marked with a batch number for quality inspection
- Long service life: good product stability and longevity
- The manual gas collector used with it has a volume of 50 ml and 100 ml and weighs only 240 g. This device is only suitable for GASTEC fast gas detection tubes
Initially there was no specified standard for the test tube in the Japanese Industrial Standards, except that there is a standard for the carbon monoxide detector in the JISM7605/JISM7650 (originally set for coal mine safety), and several are attached to specific gases. Standards for analysis (eg, detection of exhaust gases, detection of impurities in compressed air, or detection of gases in compressed gas cylinders). These rules also apply to specific gas detection tubes. It was not until 1985 that there was a comprehensive regulation on test tubes: JIS K 0804. This standard specifies the standards for equipment that test the quality of workplace gases (not just test tubes), which is currently the most complete. .
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Other standards
Of course, there are some other standards for gas detection tubes. For example, the British standard BS5343, the German standard DIN33882 and the international standard IUPAC (International Union of Pure and Applied Chemistry). However, these relevant standards only specify the gas standards in the workplace, rather than specifying the actual testing process as in the Japanese JIS standard. The table below lists the similarities and differences between the relevant standards.
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Execution requirements | standard name | |||||
JIS K O804 | BS5343 | lUPAC | ANSl/ISEA102-1990 | |||
gas body Pick set Device | Volume (capacity) | ±5% | ±5% | ±5% | ±5% | |
Air tightness | 3% or max. 3%/min. | - | Max.3%/min | Max. 3%/min. | ||
Intake rate | Should not be greater than ±10% of the volume of the pump | - | - | - | ||
Durability | Requires continuous extraction 100 times, still meets safety requirements | Should ensure that the volume error is within +/-5% after 10 consecutive extractions | - | - | ||
Check Measurement tube | Detecting agent vertical deviation | 2mm or less | 1mm or less | 2mm or less | 2mm or less | |
Discoloration layer deviation error | 20% or less | 20% or less | 20% or less | 20% or less | ||
Means Show fine degree | 1 | More than 1/3 of the scale is reached: indication value ± 25% mean ± 15% | Allowable concentration of +30 -20% | Allowable concentration of 1, 2, 5 times ± 25% | Allowable concentration of 1, 2, 5 times ± 25% | |
2 | Achieved below 1/3 of the scale: indication value ± 25% mean ± 15% | Allowable concentration 1/2, 2 times +50 ~ -20% | 1/2 times ±35% of the allowable concentration | 1/2 times ±35% of the allowable concentration | ||
Discoloration length | - | 15mm or more | 15mm or more | 15mm or more | ||
Note:
BSI: British Standards Institution British Standard Institution
BS5343: 1976 gas detection tube
lUPAC: International Union of Pure and Applied Chemistry, International Union of Pure and Applied Chemistry test tubes, implements gas (steam) automatic alarm standards for applicable workplaces
ANSl/ISEA: American National Standards
Industrial Safety Equipment Association Association
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SEI certification
SEI certification / SEI certification requirements / NOISH certification procedures
GASTEC test tubes meet worldwide quality standards and standards. SEI certification is one of the most rigorous certifications in the world, and we are honored to receive world-class certification from this organization.
SEI: Safety Equipment Institute (USA)
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SEI American Safety Equipment Association is a private, non-profit organization established in the United States in 1981 to conduct non-government extensive third-party certification of occupational safety and protection. In 1986, it completed the national certification system for test tubes, which greatly improved the existing NIOSH (National Institute for Occupational Safety and Health) certification system. The SEI certification process is accredited by the American National Standards Institute [ANSI] and applies to the ANSI/ISEA l02 American National Standard (Gas Detection Tube) - rapid detection of toxic gases in the working environment. The certification process is rigorous and objective, and the experts in the field in the third-party position conduct inspection and audit of products and production equipment and management. Currently, SEI has certified 21 types of detection tubes for detecting 21 gases/vapors.
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SEI certification requirements
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1. Gas concentration indication accuracy four points: +/- 35% (half of the test standard concentration), +/- 25% (1, 2, and 5 times the standard concentration respectively. US Industrial Hygiene Committee regulations The American Conference of Governmental Industrial Hygienists (ACGIH) is the specified test standard concentration.
2. The length of the color-changing layer is at least 15 mm at the specified concentration, and the maximum standard error of the three readings is 10%. 3. The sloped tip of any color-changing layer does not exceed 20% of the entire color-changing layer.
4. The filling gap of any detector and filler should not exceed 2 mm.
5. The standard error of the gas extracted by the gas collector should be within +/- 5%. Any leak should not exceed 3% / minute. 6. In addition, the explanatory form and logo should comply with the regulations.
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Gas sampling method
Vacuum suction/injection/exhaust pump/compressed air/diffusion method/vapor-liquid equilibrium method/reagent reaction method/capillary method/liquid inhalation method
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GASTEC Quality Assurance / Prerequisites
Test tube standard gas method
Standard gas
Permeation tube method / diffusion tube method / compressed gas method / static diffusion / dynamic diffusion
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Other Information
Standard suction volume
Extended detection range
Accuracy and error
Arbitrary error/systematic error
Reaction principle
Direct reaction / complex reaction / two-step reaction
Temperature effect
Temperature correction / temperature change effect
Humidity effect
Pressure effect
Influencing factors of pressure / correction of atmospheric pressure
Coexistence of gas
Safe storage and storage of GASTEC test tubes
Detection tube disposal
Unit of gas concentration
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