KIN-TEK Trace Source™ Disposable Permeation Tubes [brochure] are:
- Polymer membranes about the size of a pencil containing the liquid phase of the component compound
- Popular because they are small and convenient to use.
SRT Standard Rate Disposable Permeation Tubes
- SRT Standard Rate Disposable Permeation Tubes generate moderate concentrations of high vapor pressure compounds. These compounds include SO2, H2S, NH3, Cl2, etc. Additionally, SRT permeation tubes can generate very low concentrations of low vapor pressure compounds such as Carbon disulfide, Methylene chloride and Nitric acid. Typical emission rates yield concentrations of 1 to 10 ppm depending on the compound, operating temperature and dilution flow rate.
SRT-2 Standard Rate Disposable Permeation Tubes
- SRT-2 Disposable Permeation Tubes can generate moderate concentrations of high vapor pressure compounds such as Cl2, NO2 and NH3. These tubes can be used at temperatures up to 50°C. Typical emission rates yield concentrations of sub-ppm to 5 ppm depending on the compound, operating temperature and dilution flow rate.
HRT High Rate Disposable Permeation Tubes
- HRT Permeation Tubes can generate moderate concentrations of low vapor pressure compounds. These compounds include C2H5SH, CCl4, Acrylonitrile, Benzene, Styrene and Water. HRT tubes are also used for generating high concentrations of SO2, CH3SH and other moderate vapor pressure compounds. Typical emission rates yield concentrations of 1 to 20 ppm, depending on the compound, operating temperature and dilution flow rate.
Extra life (EL) Permeation Tubes are designed to have a longer operating life than other disposable tubes and are recommended for special compounds.
ELHRT Extra Life High Rate Disposable Permeation Tubes
- EL-HRT Permeation Tubes are used for generating moderate concentrations of low vapor pressure compounds such as C2H5SH, Benzene, and Water, and for generating high concentration mixtures of SO2, CH3SH and other moderate vapor pressure compounds. Typical emission rates yield concentrations of 1 to 10 ppm, depending on the compound, operating temperature and dilution flow rate.
ELSRT Extra Life Standard Rate Disposable Permeation Tubes
- EL-SRT Permeation Tubes are used for generating moderate concentrations of high vapor pressure compounds such as SO2, H2, NH3, and Cl2, and for generating very low concentrations of low vapor pressure compounds such as Benzene, Acrolein, and Water. Typical emission rates yield concentrations of 1 to 5 ppm, depending on the compound, operating temperature and dilution flow rate.
ELSRT-2 Extra Life Standard Rate Disposable Permeation Tubes
- ELSRT-2 Permeation Tubes are used for generating low to moderate concentrations of high vapor pressure compounds such as Cl2, NO2, and NH3. Typical emission rates yield concentrations of sub-ppm to 2.5 ppm, depending on the compound, operating temperature and dilution flow rate. This type of tube is also used for field service where higher operating temperatures may be required.
The purpose of a gas standard is to establish accurate reference points for the verification of an analysis.
Static mixtures in gas cylinders are often unreliable and inaccurate at the levels (ppm to ppb) that analytical technology now demands.
In gas cylinders containing low level mixtures, the trace components often adsorb on to, or react with, the cylinder walls causing the standard to be inaccurate and unreliable.
Also, it may be impossible to get a matrix gas that is completely free of the trace component, thus making it impossible to get a true reference point with a cylinder mixture.
These problems are solved by using permeation tubes in lieu of gas cylinders.
Types of KIN-TEK Trace Source™ Permeation Tubes
KIN-TEK manufacturers permeation tubes in two basic types – disposable and refillable – for over 500 chemicals.
Disposable Tubes
Disposable Permeation Tubes are tubular devices about the size of a pencil with liquid component compound sealed inside. The component compound slowly permeates through the tubing wall creating a very small flow of component vapor. Disposable tubes have a finite operating life and are discarded at the end of that life. They are primarily used to make lower and medium concentration mixtures.
Refillable Tubes
Refillable Permeation Tubes generally offer a broader range of concentration than disposable tubes. They are often recommended for long-term service and for applications requiring a broad range of calibration points.
Refillable tubes are used for higher concentration mixtures. They are also used for high pressure gas components (CH4, C2H4, O2, H2, etc.) where the gas must be frequently replenished. KIN-TEK offers factory refill and recertification services; however, some tubes may be refilled by the customer (with appropriate safety measures in place).
High emission tubes in gas service are refilled in-situ, using controls in various models of KIN-TEK Gas Standards Generators.
To learn more, read the following PDF document titled “Permeation Tubes: A simple Path to Very Complex Gas Mixtures.
Accuracy
KIN-TEK Trace Source™ Permeation Tubes are reliable and accurate. Because the calibration standard delivered by the permeation tube method is used fresh (i.e., dynamically), adsorption and reaction problems are minimized.
Compliance
Our customers are increasingly concerned about compliance issues, OSHA, ISO 9000, GMP, and other industry requirements. Addressing these concerns, KIN-TEK supplies a certificate documenting traceability to NIST with every certified Trace Source™ permeation tube. Each tube is numbered and its emission rate is kept on file at KIN-TEK for up to 5 years
KIN-TEK also provides Technical Services for permeation tube recertification, annual instrument recertification, and periodic on-site calibration to help you maintain compliance with your internal standards.
Safety
Trace Source™ Permeation Tubes are very small compared to high pressure gas cylinders (disposable tubes are about the size of a pencil). Permeation tubes contain only a small amount of chemical thus limiting the possibility of acute exposure.
Eliminate The Danger of High Pressure Cylinders
Trace Source™ Permeation Tubes eliminate the hazards of handling high pressure cylinders. They contain analyte only under its own vapor pressure and have no valves to break off. Permeation tubes do not require special equipment to handle or transport them. Most permeation tubes can be shipped worldwide as non-hazardous goods.
Savings
One Trace Source™ Permeation Tube can often replace 10 or more gas cylinders. When used in a KIN-TEK Gas Standards Generator, one Trace Source™ Permeation Tube can typically deliver concentrations over a range of 20:1 with primary dilution and 10000:1 (or more) with secondary dilution.
