Blow-off evaporator
Blow-off evaporators remove solvents from samples using inert gas jets, typically at temperatures above 60 °C. They are suitable for small to medium sample volumes in various vessels such as tubes or microtiter plates.
Blow-off evaporator
Blow-off evaporators remove solvents from samples using inert gas jets, typically at temperatures above 60 °C. They are suitable for small to medium sample volumes in various vessels such as tubes or microtiter plates.
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Guide and selection support
Blow-off evaporators are used in laboratories to selectively remove solvents from samples by directing a stream of inert gas, thereby concentrating the samples. This is achieved by immersing gas needles into the sample containers, often combined with heating to accelerate the evaporation process.
When selecting blow-off evaporators, factors such as the type and size of sample vessels, the inert gas used (e.g., nitrogen), and the achievable temperature ranges are important. Users should also consider the device's flexibility regarding sample throughput and ease of use.
LabFinder supports targeted searches for blow-off evaporators with clear product and supplier selections, guidance on technical features, and notes on typical applications and device variants.
Application and Benefits
Blow-off evaporators are used for targeted removal of solvents from samples using a stream of inert gas, which is injected or blown into the sample through needles. This leads to effective sample concentration with relatively gentle treatment. Typical fields of application are analytical laboratories where small volumes in tubes, vials, or microtiter plates are processed and further analyzed. The devices are often operated at temperatures above 60 °C to accelerate evaporation.
Selection Criteria
Essential criteria for choosing a blow-off evaporator include compatibility with the intended sample vessels and precise temperature control. Inert gases, especially nitrogen, are most commonly used. The number and arrangement of needles should match the sample format, and ease of handling and cleaning are important. The technology and performance should reflect the intended application, such as frequent use or batch size.
Variants and Measurement Principles
Blow-off evaporators mainly differ in the type of gas delivery, the number of needles, as well as temperature control and range. The basic principle is the simultaneous flushing of the sample with a gas flow and thermal support to evaporate the solvent. Devices with automated temperature and time control are often preferred, as they enable reproducible results.
Calibration and Maintenance
Regular cleaning of needle parts and checking the gas supply are essential maintenance steps. Classical calibration is seldom required, but temperature sensors and gas delivery should be checked and adjusted as needed to ensure consistent evaporation conditions.
Limitations of Application
Blow-off evaporators are especially suitable for removing volatile solvents with low boiling points. For samples with high boiling points or very high throughput, efficiency may be limited. In these cases, alternative evaporation methods such as vacuum concentrators are preferred, as they offer better concentration and gentler treatment.
Search Terms and Related Concepts
Synonyms and related terms include: blow-off evaporator, inert gas evaporator, nitrogen evaporator, gas-blowing evaporator, needle evaporator, gas-blast evaporator, sample evaporator, and evaporator with protective gas. Important keywords in research include sample concentration, solvent evaporation, inert gas, nitrogen, needles, microtiter plates, laboratory evaporator, and sample preparation.
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Frequently asked questions
How does a blow-off evaporator work?
A blow-off evaporator directs an inert gas, usually nitrogen, through fine needles directly into the sample to actively displace the solvent and, with simultaneous heating, accelerates the evaporation.
What sample vessels are blow-off evaporators suitable for?
Blow-off evaporators are designed for small to medium sample volumes and are suitable for use with tubes, vials, and microtiter plates.
What are important criteria when selecting a blow-off evaporator?
Important factors include compatibility with sample vessel size and type, temperature control to at least 60 °C, the number of gas needles, and safe, easy handling.
Which solvents can be removed with blow-off evaporators?
Blow-off evaporators are particularly suitable for volatile solvents with low to medium boiling points. For high-boiling solvents, other methods such as vacuum concentration are used.
How is a blow-off evaporator maintained?
The needles and gas supply lines should be cleaned regularly. In addition, temperature sensors and gas flow should be checked to ensure consistent evaporation conditions.
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