To maintain the pressure in the gas bottle and to empty it entirely, ...
... a gas bottle heater from eltherm is used.
Gas is one of the three aggregate states in which substances can exist. Gas is characterised by freely moving molecules that evenly fill the space available. To store as much gas as possible in a container, the gas is highly compressed. Cylindrical or spherical containers are usually used for this, as they are particularly robust.
Gas bottle heaters ensure a reliable gas supply by providing increased extraction capacity and pressure stabilisation.
Gas bottle heaters keep the pressure stable when the filling level decreases, or high withdrawal quantities are used and prevent gas bottles and fittings from freezing up. They also allow the cylinder to be emptied almost completely, which is particularly important when using noble gases.
With the help of a gas bottle heater, it is possible to ensure ...
... that the cylinder does not freeze and the gas extraction stops.
To remove the gas while it is still liquid, it must vaporise and reach a gaseous state, a process that requires heat. This heat is absorbed by the gas from the immediate surroundings, i.e. via the surface of the gas cylinder. As a result, the cylinder cools down, the moisture in the immediate vicinity of the cylinder condenses and settles on the outer wall of the container. If the cylinder then continues to release gas at the same rate, the condensation will freeze on the cooled cylinder wall.
Noble gases are mainly used in the semiconductor industry. They are very expensive, so it must be ensured that the gas cylinders used are emptied as efficiently as possible. These gas cylinders are usually placed on separate scales. With the help of these scales, the filling level of the gas cylinder can be determined. As gas will become lighter when it gets cold, the scales may not provide a reliable result - i.e. the weight displayed will show "empty" even though the gas cylinder has not yet been completely emptied. To guarantee that the gas cylinder is completely empty, heating by means of a thin eltherm heating mat ensures that the inert gas does not get cold and loses weight. This allows the scales to determine the correct weight and the gas cylinder will only be replaced when it is really empty.
Therefore, a gas bottle heater is used to both heat the media contained and keep them at a certain temperature. eltherm gas bottle heaters are available in standard sizes and are suitable for temperature ranges of up to 300 °C. For quick and easy use, the appliances are hinged, and fitted with a quick-release fastener and handles. In non-Ex areas, silicone heating mats are often preferred due to their straightforward application. The temperature is regulated by means of a controller and limiter.
- quick and easy to use
- high-quality insulation ensures energy-efficient use
- can also be used in hazardous areas
FAQ
To determine the filling condition of a gas cylinder, the cylinder is weighed and replaced if necessary. Since gas loses volume and becomes lighter when it is cold, the result on the scale can be falsified as a result of cold outside temperatures. This means that the scale measures a weight that is too low, and the user is then inclined to replace the gas cylinder even though it is not completely empty. To avoid this, the gas cylinder can be heated with a very thin heating mat so that the gas inside is kept at a constant temperature, to prevent it from losing volume and to ensure that the scale determines the correct fill level.
As the gas only changes from a liquid to a gaseous state under pressure, the pressure in the gas cylinder must also be maintained when gas is removed. In this way it is ensured that additional gas will be supplied. To maintain the pressure in the gas cylinder, electrical heat tracing is used on the gas cylinder.
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E-mail: info@eltherm.com
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