A wide range of work tube accessories is available when ordering a Carbolite Gero tube furnace.
To ensure the right work tube accessories are supplied, please specify the tube furnace model (horizontal or vertical use), work tube dimensions (inner diameter, outer diameter and length) and operating temperature. If you are unsure which accessories are the most suitable for your application, please consult our application experts.
CERAMIC INSULATION PLUGS
Ceramic insulation plugs are designed to reduce heat loss from tube ends and improve temperature uniformity. They benefit vertical tubes and tubes with diameters greater than 25 mm. Different insulation plugs are supplied with standard-length work tubes (for use in air) and extended-length work tubes (for use with modified atmosphere and vacuum). Insulation plug supports are required in vertical work tubes unless used with work tube end seals.
Insulation plugs include metallic hangers which allow vertical use and a groove for thermocouple access.
The insulation plugs supplied will be appropriate for the furnace and application.
WORK TUBE RADIATION SHIELDS
In extended work tubes, radiation shields can be an alternative to insulation plugs. Specifically useful for dust-free applications and with vacuum levels lower than 10-3 mbar.
Up to a maximum operating temperature of 1200 °C, the shields are constructed from metal and, above this temperature, from ceramic. Radiation shield supports are required in vertical work tubes unless used with work tube end seals (see below).
Radiation shields include metallic hangers which allow vertical use and a groove for thermocouple access. The shields supplied will be appropriate for the furnace and application.
WORK TUBE END SEALS
Work tube end seals are required to contain a modified atmosphere, and for working with a vacuum, vacuum levels of 10-6 mbar are possible. These end seals are manufactured from stainless steel and used with extended work tubes only. They can fit work tubes with the following outside diameters: 32, 46, 60, 86, 100, 150 and 200 mm. Other sizes are available at additional cost.
The following fittings are available for use with the end seals: blank seal, gas nozzle (inlet/ outlet), vacuum flanges (NW16, NW25, NW40 or ISO-K 63) and thermocouple glands (ø1.5 mm, 3 mm and 10 mm). Where the end seal diameter is large enough, combinations of the above fittings are possible, e.g. gas inlet/out nozzle + thermocouple gland.
The end seals are designed for use with insulation plugs or radiation shields. Water-cooled end seals are available on request. Tube supports are recommended to accommodate the additional weight of end seals (see below).
NOTE: The acceptable tolerance of the work tube outside diameter is +1.5 mm to -1
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| Gas nozzle (inlet/outlet) | NW40 vacuum flange | Gas nozzle and Thermocouple gland (1.5 mm) |