Heat treatment at low pressures
High temperature vacuum furnaces are used for heat treatment of samples at low pressure (down to 10-6 mbar) and under partial gas atmospheres. In the bottom loader version the bottom is lowered and driven out of the furnace. It then pivots forward to permit easy loading. This design makes the useable volume accessible from all sides and allows for exact placement of the sample thermocouples which measure the temperature of the sample.
CARBOLITE GERO's HTBL series is available for working spaces with volumes from 50 l to 200 l and for temperatures up to 2200°C. The furnaces are designed for operation under vacuum. Any pressure between 10 and 1000 mbar can be controlled via an integrated pressure control with a precision of approximately ± 2 mbar. The pressure control works independently of the supplied gas volume which can be defined for every step of the process. At low pressure, for example, high as well as low gas volumes can be supplied. The pressure control compensates the resulting vacillations.
The furnaces are additionally equipped with redundant thermocouples and optical pyrometers to ensure high process stability. The controller carries out plausibility checks independently and, if the thermocouples and optical pyrometers deliver improbable measurement results, switches to the redundant measuring unit. The thermocouples are used from room temperature up to 1200°C. Above that temperature all thermocouples are automatically removed from the furnace for protection, and the system automatically switches to operation with optical pyrometers. These have a measuring range from 350°C to 2200°C. By using 4 independent optical pyrometers per furnace, the sample batch can be closely monitored and the temperature profile can be recorded. In combination with a Siemens controller S7-300 (SPS) it is possible to reliably program, monitor and control exacting thermal processes. The process data are visualized on the integrated PC monitor (WIN CC).
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