Electric chamber muffle furnaces, type PKM

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Electric chamber muffle furnaces for laboratories are a type of chamber electric furnaces in which ceramic flakes as a muffle. A ceramic muffle assembled from tiles protects the working space of the furnace from electric heaters.

The heat treatment temperature in muffle furnaces is slightly lower than in PKL furnaces, because the electric heaters are closed in the space between thermal insulation and muffle elements. Electric furnaces with a ceramic muffle, PCM type, as more versatile, are suitable for most laboratory tasks associated with heat, they are also safer. It is especially effective to use muffle furnaces when direct heating of workpieces or materials is undesirable. When heating can form aggressive effluents or fumes, no contact between the workpiece and the heater is allowed. For example, during heating, the workpiece may deform and hit the heater, or heat build-up degrades the performance of the heater. Also, for ceramic muffle, sharp temperature changes are undesirable, therefore, electric muffle furnaces are recommended to be used for annealing, calcination of small metal workpieces or materials.

To reduce the effect of the furnace atmosphere on the heater, all muffle furnaces can be supplied with a forced blowdown option. (option)

Heat insulation of the furnace made of modern, high-performance thermal insulation materials. Chamotte-fibrous materials are used as thermal insulation. slabs and flexible fiber-ceramic mats. Thermal insulation has a relatively low thermal capacity and heat accumulation. Heating up to the maximum temperature will not exceed 80 minutes. Heating of blanks or samples is provided by spiral electric heaters placed on the sides of the working chamber in the space between the lining and the muffle. Hearth spirals laid in special channels of the bottom lining and covered with a muffle. The spiral heaters are fastened without touching the lining heater and the muffle.

The heating zone of the electric furnace is covered by a lined door with a twin mechanism. When opening the oven, the door moves horizontally to the side, so that the internal heated thermal insulation of the door, when opening it was always turned in the direction of the oven, which minimizes the possibility of scalding during loading and unloading.

For most applications, an electric oven with a single-stage thermostat is usually sufficient. Such a thermostat to heat the workpieces at a given temperature and maintains it until the heating is turned off. For more complex research, it is possible to complete the furnace with multistage thermostats. Such a thermostat allows you to set a heating program that takes into account up to 10 stages of heat treatment, with the ability to keep the holding time of each stage.

Power and control units are mounted in a special compartment of the furnace, on the right side of the furnace or below. The supply voltage for laboratory equipment is 220 volts. Purge chamber, oven stands, exhaust probes, etc. are available as options.