The observation window in the middle of the muffle furnace door is designed with a double-layered glass high-temperature observation window. This window allows for observation of the working chamber conditions. During the process, there is no need to open the furnace door to monitor the sintering status of the objects inside. The observation window is made of high-temperature-resistant glass, which boasts a long service life and is less prone to cracking due to high temperatures.

The SGM 1200°C muffle furnace with observation window utilizes Swedish Contour or steel resistance wire as its heating element. The rated temperature can reach 1200°C, with a continuous operating temperature of 1100°C. It features low surface temperature, rapid temperature rise and fall rates, uniform temperature field, and energy-saving, making it ideal for high schools, research institutions, and industrial and mining enterprises for high-temperature sintering, metal annealing, and quality testing.

Key Features of Sigma High-Temperature Muffle Furnace

1. The Sigma SGM 1200℃ box-type resistance furnace features a double-shell structure. The outer shell is made of thick carbon steel and cold-rolled steel plates, precision cut, bent, and welded into shape on CNC machine tools, ensuring durability and strength.

2. The double-layer furnace shell is equipped with an air-cooling system, allowing for rapid heating and cooling. It can reach 1000 degrees Celsius within 30 minutes. At high temperatures, the external temperature of the furnace shell is close to room temperature, making the shell not hot to the touch.

3. Double-color epoxy powder electrostatic spraying on the surface, processed by high-temperature paint baking, corrosion-resistant to acid and alkali; with a dual-color design, the SGM 1200℃ box resistance furnace features a novel and attractive appearance, as well as durability!

4. The SGM 1200℃ box type resistance furnace features a side door or top opening design for the furnace door, which is reinforced and thickened to prevent deformation. It includes a locking function and is equipped with an electric cutoff system when the door is opened. The operation is smooth, convenient, and labor-saving.

(Hinged doors: side opening, sliding, up/down lifting, pull-down, canopy-style, swing, etc. with lock)

5. Furnace Door Sealing: The furnace door is automatically sealed to the furnace body, eliminating the need for manual sealing. The furnace door features a special sealing structure to maintain a sealed state throughout the production process, preventing the escape of high-temperature furnace gases and ensuring a stable working environment within the furnace chamber.

6. The furnace chamber is made of ceramic fiber, with a high-temperature alumina coating on its surface to maintain cleanliness, extend the instrument's service life, and improve heating efficiency.

6. The electrical components are integrated into a monolithic structure with the furnace body, mounted on one side of the furnace, offering a compact design and minimal space usage. The control circuit is cooled by a cooling fan.

7. The SGM 1200℃ box-type resistance furnace temperature control is installed on the furnace panel, offering intuitive observation and easy adjustment; the temperature control system utilizes a Japanese Sanyo Denki or Xiamen Yudian 30-stage programmable temperature control system, adjusting temperature in PID mode. It allows for setting up to 30 stages of heating and cooling programs, featuring soft start, soft shutdown, and silicon-controlled rectifier phase-shifting voltage control. The output is adjustable from 0~98%. The panel is equipped with various instruments and switches, all labeled in Chinese. Operation is safe, convenient, and quick.

8. The SGM 1200℃ Box Type Resistance Furnace features high temperature control accuracy, balanced temperature field, fast heating and cooling rate, low surface temperature, low energy consumption, over-temperature alarm with power cutoff protection, and safe and reliable operation.

9. High-power electric furnaces are equipped with fully isolated silent copper wire transformers, featuring low noise. They have less heat output and a high safety factor.

10. The button switches are of high-quality, featuring indicator lights for stable performance and long service life.

11. The 1200℃ box-type resistance furnace uses high-quality electric resistance wire for heating. The heating elements are installed on the left and right sides of the inner furnace chamber. Its structural design is easy to install, quick to maintain and replace, and will never form a thermal short circuit with the furnace shell, thus preventing localized overheating of the furnace shell.

12. Features include Li's over-temperature protection, over-pressure, over-flow, leakage protection, short-circuit, etc., with a high level of automation and all indicators reaching advanced levels.

Main technical parameters of a 1200°C muffle furnace with observation window: