Classification of muffle furnaces: Muffle furnaces are classified according to their heating elements, operating temperatures and controllers: 1) According to the heating element, there are: electric furnace muffle furnace, silicon carbon rod muffle furnace, silicon molybdenum rod muffle furnace; 2) According to the use temperature, it is generally divided into: box-type muffle furnace below 1000 degrees, muffle furnace (silicon carbon rod muffle furnace) of 1100 degrees to 1300 degrees, and silicon molybdenum rod muffle furnace used above 1600. 3) According to the controller, there are the following types: PID adjustment control muffle furnace (SCR digital temperature controller), program control muffle furnace (computer time temperature controller); 4) According to the insulation materials, there are two types: ordinary refractory brick muffle furnace and ceramic fiber muffle furnace. Muffle furnace installation precautions After unpacking, check that the muffle is intact and that the accessories are complete. 1. The general muffle furnace does not need special installation. It only needs to be placed on the concrete countertop or shelf on the solid floor. There should be no flammable or explosive materials around. The controller should avoid vibration, and the position should not be too close to the electric furnace to prevent the internal components from working properly due to overheating. 2. Insert the thermocouple into the furnace 20-50mm, and fill the gap between the hole and the thermocouple with asbestos rope. Connect the thermocouple to the controller zui to use the compensation wire (or use insulated steel core wire), pay attention to the positive and negative poles, do not reverse. 3. An additional power switch is required at the power line lead to control the main power supply. In order to ensure safe operation, the electric furnace and the controller must be reliably grounded. 4. Before use, adjust the temperature controller to zero point. When using the compensation wire and cold end compensator, adjust the mechanical zero point to the reference temperature point of the cold end compensator. For the wire, the mechanical zero is adjusted to the zero scale, but the temperature indicated is the temperature difference between the measuring point and the cold end of the thermocouple. 5. Set the temperature to the required operating temperature and then turn on the power. When the work is turned on, the electric furnace is energized, and the display panel has input current, voltage, output power display and real-time temperature display. As the internal temperature of the electric furnace increases, the real-time temperature will also increase. This phenomenon indicates that the system is working normally. Daily maintenance precautions 1. When the muffle furnace is used once or used for a long time, it must be oven-dried. The oven should be at room temperature 200 ° C for four hours. 200 ° C to 600 ° C for four hours. When using, the furnace temperature must not exceed the rated temperature to avoid burning the heating elements. It is forbidden to infuse the furnace with various liquids and easily soluble metals. The muffle furnace is better than 50°C below the high temperature of zui, and the furnace has a long life. 2. The muffle furnace and controller must work in a location where the relative humidity does not exceed 85% and there is no conductive dust, explosive gas or corrosive gas. When a metal material such as grease is required to be heated, a large amount of volatile gas in the Luoyang Minghao furnace industry will affect and corrode the surface of the electric heating element to destroy and shorten the life. Therefore, when heating, it should be prevented and sealed in a timely manner or properly opened to eliminate. 3. The muffle controller should be limited to use in the ambient temperature range of 0-40 °C. 4. According to the technical requirements, regularly check whether the wiring of each electric furnace and controller is good. Each thermocouple connected to the controller may cause interference to the controller, and the controller may display a jump value and increase the measurement error. The higher the furnace temperature, the more obvious this phenomenon is. Therefore, be sure to ground the thermocouple's metal protection tube (housing) well and, if necessary, use a three-wire output thermocouple. In short, all effective measures should be taken to reduce interference. 5, the thermocouple should not be pulled out at high temperature to prevent the jacket from bursting. 6. Always keep the furnace clean and remove the oxides in the furnace in time. 7. During the use process, when the sample is melted with alkaline substances in the furnace or the precipitate is burned, the operating conditions should be strictly controlled. The refractory plate is pre-laid on the bottom of the furnace to prevent corrosion of the furnace. Daily use safety technology operating procedures 1. Do not exceed the high temperature of the resistance furnace. 2. Always turn off the power when handling the sample to prevent electric shock. 3. When the sample is taken, the opening time of the furnace door should be as short as possible to prolong the service life of the electric furnace. 4. It is forbidden to infuse any liquid into the furnace. 5. Do not put samples with water and oil into the furnace; do not use a clip with water and oil to take the sample. 6. Wear gloves when handling samples to burn. 7. The sample should be placed in the middle of the furnace, placed neatly, and should not be placed indiscriminately. 8. Do not touch the electric furnace and surrounding samples. 9. Turn off the power and water source after use. 10. Do not operate the resistance furnace without the permission of the management personnel, and strictly follow the operation rules of the equipment. Shangyu Xingxing Instrument Equipment Co., Ltd. is located in Daoxu Town, Shangyu District, Shaoxing City, Zhejiang Province. It is an enterprise integrating production, product research and development, processing and trade. The company's main products: drying box series, incubator series, laboratory muffle furnace series, distilled water series, as well as clean workbench, air shower, fume hood, biological safety cabinet and other complete purification equipment. The company has a strong technical research and development team, a strong after-sales guarantee service system, is the leader in China's laboratory complete sets of equipment manufacturers, welcome customers to buy. 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