Working principle of laboratory high temperature muffle furnace

1 Turn on the power, turn on the power switch, and the indicator light will be on, indicating that it is in the working state, and the instrument will display the indoor ambient temperature 2 Adjust the temperature control setting knob or dial switch on the temperature control instrument to the required temperature value When the green light on the instrument is on, it means that the electric furnace is being electrified and heated up, when the red light is on, it means power off and heat preservation, and when the green light changes alternately, it means constant temperature After 30 minutes of constant temperature, the temperature indicated by the instrument is basically consistent with the set value 3 KSW type is direct control type, without current regulation function As the heating element is gold wire, its resistance value is basically unchanged, so the power of electric furnace is constant, so direct control is OK 4 KSW type is current regulating type, and its controlled heating element is silicon carbide rod The characteristic of the silicon carbide rod is that the resistance value is very small at low temperature, so the power is very large, and the resistance value increases gradually with the increase of temperature, so the power needs to be adjusted at low temperature Its power is reflected in ammeter and voltmeter Note: the voltage displayed on the voltmeter is the output voltage, the product of which and the current is equal to its power [w], which cannot be greater than the rated power of the controller Therefore, before starting the machine, put the adjusting knob in the small position of Zui, and then gradually adjust it to the large position, and observe the display of the ammeter Do not suddenly adjust it to the large position of Zui 5 Leakage protector must be installed at the leading in of power supply 6 The current capacity of the power supply must meet the power demand of the electric furnace 7 The controller shall not be too close to the electric furnace 8 The indoor temperature shall not be greater than 85%, and inflammable, explosive and corrosive articles shall not be placed around it 9 Furnace body and controller shell must be properly grounded 10 When the electric furnace is used for * times or is out of service for a long time, it must be dried for four hours at room temperature to 200 ℃ and four hours at 200 ℃ to 600 ℃ 1300 ℃ electric furnace 200 ℃ for one hour, 200 ℃ to 500 ℃ for two hours, 500 ℃ to 800 ℃ for three hours, 800 ℃ to 1200 ℃ for two hours When in use, the furnace temperature shall not exceed Zui high temperature, so as to avoid burning the electric heating elements, and it is forbidden to pour various liquids and dissolved metals into the furnace 11 The electric furnace and controller must work in the place where the relative humidity is not more than 85%, there is no conductive dust, explosive gas and corrosive gas that can damage the metal insulation and electronic components 12 The working environment temperature of the controller is limited to 0-50 ℃ 13 According to the technical requirements, regularly check whether the connection of the electric furnace and the terminal at the back of the controller is good, whether the pointer of the indicator is stuck when it moves, and calibrate it with the potentiometer to avoid too large error due to various reasons Shangyu Star Instrument Equipment Co., Ltd is located in Daoxu Town, Shangyu District, Shaoxing City, Zhejiang Province It is an enterprise integrating production, product development, processing and trade The company's main products: drying box series, incubator series, laboratory muffle furnace series, distiller series, as well as clean workbench, air shower room, ventilation cabinet, biosafety cabinet and other complete sets of purification equipment The company has a strong technical research and development team, a strong after-sales service system, is the leading manufacturer of complete set of laboratory equipment in China, welcome customers to buy