A hot air circulation oven is a device that heats an object by heating elements. The hot air circulation oven is suitable for baking, drying, heat treatment, etc. in the range of 5 to 300 ° C (some 200 ° C higher) than room temperature, and the sensitivity is usually ±1 ° C. It has many models, but the basic structure is similar. The general hot air circulation oven consists of three parts: the box, the electric heating system and the automatic temperature control system.
The hot air circulation oven usage and precautions are summarized as follows:
1. The hot air circulation oven should be placed indoors in a dry and level place to prevent vibration and corrosion.
2. Pay attention to safe use of electricity, install a power supply knife with sufficient capacity according to the power consumption of the hot air circulation oven. Use enough power leads and have a good grounding wire.
3. The hot air circulation oven with the electric contact mercury thermometer type thermostat should connect the two wires of the electric contact thermometer to the two terminals on the top of the box. In addition, an ordinary mercury thermometer is inserted into the exhaust valve. (The thermometer in the exhaust valve is used to check the electrical contact mercury thermometer and observe the actual temperature inside the box.) Open the exhaust valve hole. Adjust the electric contact mercury thermometer to the required temperature and tighten the screws on the steel cap to achieve the purpose of constant temperature. However, care must be taken not to turn the indicator iron out of the scale when adjusting.
4. When all preparations are ready, put the sample into the hot air circulation oven, then connect and turn on the power. The red indicator light indicates that the box is heated. When the temperature reaches the controlled temperature, the red light turns off and the green light is on, and the temperature is started. In order to prevent temperature control failure, you must also look after it.
5. When placing the sample, please note that the arrangement should not be too dense. The test piece should not be placed on the heat sink to avoid affecting the upward flow of hot air. It is forbidden to bake flammable, explosive, volatile and corrosive items.
6. When you need to observe the sample in the working room, you can open the outer door and observe through the glass door. However, it is better to open the door as little as possible to avoid affecting the constant temperature. Especially when working above 200 °C, opening the door may cause the glass door to quench and rupture.
7. There is a hot air circulation oven with blasting. The blower must be turned on during heating and constant temperature, otherwise the uniformity of the temperature of the working chamber and the damage of the heating element will be affected.
8. After the work is completed, the power should be cut off in time to ensure safety.
9. Keep the inside of the hot air circulation oven clean inside and outside.
10. When using, the temperature should not exceed the maximum operating temperature of the hot air circulation oven.
11. To prevent burns, use special tools when handling samples.
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