The constant temperature oil bath is a commonly used experimental equipment. In the process of using it, the following matters need to be noted to ensure the normal operation of the equipment and the accuracy of experimental results, as well as the safety of operators.

I. Preparations before operation

Select appropriate heat transfer oil

According to the working temperature range of the constant temperature oil bath, select the corresponding type of heat transfer oil. The performance of the heat transfer oil should be stable and not easily decompose or deteriorate at high temperatures to ensure good heat transfer effect and service life.

Check the liquid level of the heat transfer oil to ensure that it is within the normal range. Too low a liquid level will affect the heating effect and may even damage the heating element; too high a liquid level may overflow during the heating process, causing safety hazards.

Equipment inspection

Conduct a comprehensive inspection of the appearance of the constant temperature oil bath, including whether the shell is damaged or cracked, and whether the connections of various components are tight. If damage is found on the shell, it may affect the thermal insulation performance and safety of the oil bath and should be repaired or replaced in time.

Confirm whether the heating system, temperature control system and stirring device are working properly. Check whether the heating element is intact, whether the temperature sensor is accurate, and whether the stirring motor runs smoothly.

Check whether the power cord is firmly connected and whether the grounding is good. Good grounding can prevent leakage accidents and ensure the safety of operators.

II. Key points to note during operation

Temperature setting and control

When setting the temperature of the constant temperature oil bath, it should be adjusted step by step according to the experimental requirements to avoid temperature overshoot. Temperature overshoot may damage the experimental sample or equipment and also affect the temperature stability.

Closely monitor the temperature change. When the temperature is close to the set value, the heating power can be appropriately reduced to make the temperature slowly and stably reach the set value. During the experiment, if the temperature needs to be adjusted, the principle of slow adjustment should also be followed.

Regularly check the accuracy of the temperature control system and compare it with a standard thermometer. If a large temperature deviation is found, calibration or repair should be carried out in time.

Stirring speed adjustment

The function of the stirring device is to make the oil temperature in the oil bath uniform. According to the experimental requirements, adjust the stirring speed reasonably. Generally speaking, at the initial stage of heating, the stirring speed can be appropriately increased to accelerate heat transfer; when the temperature is stable, the stirring speed can be appropriately reduced to reduce energy consumption and equipment wear.

Pay attention to observing the operation of the stirring device. If problems such as loose stirring blades, deformation or abnormal noise of the stirring motor are found, stop using it immediately and carry out repair or replacement.

Sample placement and operation

When placing the sample into the constant temperature oil bath, use appropriate tools to avoid directly touching the high-temperature oil liquid with hands to prevent burns. At the same time, make sure that the sample is completely immersed in the oil liquid to ensure uniform heating.

During the operation process, try to avoid violent disturbance to the oil liquid in the oil bath to avoid affecting the uniformity and stability of the temperature. If stirring or other operations are required for the sample, the actions should be gentle and slow.

III. Safety protection

Prevent burns

The constant temperature oil bath has a relatively high temperature during operation. Operators should wear protective equipment such as heat-insulating gloves and protective glasses. When adding heat transfer oil, placing or taking out samples and other operations, be especially careful to prevent hot oil from splashing and scalding the skin.

Set up warning signs to remind other people to pay attention to high temperature hazards and prevent irrelevant people from approaching the operating constant temperature oil bath.

Fire and explosion prevention

The heat transfer oil may volatilize and produce combustible gas at high temperatures. Therefore, the place where the constant temperature oil bath is used should maintain good ventilation to remove combustible gas and reduce the risk of fire and explosion.

It is strictly prohibited to place flammable and explosive items such as alcohol and gasoline near the oil bath. At the same time, corresponding fire extinguishing equipment such as fire extinguishers and fire extinguishing sand should be equipped so that fires can be extinguished in time when they occur.

Electrical safety

Regularly check the electrical circuit of the constant temperature oil bath to ensure that the power cord is free from damage and aging, and the plug and socket are firmly connected. Avoid electrical failures such as leakage and short circuit.

During the operation of the equipment, if electrical abnormalities such as peculiar smell, smoke or sparks are found, the power should be cut off immediately and professional maintenance personnel should be contacted for inspection and repair.

IV. Maintenance and cleaning after use

Equipment shutdown

After the experiment is over, first set the temperature of the constant temperature oil bath back to room temperature, then turn off the heating system and stirring device. After the oil temperature in the oil bath drops to room temperature, turn off the power.

Clean the oil bath

Clean up the residual samples and impurities in the oil bath in time. Special cleaners and tools can be used for cleaning. After cleaning, rinse with clean water and dry with a dry cloth or let it air dry naturally to ensure that the inside of the oil bath is dry and free of dirt residues.

Heat transfer oil treatment

If the heat transfer oil needs to be replaced, drain the old heat transfer oil into a special container and handle it in accordance with environmental protection requirements. When adding new heat transfer oil, pay attention to avoiding the mixing of impurities to ensure the quality of the heat transfer oil.

Equipment maintenance

Regularly carry out comprehensive maintenance on the constant temperature oil bath, including checking the performance of heating elements, temperature sensors, stirring devices, etc. If there is wear or damage, it should be replaced in time. At the same time, clean and rust-proof the appearance of the equipment to extend the service life of the equipment.

In short, correct use and maintenance of the constant temperature oil bath is the key to ensuring the smooth progress of experiments and the safe operation of equipment. Operators should strictly abide by the operating procedures, pay attention to safety matters, and regularly inspect and maintain the equipment to ensure that the constant temperature oil bath is always in good working condition.