As the core equipment of the laboratory, the precision and stability of the magnetic stirring constant temperature water bath directly affect the experimental results. To ensure the long-term efficient operation of the equipment, a systematic maintenance plan needs to be established, covering four major modules: daily cleaning, regular calibration, component maintenance, and fault prevention.

1、 Daily cleaning and basic maintenance

1. Instant cleaning
After the experiment is completed, immediately turn off the power and drain the water tank. Use a soft cloth dipped in neutral detergent to wipe the inner container, focusing on cleaning the residual reagents at the junction of the mixing blade and the inner container. For example, a laboratory once experienced an increase in stirring resistance due to the failure to clean the crystallization of the buffer solution in a timely manner, which affected experimental efficiency. The outer shell should be wiped with a dry cloth to prevent liquid from seeping into the gaps of the control panel.

2. Water quality management
Add distilled or deionized water to reduce scale formation, and replace the water tank once a week. When not in use for a long time, the water tank should be emptied and dried to prevent bacterial growth or corrosion of the inner container. A research team has extended the service life of equipment by strictly implementing water quality management3Year.

2、 Regular calibration and precision maintenance

1. Temperature control system calibration
Compare the temperature displayed on the equipment using a standard thermometer every month, and the error exceeds±0.5℃Re calibration is required. The calibration methods include:

PIDParameter adjustment: through a temperature controller“SET”Enter the parameter setting interface with the key and adjust itSc(Error calibration value)E(breakpoint control advance)P(Proportional control value), to solve the problem of temperature overshoot or slow rise.

Sensor detection: Use a multimeter to measure the resistance value of the temperature sensor,PT100Sensors are in0℃The resistance value should be100ΩThe deviation is too large and needs to be replaced.

2. Optimization of mixing system

Stirring adapter: Choose corrosion-resistant materials (such as316LA stainless steel stirrer with a length equal to the diameter of the container1/2~2/3Ensure stable magnetic coupling.

Motor maintenance: Check the motor bearings every quarter and apply special lubricating oil to avoid lagging caused by lack of oil. A certain university laboratory has reduced the failure rate of the mixing system through regular lubrication70%.

3、 Deep maintenance of key components

1. Heating element maintenance

Scale cleaning: used monthly10%Circulating heating of citric acid solution1After hours, discharge and rinse with clean water3Secondly, to prevent scale from affecting heat conduction efficiency.

Resistance testing: Use a multimeter to measure the resistance value of the heating tube,220V/1000WThe resistance value of the heating tube is approximately48ΩIf there is an abnormality, it needs to be replaced.

2. Sealing and Electrical Safety

Sealing ring replacement: Check the upper cover sealing ring every six months, and replace it immediately when it hardens or deforms to prevent rapid evaporation of moisture from affecting temperature stability.

Circuit inspection: Regularly check whether the power cord is damaged, whether the plug contact is good, and replace aging circuits if necessary.

4、 Fault prevention and emergency response

1. Response to abnormal situations

Stirrer does not rotate: first check whether the motor is overheated. If it is normal, it may be that the drive belt is loose. Contact after-sales for adjustment.

Temperature runaway: Clean the heat dissipation holes, ensure good ventilation, and avoid using volatile media (such as ethanol) without covering them.

2. Emergency shutdown process
In case of leakage or abnormal noise during the experiment, immediately press the emergency stop button, cut off the power, and investigate the cause.

By implementing the above maintenance plan, the temperature control accuracy of the magnetic stirring constant temperature water bath can be stabilized at±0.5℃Within, the service life is extended3-5Year. The laboratory should establish maintenance records, recording the time of each maintenance and replacement of parts, to achieve full lifecycle management of equipment.