Thermostatic biological shakerAs the core equipment for cell culture, microbial fermentation and other experiments, its stability directly affects the experimental results. The following are 5 key inspection items that need to be paid attention to in daily maintenance to help users extend equipment life and reduce failure rates.

1. Temperature sensor calibration and stability check

Inspection cycle: once a month (high-precision experiments are recommended to be conducted once a week).

Operation Method:

Compare the temperature displayed on the shaker with a standard thermometer (accuracy ± 0.1 ℃), and the error should be ≤ ± 0.5 ℃.

If the error exceeds the standard, it is necessary to contact the engineer to calibrate the sensor (to avoid self disassembly causing seal failure).

Case: Due to the lack of temperature calibration in a certain laboratory, the cell culture temperature fluctuated by 2 ℃, resulting in poor experimental reproducibility.

2. Monitoring the operating status of motors and transmission systems

Inspection items:

Noise: During normal operation, the noise level should be ≤ 55dB. Abnormal noise (such as metal friction noise) should be stopped for inspection.

Vibration: There is no significant vibration when touching the outer shell of the shaking table. If the vibration intensifies, it may be due to belt looseness or bearing wear.

Speed: Use a tachometer to detect the actual speed and the set value with an error of ≤± 2rpm.

Maintenance suggestion:

Clean the motor cooling fan quarterly to avoid dust accumulation and overheating.

Replace the drive belt annually (if it is a belt driven type).

3. Sealing ring and internal cavity anti pollution maintenance

Sealing ring inspection:

Check the door seal every month for aging or cracking, and replace it if necessary (aging seals can cause temperature/humidity leaks).

Avoid using chlorine containing disinfectants during cleaning, and recommend wiping with 75% alcohol.

Internal cavity cleaning:

Immediately clean the residual culture medium after the experiment (to prevent corrosion of the stainless steel inner wall).

Stubborn stains can be soaked in a weak alkaline cleaner (pH 7-9) and wiped off.

4. Refrigeration system pressure and refrigerant detection

Inspection items:

Pressure gauge reading: The pressure on the high-pressure side of the compressor should be between 1.2-1.8MPa (at an ambient temperature of 25 ℃), and refrigerant leakage may occur below this range.

Condenser cleaning: Clean the condenser fins of dust every six months to ensure heat dissipation efficiency.

Risk statement

Refrigerant leakage can cause compressor overload, and long-term operation may burn out the motor.

If oil stains (leakage of refrigerant mixed with refrigeration oil) are found, the machine should be stopped immediately for repair.

5. Safety verification of power and grounding systems

Inspection items:

Voltage stability: Use a multimeter to detect input voltage fluctuations of ≤ ± 5% (such as 220V ± 11V).

Grounding resistance: The grounding wire resistance should be ≤ 4 Ω (to prevent safety accidents caused by leakage).

Plug/socket: Check for burnt or loose connections to avoid equipment damage caused by poor contact.

Preventive measures:

Equipped with a regulated power supply (especially in areas with unstable voltage).

Avoid multiple high-power devices sharing the same socket.

Maintenance Summary Table

User Action Suggestions

Establish and maintain records: Record each inspection data (such as temperature errors, pressure values) for easy tracking of equipment status.

Spare parts reserve: Reserve vulnerable parts such as sealing rings and belts in advance to shorten maintenance downtime.

Train operators: Ensure that laboratory personnel are familiar with basic maintenance skills such as cleaning and handling of abnormal situations.

By strictly implementing the above 5 key inspection items, significant reductions can be achievedThermostatic biological shakerFailure rate, extending the service life to more than 10 years (industry average life is about 5-8 years), while ensuring the reliability of experimental data.