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The Maintenance Of Low-temperature Circulating Pump

Technical Knowledge 2021-12-30 09:13:32
The cryogenic coolant circulation pump is a combination of a circulating pump and a cryogenic cooling pump. It is a good auxiliary equipment for vacuum distillation and vacuum concentration. It is especially adapted to be equipped with a rotary evaporator, which not only reduces the use space, but also reduces the vacuum degree and saves water resources. It is widely used in modern laboratories.

LABOAO's DLSB series Chilling Circulator adopts air-cooled fully enclosed compressor unit refrigeration and microcomputer intelligent control system, providing low-temperature cooling liquid flow or low-temperature constant-temperature liquid flow to meet the needs of cooling water and cryogenic liquid for cooling or constant temperature instruments. Such as rotary evaporator, electron microscope, low temperature chemical reaction kettle, electron energy spectrometer, density meter, freeze dryer, reaction kettle, etc. It is also possible to directly pour multiple solvents into its tank for low-temperature and constant-temperature experiments.

Circulating Chiller is easy to use, but regular maintenance work cannot be ignored. There are many seemingly faulty problems that are actually caused by not doing regular maintenance. Both the electric power of the water chiller and the heat taken by the refrigerant from the load need to be removed from the radiator at the front hood. If the front hood is full of dust, it will hinder the dissipation of this heat, and the cooling effect will be greatly reduced. Generally speaking, under normal use conditions, the decrease in cooling capacity is caused by poor ventilation and heat dissipation or too high ambient temperature.

Although there are few impurities in the water, even if distilled water is added to the water tank, it is impossible to completely guarantee that there are no impurities. The water circulation of the low-temperature cooling circulation pump is generally set at 20°C, which is particularly suitable for the growth and reproduction of microorganisms. After a long period of time, these microorganisms will block the water filter, resulting in poor return water, and the pump will produce louder noise. Sometimes, these microorganisms adhere to the surface of the heat exchanger, which will result in poor heat transfer and low cooling capacity. Therefore, it is necessary to carry out daily maintenance work strictly in accordance with the requirements of the manual, clean the inner tank regularly, and stop using it for a long time to keep the inner tank dry.

In the process of using the instrument, due to improper use or routine maintenance, there will often be some failures of this kind. So how do we deal with these problems? Below we analyze some actual failure problems.

1. Fault: No temperature displays.

 Possible reasons: check whether the circuit board connection wire is off, whether the sensor is off, whether the circuit board is splashed.

Solution: plug in the connecting wire, dry the circuit board and then turn it on.

2. Fault: No cooling or slow cooling speed.

 Possible reasons: Whether the system is leaking, whether the system is blocked.

Solution: Ask a professional to repair it.

3. Fault: No external circulation. 

Possible reasons: Whether the circulating pump is blocked, whether the power box is off, whether the valve is open, whether there is icing in the circulating pump.

Solution: Check the connection line, remove the blockage, and open the valve.

4. Fault: The whole machine has no power.

Possible reasons: leakage protector protection, fuse blown, power supply phase sequence is connected wrong.

Solution: Adjust the position of the two live wires, replace the fuse, and reset the leakage protector.


In fact, the experimenter should strengthen the daily maintenance and maintenance of the experimental instrument. This not only prolongs the service life of the instrument, but also improves the utilization efficiency.

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