Common faults and solutions in the use of low temperature constant temperature bath

Common failures and solutions in the use of low-temperature constant temperature bath as a high-precision constant temperature source for refrigeration and heating, as well as the unique internal and external circulation function, are loved by the majority of users in the laboratory, so what failures are often encountered in the use of low-temperature constant temperature bath, and what are the corresponding solutions? 1 When the low temperature constant temperature bath is operated for times, the instrument will not be heated or cooled What's the matter? The low-temperature constant temperature bath generally adopts the compressor integrating heating and cooling, which can avoid the multiple operation of the instrument program and extend the heating and cooling time The instrument is generally equipped with heating insurance and cooling insurance Generally, the instrument is not heated or cooled You can check whether the heating insurance or cooling insurance of the instrument is loose first If not, you can unscrew the baoxiangtao, Check whether the fuse is burnt out If the fuse instrument is replaced in time, it can operate normally 2 The low-temperature constant temperature bath has been used for more than one year, and the cooling speed is becoming slower and slower Answer: many problems and faults of the low-temperature constant temperature bath seem to be caused by the lack of regular maintenance The electric power of the water cycle of the low-temperature constant temperature bath and the heat taken away by the refrigerant from the load need to be discharged from the radiator at the front ventilation hood If the front ventilation hood is full of dust and willow cotton, etc., it will hinder the emission of these heat, and the refrigeration effect will be greatly reduced Generally speaking, the decrease of cooling capacity under normal use conditions is caused by poor ventilation and heat dissipation effect or high ambient temperature In addition, timely maintenance shall be carried out in the tank If it is not used for a long time, it shall be cleaned in time and kept dry 3 Water circulation used to be very normal, but now it is found that the noise is much greater than before? A: this problem is also related to the water circulation of low-temperature thermostatic bath As we all know, there are very few impurities in the water Even after the distilled water is added to the water tank, it is impossible to completely guarantee that there are no impurities For the water cycle, the general temperature is set at 20 ℃, which is particularly suitable for the growth and reproduction of microorganisms After a long time, these microorganisms will block the filter of the water path and cause poor return water, and the water pump will have a large noise Sometimes these microorganisms attach to the surface of the heat exchanger, resulting in poor heat transfer effect of the heat exchanger and smaller cooling capacity Therefore, do a good job in daily maintenance, clean the inner tank regularly, stop using for a long time, and keep the tank dry For daily cleaning and precautions, please refer to the precautions of low temperature constant temperature bath 4 There is air leakage in the external circulation of the low-temperature constant temperature bath Sometimes there are a few drops on the ground Is there a local leakage on the water? Generally speaking, all the interfaces in the process of instrument transfer are sealed by high-strength rubber industry, and there will be no leakage on the water But sometimes when the ambient temperature is relatively high and the relative humidity in the air is too high, due to the low temperature operation, the water pump, water pipe joint and external water pipe in the water circulation are easy to condense dew, which will drop to the ground after more accumulation, not the water leakage, which can be put into use If you feel that this operation is not very reassuring, you can turn on the air conditioner to reduce the indoor temperature.