Common problems and precautions for using the cryostat
Question 1: The water circulation in the low temperature bath is normal before use, but now the noise is much larger than before. What is the reason?
Reason: As mentioned above, the daily maintenance work of the water cycle is also related to this problem. Everyone knows that there is a small amount of impurities in the water, that is, after the distilled water is added to the water tank, it is impossible to completely guarantee that there is no impurity at all. For the water cycle, the general temperature is set at 20 ° C , which is especially suitable for the growth and reproduction of microorganisms. After a long time, these microorganisms will block the filter of the waterway, causing poor water return and the pump will have a large noise. Sometimes these microorganisms are attached to the surface of the heat exchanger, causing the heat transfer effect of the heat exchanger to be deteriorated and the cooling capacity to be small. Therefore, we must do the routine maintenance work in strict accordance with the requirements in the manual, regularly clean the inner tank, and stop it for a long time to keep the tank dry. There seems to be a leak in the water cycle. Sometimes there are a few drops on the ground. Is there a leak on the waterway? Generally speaking, there is no leakage in the waterway during normal use. When the relative humidity in the high ambient air is too large, the water pump, the water pipe joint, and the external water pipe in the water circuit of the water circulation are likely to condense dew. After accumulating more, it will drip onto the ground, and there is no need to worry that there is water in the waterway. The place where the water leaks. If you are concerned about this, turn on the air conditioner to lower the room temperature or dehumidify to avoid dew.
Question 2: The water circulation in the low temperature thermostat has been used for more than a year. Normally, the cooling rate seems to be getting slower and slower. The higher the temperature, the more obvious it is.
Reason: Water recycling is simple, but regular maintenance work can't be ignored. There are a lot of seemingly faulty problems that are caused by not doing regular maintenance. The electric power of the water cycle itself and the heat taken away by the refrigerant from the load need to be removed from the radiator at the front hood. If the front hood is filled with dust and cotton wool, it will hinder the heat dissipation, and the cooling effect will be Great discount. Generally, the decrease in cooling capacity under normal use conditions is caused by poor ventilation or high ambient temperature.
Special considerations for the cryostat:
1. The selection of liquid medium in the cryostat should meet the following principles:
When the working temperature is between 5 and 85 ° C , the liquid medium is generally selected from water;
When the working temperature is 85 ~ 95 ° C , the liquid medium can be selected with 15% glycerol aqueous solution;
When the working temperature is higher than 95 ° C , the liquid medium is generally selected oil, and the open cup flash point value of the selected oil should be higher than the working temperature of 50 ° C or more;
Note: The working temperature here refers to the temperature to be reached by the liquid medium in the tank;
2 , using low temperature tank - low temperature thermostatic tank into the front tank to add liquid medium, the liquid level of the medium should be about 30mm below the tabletop , otherwise the heater will be damaged when energized;
3 , power supply: 220V50Hz , the power supply should be greater than the total power of the instrument, the power supply must have a good " grounding " device;
4. When the working temperature of the constant temperature bath is high, care should be taken not to open the upper cover, and do not enter the tank to prevent burns;
5 , after use, all switches are turned off, cut off the power;
The instrument should be cleaned regularly to keep the work surface and operation panel clean;
Always pay attention to observe the level of the liquid level in the tank. When the liquid level is too low, the liquid medium should be added in time;
In view of safety factors, we have specified an internal circulation of a thermostatic bath above 100 °C . If the external cycle is changed according to the customer's requirements, the customer should pay special attention to the firmness of the connection of the pipe to prevent it from falling off to avoid burns.
6. The instrument should be placed in a dry and ventilated place with no obstacles within 300mm around the instrument ;
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