Precautions and maintenance of cryostat operation

Low temperature thermostats are generally heated by resistance wires, compressors are cooled, and an auxiliary PID controller is used to maintain a relatively standard temperature to achieve the experimental purpose. The outer shell is made of metal plates, and the control box is directly installed on the water tank. There are two condensate pipes in and out of the water nozzle, and the imported high-quality water pump is used as the circulating power in the water tank, which solves the disadvantage of uneven temperature water, so that the temperature control accuracy of the low-temperature constant temperature bath and the uniformity of water can meet higher requirements.

1. If it is the first time to use a cryostat, please read the manual and relevant materials in detail before using it, and earnestly grasp its structural principles, performance indicators, operating procedures, maintenance and related precautions.

2. Before using the cryostat, you must carefully check whether the connections and external wiring (parts) between the equipment are correct and normal, check whether the power plug is correctly inserted, whether the voltage, frequency, and indicator meet the instrument's requirements, and check whether the equipment is normal status

3. The liquid medium must be added into the cryostat before use, otherwise the heater will be damaged when the power is turned on, and the liquid level of the medium should be about 30mm lower than the worktable.

4. The selection of the liquid medium in the low-temperature constant temperature bath should meet the following principles:

a. When the working temperature is 5 ~ 85 ℃, the liquid medium is generally water;

b. When the working temperature is 85 ~ 95 ℃, the liquid medium can choose 15% glycerin aqueous solution;

c. When the working temperature is lower than 5 ℃, the liquid medium generally uses alcohol or freezing liquid.

5. After the refrigeration switch of the cryostat is turned off, the refrigeration switch should be turned on again at intervals of 10 ~ 20 minutes (depending on the ambient temperature).

6. If the water, electricity or gas source fails or is interrupted during the experiment, the relevant switches that affect the safety of the cryostat should be turned off immediately, and safety protection measures should be implemented

7. The low temperature thermostat should be placed in a dry and ventilated place with no obstacles within 300mm around the instrument. When the working temperature of the low-temperature constant temperature bath is low, care should be taken not to enter the bath to prevent frostbite.

8. After use, all switches are turned off to cut off the power. The low temperature thermostat should do regular cleaning work to keep the work surface and operation panel clean.

The maintenance and maintenance of the cryostat is the basic requirement for a good constant temperature test, and the maintenance and maintenance of the cryostat is related to the intact rate, utilization rate of the cryostat and the opening rate of experimental teaching, and the success rate . Therefore, as a member of the laboratory, you should understand the general knowledge of low temperature thermostat maintenance and maintenance, and master the basic skills of maintenance and maintenance.

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