First question, are there any special requirements for the temperature and heating voltage of the water in the thermostat? Why?
answer:
The temperature of the water in the tank should not be too large from the room temperature to reduce the rate of heat dissipation to the environment; the heating voltage should not be too small and too large. Otherwise, the heat dissipation speed will be too large, the heating speed will be too large, and the heating inertia will be large, which will reduce the sensitivity during temperature control. If the heating voltage is too small, the temperature of the system will be low for a relatively long time, or it may not reach the set temperature.
The second question, the temperature control principle of the constant temperature bath?
answer:
It automatically adjusts the heater through an electronic relay. When the temperature of the thermostatic bath is lower than the set value due to heat diffusion, the relay forces the heater to work, and when the system reaches the set temperature again, it automatically stops heating . Use a stirrer to make the heat even. While controlling the temperature, the constant temperature controller accurately reflects the temperature value of the temperature-controlled part.
The third question is, how to make a system maintain a constant temperature above room temperature?
answer:
01, system-static ideal thermal insulation between environments;
02. Dynamic approximate insulation between the system and the environment; when the system will continuously and steadily dissipate heat to the environment, the environment continuously and steadily transfers almost the same amount of heat to the system through another method
03. The relay-type temperature control device introduced in the experiment book.
Fourth question, how to improve sensitivity?
answer:
01. Constant temperature medium: the medium has good fluidity and large heat capacity, so the sensitivity is high.
02. Constant temperature meter: its heat capacity is small, the contact surface with the constant temperature medium is large, the adhesion between mercury and platinum wire and capillary wall is small, and the sensitivity is high.
03. Heater: The smaller the heating power, the higher the sensitivity.
04. Stirrer: The stirring speed must be large enough to make the temperature of each part of the constant temperature medium as consistent as possible.
05. Location of components: The heater is placed near the agitator, so that the heat is quickly transferred to all parts. The thermometer should be placed near the heater, and the temperature measuring thermometer should be placed near the system under study.
Question 5: What should I pay attention to when using Beckman thermometer?
answer:
01. Do not rotate at will. Beckman thermometer is a more expensive instrument. When using it, be bold and careful, hold it gently, and hold the middle part if necessary.
02. When adjusting, pay attention to prevent the polymerization
Heat so as not to burst the thermometer.
03. The thermometer should be vertical, otherwise the capillary is easily broken.
04. The adjusted thermometer must be placed on the thermometer holder. Do not connect the mercury column in the capillary tube with the mercury in the tank. Otherwise, it must be readjusted.
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