News

1. What is the temperature control principle of the thermostatic bath?

Answer: It automatically adjusts the heater through the electronic relay. When the temperature of the thermostatic bath is lower than the set value due to the outward diffusion of heat, the relay forces the heater to work, and when the system reaches the set temperature again, it will automatically Stop heating. Heat evenly with a whisk. The thermostatic controller accurately reflects the temperature value of the temperature-controlled part while controlling the temperature.

2. How many ways can a system be maintained at a constant temperature higher than room temperature?

Answer:  (1) Ideal static insulation between system and environment;

          (2) Dynamic approximate adiabatic between the system and the environment; when the system continuously and stably dissipates heat to the environment, the environment transfers almost the same amount of heat to the system continuously and stably through another method of heat;

          (3) The relay-type temperature control device introduced in the experiment book.

3. What should I pay attention to when using a Beckman thermometer?

Answer:   (1) Do not rotate at will. The Beckman thermometer is a relatively expensive instrument. It should be used boldly and carefully, handle it with care, and hold the middle of it if necessary.

4. How to improve the sensitivity of the thermostatic bath?

Answer:   (1) Constant temperature medium: The medium has good fluidity and large heat capacity, so the sensitivity is high.

          (3) Heater: The smaller the heating power, the higher the sensitivity.

       The thermometer should be placed near the heater, and the thermometer that measures the temperature should be placed near the system under study.

5. Are there any special requirements for the temperature and heating voltage of the water in the constant temperature bath? Why?

Answer: The temperature of the water in the tank should not be too different from the room temperature to reduce the heat dissipation rate to the environment; the heating voltage should not be too small or too large. Otherwise, the heat dissipation speed will be too large, the heating speed will also 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 the set temperature will not be reached.