Thermostatic water bath is a commonly used experimental equipment. The following are the general usage steps:
Check equipment:
Before use, carefully check whether the various connection parts of the equipment are tight to ensure that there is no risk of liquid leakage.
Add media:
According to the experimental requirements, add a suitable low-temperature medium to the reaction bath. Common low-temperature media include ethanol, ethylene glycol, propylene glycol, etc. The amount of addition should be determined according to the volume of the reaction bath and experimental requirements. Generally, it is necessary to ensure that the medium can immerse the reaction vessel, but it should not be too full. Usually, it can be added to about 80% of the volume. For example, if the volume of the reaction bath is 10L, adding about 8L of medium is more suitable.
Place the reaction vessel:
Place the container that needs to undergo a constant temperature reaction into the reaction bath, ensuring that the container is placed smoothly and in full contact with the medium inside the reaction bath to ensure good heat exchange.
Set temperature:
Set the desired constant temperature through the temperature adjustment button on the control panel. Generally, the temperature value can be directly entered using the numeric keypad, or gradually adjusted through the up and down adjustment buttons.
Set the stirring speed (if there is a stirring function):
The adjustment of mixing speed is usually done through the corresponding buttons on the control panel, which can be gradually adjusted from low to high, observing the mixing effect and finding the suitable mixing speed for the experiment.
Observe the operating status:
During the operation of the device, observe whether the temperature display is stable around the set value. Usually, devices have a certain range of temperature fluctuations, but the fluctuations should not be too large. For example, setting the temperature to -10 ℃ and the temperature fluctuation range within ± 0.5 ℃ is relatively normal. Meanwhile, observe whether the mixing is running normally and whether there are any abnormal noises.
Waiting for the temperature to stabilize:
It takes some time for the temperature inside the reaction bath to reach the set constant temperature state. The duration of this time depends on various factors, such as initial temperature, set temperature, amount and properties of the medium, equipment power, etc. Generally, it may take several minutes to several tens of minutes. After the temperature stabilizes at the set value, the experimental reaction can begin.
Stop reaction:
After the experiment is completed, first stop the ongoing chemical reaction, such as turning off the heating or stirring devices on the reaction vessel and other related equipment.
Remove the reaction vessel:
Remove the reaction vessel from the low-temperature constant temperature reaction bath, taking care to avoid splashing the reaction solution.
Cleaning equipment:
If the medium in the reaction bath needs to be replaced or cleaned, it can be discharged after the equipment is turned off and cooled down. Wipe the inside and outside of the reaction bath with a clean cloth to keep the equipment clean and ready for the next use.
When using a thermostatic water bath, it is necessary to strictly follow the instructions of the equipment to avoid experimental failure or equipment damage caused by improper operation.
