Do you really know how to use an overhead mixer properly?

The overhead stirrer, as a basic laboratory equipment, looks simple, but there are still many precautions in actual use. Do you really know how to use it properly? Let me take you to understand it in detail.

Correct and standardized operation can extend the service life of the overhead stirrer. Stainless steel stirring paddle for salt solution mixing, where the salt solution contains chloride ions, if you can not clean 

in time after use, rust stains and corrosion will occur after a period of time.

Research shows that the chloride ion content is greater than 25ppm, stainless steel will occur stress corrosion, pore corrosion, intergranular corrosion. Therefore, in the experiment, attention must be paid to 

timely cleaning and maintenance in order to extend the service life of the stainless steel stirring paddle.

Overhead stirrer is a large-capacity mechanical stirring equipment, product features.

1. Stainless steel chuck, durable.

2. Digital display models, speed and time can be coarse adjustment, in the working state can be fine-tuned to the working time.

Overhead stirrer stirring volume and viscosity relationship: the general stirrer stirring volume is water as a reference, the actual application, the sample will have a different range of viscosity, viscosity increases 

and stirring volume is not exactly the inverse relationship, you can not choose the viscosity increased by 10 times, while the stirring volume is reduced by 10 times directly for use.

Selection of stirring paddle: The shape of the stirring paddle directly affects the stirring effect. When the sample viscosity is relatively large, choose the anchor type stirring paddle, stirring can constantly stir the 

sample near the container wall, to prevent the sample from sticking to the wall of the container can not be mixed. If the sample is easily suspended on the surface of the liquid, you can choose the descending type. 

The rising type can be selected for samples that tend to settle, constantly stirring the sample.

The overhead stirrer derives the motor torque output when the current changes due to the change in load when the motor is running. However, this torque does not have any kind of proportional relationship 

with the viscosity of the sample. The overall output torque of the stirrer increases as the viscosity of the sample increases, but there is no proportional relationship. Therefore, the torque display cannot be used 

as a viscometer, and special viscosity measurement equipment is required if the sample viscosity is to be measured.

If the sample is corrosive and a conventional stainless steel stirrer is not sufficient for the application, a PTFE coated stirrer is available. However, PTFE material is soft, so you should pay attention to the use 

of rotational speed in the process.

As a reminder, when using the overhead stirrer, please check if the random accessories are complete first, then install the fixture first in order, insert the sensor probe for backup, place the solution for the required 

experiment in a beaker or flask, put the stirrer into the solution, and then place it in the bottom tank right in the middle.