Principle and use of magnetic stirrer

Magnetic stirrer principle

The magnetic stirrer uses the same nature of the magnetic material to repel the magnetic stirrer by continuously changing the polarity of both ends of the base.

Magnetic stirrer is suitable for simultaneously heating or heating with stirring is not applicable to large viscosity of the liquid, or a solid-liquid mixture using a magnetic field and the vortex principle, after the liquid into the container while stirring into the liquid, if after the magnetic field is generated to drive the base stirrer in a circular motion cycle, so as to achieve the purpose of stirring the liquid: properties of the magnetic material repel each other by changing the polarity of both ends of the base to drive the rotation of the magnetic stirrer.

The magnetic stirrer adopts high-quality DC motor, which has low noise and stable speed regulation. The fully enclosed heating plate can be used for auxiliary heating. The magnetic stirrer can set the temperature and temperature display, can be used for long-term heating, and the digital display is intuitive and accurate. The stirrer made of PTFE and high-quality magnetic steel is resistant to high temperature, abrasion, chemical corrosion and magnetic. It can be mixed in a closed container, which is very convenient and convenient to use.

Magnetic stirrer use:

First check if the accessories are complete, then install the fixtures in order, place the required beakers in the middle of the chrome plate, add the solution to place the stirrer in the beaker solution, and fix the temperature probe to the rubber chuck. On the top, store the metal rod in the beaker, be careful not to affect the stirrer too much, then plug in the power plug of the instrument first, then turn on the power to turn on the power speed switch, the indicator light is on, that is, work starts.

The speed regulation is gradually adjusted from high speed to high speed, and the high speed gear is not allowed to start directly, so as to prevent the stirring sub-synchronization and cause jumping. Heating has switch control, open the heating source switch, select the required temperature, the green light indicates the heating plate works, the red light indicates that the heating plate is stopped, at this time enter the constant temperature state, the power should be cut off when not working, in order to ensure safety, use Please connect the ground wire. The instrument should be kept clean and dry. It is forbidden to enter the machine into the machine to avoid damage to the machine to prevent severe vibration.

1. Turn on the power, prepare the cup, open the stainless steel container cover, place the cup in the middle of the stainless steel container, add the heat transfer oil or silicone oil to the stainless steel container to the appropriate height, and place the stirrer into the cup solution. Turn on the power switch, the indicator light is on, turn the speed potentiometer in a clockwise direction, and the stirring speed is slow to fast. Adjust to the required speed.

2. To heat, connect the temperature sensor probe, clamp the probe on the bracket, and move the bracket to insert the temperature sensor probe into the solution to be no less than 5 cm, but it can not affect the stirring. Turn on the temperature control switch, set the required temperature, press the temperature control device + , - set the constant temperature, the meter display value is the actual temperature in the cup, the heating stops, the automatic constant temperature, the instrument can be heated continuously for a long time .

3. If the stirrer appears in the work, please turn off the power and then turn it on again. The speed will be slow to fast, and the adjustment will resume normal operation.

4,

Maintenance of the magnetic stirrer:

1. Place the test bottle (or other utensils) containing the solution and stirrer on the top plate of the work surface.

2. Turn on the external power supply, close the power switch, and the indicator light is on.

3. Select heating. When the heating switch is closed, the indicator light is on and it can be heated.

4. Adjust the speed control knob and raise it to the required speed. If you need two-way stirring, turn the direction selector switch to "two-way". (the indicator light is on)

5. After the magnetic stirrer is finished, set the speed control knob to the minimum position, the heating switch is in the non-working state, turn off the power switch, and cut off the power.

6. Wipe the top plate of the magnetic stirrer working surface, and allow water droplets on the upper part to remove dirt.