At present, there are many kinds of centrifuges on the market, such as high-speed centrifuges, low-speed centrifuges, refrigerated centrifuges, etc. Among them, there are a wide range of low-capacity low-speed electric centrifuges, which are routine laboratory instruments with beautiful appearance, large capacity and small volume. ,full functioning. Its performance is stable, the speed is adjustable and it can automatically adjust the balance, the temperature rise is low, the use efficiency is high, and the applicability is wide. Widely used in biological, chemical, pharmaceutical and other scientific research and education, production departments, pharmaceutical products, blood stations, clinical trials and biochemical laboratories for qualitative analysis of serum, plasma, urea, radioimmunoassay and separation of cells and large particles.
But we sometimes have the following problems in daily use. How do we solve it?
1. Fault phenomenon: It is found that both high speed and low speed are unstable.
Trouble-shooting: The centrifuge is a DC-type speed-regulating motor. The speed of the centrifuge is changed by the adjustable resistance to change the conduction angle of the thyristor and then controlled by the thyristor to reach the voltage across the motor to achieve the control speed. the goal of. The motor speed is unstable. From the principle analysis, the following four situations are possible.
(1) Adjustable resistance, because the adjustable resistor is installed on the control panel, the frequency of use is very high, and the time is long, and the situation of poor contact is common.
(2) There are also many problems with thyristors, usually breakdown short circuit, open circuit, unable to trigger or poor internal contact.
(3) One of the four rectifier diodes has only a problem.
(4) There is toner or a carbon brush between the rotor and the commutator of the motor.
In the principle of repairing the first easy and difficult, first measure the adjustable resistance, the resistance value changes regularly with the adjustment, and prove that the potentiometer is good. No problem was found in measuring the thyristor. When measuring four rectifier diodes, one was found to be good or bad, since the diode is a high current gold sealing tube. One end is screwed to the board and the other end is soldered to the board. When the circuit board was removed, it was found that the positive and negative poles were loose, and then the side was shaken while measuring to confirm that the diode was good or bad. Since the pipe type cannot be seen clearly, the pipe of the same specification is installed, and the power is turned on quickly. It is considered that the newly installed pipe is broken down and the measurement is intact. Measuring the other three diodes is also normal. However, in the comparison measurement, it was found that the positive and negative polarities of the two types of diodes are completely opposite (that is, one end of the upper screw has a positive polarity and a negative polarity). Therefore, we must pay attention to the use of the same type of components, the same specifications of components. When replacing the components of the same specification and the same type, power on the test machine and everything will return to normal.
The above is the emergency maintenance solution for the centrifuge when the speed is unstable. Through the above solutions, the problem can be judged and solved, and the speed of the centrifuge is unstable.
But we sometimes have the following problems in daily use. How do we solve it?
1. Fault phenomenon: It is found that both high speed and low speed are unstable.
Trouble-shooting: The centrifuge is a DC-type speed-regulating motor. The speed of the centrifuge is changed by the adjustable resistance to change the conduction angle of the thyristor and then controlled by the thyristor to reach the voltage across the motor to achieve the control speed. the goal of. The motor speed is unstable. From the principle analysis, the following four situations are possible.
(1) Adjustable resistance, because the adjustable resistor is installed on the control panel, the frequency of use is very high, and the time is long, and the situation of poor contact is common.
(2) There are also many problems with thyristors, usually breakdown short circuit, open circuit, unable to trigger or poor internal contact.
(3) One of the four rectifier diodes has only a problem.
(4) There is toner or a carbon brush between the rotor and the commutator of the motor.
In the principle of repairing the first easy and difficult, first measure the adjustable resistance, the resistance value changes regularly with the adjustment, and prove that the potentiometer is good. No problem was found in measuring the thyristor. When measuring four rectifier diodes, one was found to be good or bad, since the diode is a high current gold sealing tube. One end is screwed to the board and the other end is soldered to the board. When the circuit board was removed, it was found that the positive and negative poles were loose, and then the side was shaken while measuring to confirm that the diode was good or bad. Since the pipe type cannot be seen clearly, the pipe of the same specification is installed, and the power is turned on quickly. It is considered that the newly installed pipe is broken down and the measurement is intact. Measuring the other three diodes is also normal. However, in the comparison measurement, it was found that the positive and negative polarities of the two types of diodes are completely opposite (that is, one end of the upper screw has a positive polarity and a negative polarity). Therefore, we must pay attention to the use of the same type of components, the same specifications of components. When replacing the components of the same specification and the same type, power on the test machine and everything will return to normal.
The above is the emergency maintenance solution for the centrifuge when the speed is unstable. Through the above solutions, the problem can be judged and solved, and the speed of the centrifuge is unstable.
With long range distance sensor with digital output, you can measure and monitor distances intergrated to your arduino, raspberry pi etc. The Laser Distance Sensor low cost is a competitive measure sensor, can measure from 3cm to 40m, 100m, max to 150m with +-1mm~+-3mm accuracy. Also, other requirements can be customized, like distance sensor analog output,long range ir sensor. We will give you full technical support when you testing our long distance sensor.
Long Range Distance Sensors,Long Range Sensor,Long Range Laser Sensor,Laser Ranging Sensor
Chengdu JRT Meter Technology Co., Ltd , https://www.cdtoflidarsensor.com