New four-head single-control magnetic stirrer EMS-4A
Ultra-thin appearance, can stir four samples at the same time, with equal stirring time and speed, suitable for parallel experiments. Speed: 0~2000rpm Stirring capacity: (10-2000ml) process and fault phenomena. For unfamiliar equipment, you should first familiarize yourself with the circuit principles and structural features and abide by the corresponding rules. Before disassembly, you must be fully familiar with the function, location, connection method and relationship with other surrounding devices of each electrical component. If there is no assembly diagram, you should draw a sketch and mark it while disassembling.
2. Check the outside first, then the inside: Check the equipment first for obvious cracks and defects, learn about its maintenance history, service life, etc., and then check the inside of the machine. Before disassembly, peripheral fault factors should be eliminated, and disassembly can only be done after it is determined to be an internal fault. Otherwise, blind disassembly may make the equipment worse as it is repaired.
3. Mechanical and post-electrical: Only after confirming that the mechanical parts are fault-free, conduct electrical inspections. When checking for circuit faults, you should use testing instruments to find the fault location. After confirming that there is no bad contact fault, you can then check the operating relationship between the circuit and the machine in a targeted manner to avoid misjudgment.
4. First static and then dynamic: when the equipment is not powered on, judge the quality of the electrical equipment buttons, transformers, thermal relays and fuses to determine the location of the fault. Power on the test, listen to the sound, measure parameters, determine the fault, and finally perform repairs. For example, when the motor is missing a phase, if the three-phase voltage value cannot be determined, you should listen to the sound and measure the voltage of each phase individually to determine which phase is missing.
5. Clean first and then repair: For electrical equipment with heavy pollution, clean the buttons, wiring points, and contact points first, and check whether the external control keys are malfunctioning. Many failures are caused by dirt and conductive dust particles.
6. Power supply first, equipment second: The failure rate of the power supply part accounts for a high proportion of the entire faulty equipment, so repairing the power supply first can often get twice the result with half the effort.
7. Debug first and then debug: For electrical equipment where debugging and fault coexist, the fault should be eliminated first and then debugged. Debugging must be carried out under the premise of ensuring the speed of the electrical line.
8. Common first, then special: Failures caused by the quality of assembly parts or other equipment failures generally account for about 50% of common failures. Special faults of electrical equipment are mostly soft faults, which require experience and instrumentation to measure and repair.
When the electric mixer is damaged during the experiment, we must not be anxious, but should respond calmly. We should deal with it through the 8 points we explained above. First determine the cause of the failure, and then prescribe the right medicine, which will definitely get twice the result with half the effort. In addition, We should also pay attention to the maintenance of electric mixers in daily use to extend the service life of the equipment as much as possible.