Proper operation of portable centrifuges should prioritize safety, as safety is a fundamental requirement for enterprise production.

　　 Handheld centrifuge Also known as a mini centrifuge, its defining feature is its small size. Generally speaking, smaller products tend to exude a sense of refinement—and the handheld centrifuge is no exception. As a high-tech product, it reflects meticulous attention to detail in both quality and design. So today, rather than dwelling on quality issues, let’s focus on safe operating procedures. After all, even the best product goes to waste if it’s used carelessly!

　　The operating principle of a handheld centrifuge is essentially the same: it uses centrifugal force to fling the mixed liquid against the wall of the rotor. The liquid flows out through small holes in the rotor wall and via an internal filter screen, while the solids—being larger particles—are retained by the filter screen. As the centrifugation time increases, more and more solids accumulate inside the rotor, trapped by the filter screen. Once the desired level of solid accumulation is reached, the machine is stopped, the solids are removed for observation, and if liquid is also required, the liquid is recovered and further processed.

　　The handheld centrifuge operates based on the difference in specific gravity between solid-liquid (or liquid-liquid) phases. The material with higher specific gravity first settles against the inner wall of the rotor drum, while the lighter material forms a liquid ring on the inner side. Once the separation requirements are met, a specialized skimming device is used to extract the inner-layer liquid, or, by continuously adding feed material, the liquid naturally overflows through the upper baffle plate, thereby completing one working cycle.

　　The operation is simple and convenient—just place the microcentrifuge tubes in position, close the lid, and start the machine. The rotor quickly reaches its maximum speed, and the centrifugal force is evenly and rapidly applied to both the tube caps and tube walls. This makes it particularly well-suited for handling PCR tubes and microfiltration applications, enabling rapid removal of reagents from the tube walls or tube caps, as well as for slow-speed centrifugation of individual tubes or tube racks. The pocket-sized centrifuge is one of the most commonly used laboratory instruments. So, how should we control its vibration range during use? As we all know, the rotor can only rotate smoothly if the centrifuge’s operating speed does not coincide with its critical speed. For low-speed centrifuges with relatively low operating speeds, manufacturers generally aim to maximize the critical speed so that the centrifuge operates below this critical value. Such centrifuges feature a thick, highly rigid shaft known as a rigid shaft. However, when higher rotational speeds are required, the critical speed must be minimized as much as possible, resulting in a thinner shaft with lower rigidity—a design known as a flexible shaft. Modern ultracentrifuges typically employ flexible shafts.

　　Precautions:

　　1. Operating the instrument without turning the head is prohibited;

　　2. Do not add samples into centrifuge tubes installed in the rotor, to avoid corrosion of the rotor and other components.

　　3. Do not move the instrument during centrifugation.

　　4.4. The machine should be placed on a level and sturdy work platform.

　　Handheld centrifuges are primarily used in medical laboratories, hospitals, pharmaceutical companies, biological research institutes, and fine chemical industries. Once the rotor vibration exceeds a certain threshold upon startup, the centrifuge automatically slows down and shuts down. Centrifuges with this feature may occasionally fail to trigger an alarm, thus failing to completely prevent accidents. Humidity sensor probes, stainless steel electric heating tubes, PT100 sensors, cast-aluminum heaters, and fluid solenoid valves for heating coils.

　　Once vibration occurs at high rotational speed, immediately press the stop button to bring the benchtop centrifuge to a rapid stop using the quick-deceleration mode. All personnel should promptly evacuate the area to avoid injury in case of accidents such as rotor breakage. Under no circumstances should you disconnect the power supply—once the power is cut, the braking mechanism (which provides rapid deceleration) will fail, and the rotor will come to a halt very slowly. Such accidents are typically caused by improper operation of the centrifuge—for example, if the rotor is not properly seated on the spindle, the rotor lid is not securely closed, or the basket for swinging rotors is not positioned correctly. These accidents are usually accompanied by a loud noise. Upon opening the lid, you’ll find the rotor lying inside the chamber; removing the rotor reveals severe scratches and discoloration on its outer surface. The inner walls of the centrifuge chamber may also be damaged, and in some cases, refrigerant leakage could occur. Occasionally, the rotor and rotor lid become separated, causing liquid from the tubes to spill into the chamber, and the spindle may either break off or bend severely.

　　Therefore, operational standards are the top priority—after all, safe production is the number-one requirement for any enterprise!