The safety protection device of the constant temperature cultivation shaker (used in laboratory for microbial culture, cell culture and other scenarios, with the core of "constant temperature+oscillation" coordination) is designed around the three core aspects of "personnel safety, sample safety, and equipment safety", covering key risk points such as temperature, oscillation, electrical, mechanical, etc. It can be classified according to protection dimensions, taking into account both professionalism and practicality:
1、 Temperature safety protection (to avoid the risk of sample damage or overheating)
Overtemperature alarm and power-off protection:
Core protection function: When the temperature inside the box exceeds the set range (such as 37 ℃ with a deviation of ± 2 ℃) or reaches the maximum safe temperature (usually 50-60 ℃, customizable), the instrument will automatically sound and light an alarm, and cut off the heating power supply (some models retain the cooling function to avoid sudden temperature rise), to prevent sample denaturation due to overheating (such as cell death, microbial inactivation) or fire.
Temperature sensor fault protection:
If the temperature sensor (such as PT100) is open, short circuited, or has poor contact, the instrument will display an "abnormal temperature" alarm and stop heating/cooling to avoid temperature loss due to sensor failure (such as continuous heating to high temperatures).
Anti dry burn protection (water jacket model):
The heating element of the water jacket constant temperature cultivation shaker needs to be immersed in water. If the water level in the tank is too low (without passing through the heating tube), it will trigger dry burn protection, automatically cut off the heating power supply, and sound an alarm to prevent the heating tube from burning out or the water tank from overheating and cracking.
Overload protection for refrigeration system:
If the pressure of the refrigeration compressor is too high (such as pipeline blockage, poor heat dissipation) or overloaded during operation, it will automatically shut down and sound an alarm to avoid compressor burnout and prevent abnormal temperature fluctuations inside the box from affecting the sample.
2、 Vibration and mechanical safety protection (to avoid mechanical failure or sample leakage)
Overspeed alarm and shutdown protection:
When the oscillation speed exceeds the set upper limit (such as the conventional model speed range of 50-300rpm, the overspeed threshold is usually 110% of the set value) or the speed is out of control, the instrument immediately stops oscillating and alarms to prevent sample centrifugal overflow (such as culture medium spillage), shaking bottle rupture, or mechanical structure overload damage caused by excessive speed.
Door cover safety lock and linkage protection:
This is the core mechanical protection device - when the door cover is not closed or not tightly closed, the instrument cannot start oscillating (some models also cut off the heating power supply); If the door cover is opened during operation, the oscillation will immediately stop (heating may be kept at a constant temperature to avoid sudden temperature drops), to prevent the operator's hands from being hit by the oscillating shaking bottle, or to prevent temperature fluctuations and contamination of the sample due to the opening of the door cover.
Unbalance protection (eccentricity protection):
If the sample volume in the shaking bottle is uneven or the shaking bottle is placed asymmetrically, causing the center of gravity to shift (eccentric overload) during oscillation, the instrument will detect abnormal vibration, automatically reduce the speed or stop the machine and give an alarm to avoid severe shaking, displacement, or even mechanical shaft fracture caused by imbalance.
Overload protection for shaker:
When the weight carried by the oscillating tray exceeds the rated load (such as 20-50kg for conventional models), or when the mechanical transmission system (such as motors, belts) is overloaded, overload protection will be triggered, the oscillating power supply will be cut off, and an alarm will be triggered to prevent motor burnout or transmission component wear.
3、 Electrical safety protection (avoiding risks of electric shock, short circuit, or fire)
Leakage protection:
The instrument is equipped with a leakage protection switch. If electrical components (such as motors, heating tubes, controllers) are affected by moisture or insulation damage, causing leakage (leakage current ≥ 30mA), the main power supply will be immediately cut off to prevent operators from getting electric shock.
Overcurrent/Short Circuit Protection:
The power board is equipped with fuses and overcurrent protection circuits. In the event of power cord damage or electrical component short circuit (such as motor short circuit), the fuses will melt, and the overcurrent protection will trigger a power outage to avoid fire or damage to the motherboard.
Grounding protection:
The instrument casing is connected to the ground through a grounding wire (grounding resistance ≤ 4 Ω). If there is leakage in the internal electrical components, the current will be introduced into the ground through the grounding wire to prevent the casing from being charged and ensure the safety of operators when touching.
Voltage abnormality protection:
When the input voltage exceeds the rated range of the instrument (such as AC220V ± 10%), the instrument will automatically power off or alarm to prevent damage to core components such as motors and controllers due to high/low voltage, and to avoid unstable oscillation speed or temperature caused by voltage fluctuations.