Submersible Magnetic Stirrer

What is the Submersible Magnetic Stirrer?

A submersible magnetic stirrer is a sealed, waterproof stirring base designed to operate inside incubators, cold rooms, water baths and humid chambers. It is the right choice for continuous gentle stirring of cultures, dissolution baths and samples at controlled temperature.

Overview

Submersible stirrers place the motor and magnet assembly in a fully sealed housing, usually rated IP67 or higher, with a cable outlet that resists moisture. They can be immersed in a water bath or placed in a high-humidity CO2 incubator without corrosion or electrical hazard. Since heat inside an incubator is a concern, these units use low-power brushless motors that dissipate only a few watts. Speeds usually range from 15 or 50 rpm up to about 1,500 rpm, which covers the gentle mixing needed for mammalian cell suspension cultures and spinner flasks. Multi-position versions with two to six heads in one controller are common. Housings are constructed from chemically resistant polymers or stainless steel to survive cleaning and decontamination.

How does it work?

A magnetic stirrer contains a motor-driven permanent magnet, or a set of electromagnets, beneath a flat work surface. As the magnetic field rotates, it couples to a PTFE- or glass-coated stir bar placed in the vessel and pulls the bar into synchronous rotation, which creates a vortex and mixes the liquid. Speed is set by varying motor voltage or by pulse-width modulation, and digital models add a tachometer feedback loop to hold rpm constant. If the load or viscosity is too high, the bar decouples from the field and spins erratically. Bar shape, length and surface finish influence mixing efficiency, and larger bars couple better at high volumes. The work surface may be aluminum, stainless steel or glass-ceramic, chosen for chemical resistance and cleanability.

What are the key features?

• Sealed housing rated IP67 or higher for immersion and humidity
• Low-power brushless motor limits heat in CO2 incubators
• Low minimum speed suitable for gentle suspension cell culture
• Remote controller keeps electronics outside the incubator
• Stainless steel or polymer housing tolerates disinfectants
• Multi-head versions run two to six positions from one controller

What are the technical specifications?

A typical submersible magnetic stirrer configuration offers speed range of 15–1,500 rpm, ingress protection of IP67, max stirring volume (water) of 2–5 L per position, number of positions of 1–6, ambient temperature range of 0–60 °C and humidity tolerance of Up to 100 % RH, condensing. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Submersible Magnetic Stirrer is used in suspension cell culture in CO2 incubators, spinner flask agitation, stirring in water baths, cold room sample mixing and long-duration dissolution studies. Across the wider Magnetic Stirrers class, laboratories also deploy it for buffer and reagent preparation, titration sample mixing and cell culture media preparation.

Which standards and certifications apply?

Relevant standards and methods include IEC 61010-1, IEC 61010-2-010, IEC 61326-1, GB 4793.1 and ISO 9001. Certification candidates for this model are CE, RoHS and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Place the stirrer on a level, vibration-free surface and keep liquids away from the vents. Start at low speed and increase gradually so the bar does not decouple and strike the vessel wall. Clean PTFE bars and plates after use, and inspect bars for chips or contamination that might carry over between runs. Magnetic fields can affect pacemakers, magnetic media and sensitive electronics, so set safe distances. Periodically verify rpm with a tachometer and record the result in the equipment log. For regulated work, include the unit in the preventive maintenance and qualification program, and check that electrical safety testing complies with IEC 61010-1 and your local requirements.

How do I select the right Submersible Magnetic Stirrer?

Select a submersible stirrer when the device must live in moisture, cold or a CO2 incubator and heat output must be minimal. Compare it with slim-profile units, which are not always fully sealed. Specify positions, minimum speed, IP rating, chemical exposure such as disinfectants, and cable length to the controller.

How does it compare with other Magnetic Stirrers variants?

Decide first on maximum liquid volume and viscosity, because these set the magnet strength and the largest bar that will stay coupled. Then choose between analog control, which is economical and adequate for routine mixing, and digital control with a rpm display and closed-loop regulation, which is preferred when repeatability matters. A slim profile helps where space is tight or when stirring inside hoods, while a submersible format suits incubators and cold rooms. Check speed range, particularly the low end for gentle mixing of cell cultures, plus the working surface material, IP rating of the housing and ambient temperature limits. For sensitive samples, verify that the motor does not transmit significant heat to the vessel. Specify voltage, plug type and any required explosion-protection features in your RFQ.