Laboratory Magnetic Stirrer Series Manufacturer

Shanghai Qiujing Biochemical Reagent & Instrument Co., Ltd. designs, manufactures and exports the Laboratory Magnetic Stirrer Series as part of a laboratory instrument programme that traces back to the Qiujing brand established in 1988. As a Laboratory Magnetic Stirrer Series Manufacturer, we build single-position, four-position and compact bench stirrers, keep heated and unheated variants inside the same control family, and supply laboratories, distributors and OEM partners from our Shanghai factory.

• Sealed-drive stirring: a rotating magnetic field drives a stir bar inside the vessel, so nothing in the drive train touches the sample and vessels can be swapped without dismantling the unit.
• Range logic: one-position work, parallel multi-vessel work and space-limited benches are each covered by a dedicated model family rather than one universal unit.
• Supply model: standard series production, OEM/ODM builds against customer drawings or samples, sample verification before bulk orders, and export packaging for overseas delivery.

Our Laboratory Magnetic Stirrer Range

Every unit in the series is intended for wet-bench mixing of reagents, buffers, media, dilutions and sample preparations, from small volumes in tubes and small beakers to larger vessels on a shared preparation bench. The four model families currently in production are:

• Qiujing Top Magic TOP1 / TOP1H — single channel, heated and unheated. LCD display with adjustable speed and time, giving one vessel at a time fully settable stirring conditions.
• Qiujing Top Magic TOP4 / TOP4H — four channel, heated and unheated. The same LCD speed and time control applied to four positions, so parallel samples can run under matched stirring conditions.
• Qiujing Top Magic Top380 — bench stirrer with DC brushless motor. Built around quiet running for benches where stirring continues for long periods.
• Qiujing Mini Star — compact magnetic stirrer with DC brushless motor. Small footprint for limited bench space, teaching laboratories and mobile or temporary stations.

The series sits inside Laboratory Instruments, our wider bench equipment group that also covers centrifuges, water baths, metal baths, balances, pH meters, photometers and preparation instruments, allowing a laboratory project to be equipped from one manufacturing source.

Range and Model Comparison

Application Fit in Working Laboratories

Magnetic stirring is the default mixing method wherever small volumes must be homogenised without an overhead shaft entering the vessel. Our series supports the workflows below; where a task needs higher torque, vortexing or overhead mixing, our Laboratory Mixer Series covers the complementary duty.

• Chemistry and biology wet labs: dissolving solids, preparing buffers, keeping suspensions uniform during titration and sampling.
• Food and environmental testing: sample pre-treatment and extraction steps where several vessels are stirred simultaneously.
• Pharmaceutical and biotech QC: media preparation and repeatable sample handling where the same speed and time settings are used across runs.
• Universities and teaching laboratories: durable bench units that tolerate frequent operator changes and short, repeated cycles.
• Industrial R&D and quality control: formulation trials and incoming-material checks on production-adjacent benches.

Choosing the Right Format

Format selection follows the number of vessels, the heating requirement and the bench environment rather than the catalogue price level. The TOP1/TOP1H single-channel heated and unheated magnetic stirrer suits sequential work where one sample is prepared at a time and the operator needs to set speed and time precisely.

• One vessel, controlled conditions: TOP1 or TOP1H, depending on whether plate heating is required.
• Four vessels under matched conditions: TOP4 or TOP4H for comparative series, parallel digestion or batch preparation.
• Quiet, continuous duty: Top380 with DC brushless drive for benches where stirring runs alongside other work.
• Minimum footprint: Mini Star for teaching benches, fume hoods and temporary stations where space is the limiting factor.

Vessels, Stir Bars and Stirring Behaviour

Stirring quality depends as much on the vessel and stir bar as on the instrument, so we specify these alongside the model during configuration. Flat-bottom vessels give the closest coupling between the magnetic field, the stir bar and, on heated models, the plate surface.

• Stir bar selection: PTFE-coated bars sized to roughly one third of the vessel diameter for stable rotation without wall contact.
• Vessel material: borosilicate glass and most laboratory plastics transmit the rotating field without shielding; thick bases and metal racks reduce coupling.
• Viscosity: thicker media and particle-loaded suspensions need larger bars and lower speeds to avoid stalling and vortexing.
• Placement: a level, non-ferrous bench surface keeps the magnetic field symmetrical and limits vibration transfer.

Controls, Heating and Bench Workflow

The TOP1/TOP1H and TOP4/TOP4H units use an LCD interface with adjustable speed and time, so an operator can log a setting and repeat it on the next batch. Heated and unheated versions share the same control concept, which simplifies training and spare-part planning when a laboratory operates both types.

• Timer-based steps: fixed stirring periods reduce operator attention on long preparations.
• Heating control: choose the H variant where dissolution or media preparation requires plate heat in addition to agitation; select unheated units where the sample is already temperature-controlled elsewhere.
• Brushless drives: Top380 and Mini Star use DC brushless motors for quiet running and long duty cycles on shared benches.
• Bench grouping: stirrers are commonly placed with balances, pH meters and photometers, so we confirm available width and ventilation at the quotation stage.

OEM/ODM and Configuration Options

We support OEM/ODM projects covering product design, specification adjustment, appearance customisation and packaging solutions, working from customer drawings, samples or application requirements. Samples can be supplied for performance verification, and specifications are finalised after customer confirmation before formal production begins. Standard series production runs on a published 10-working-day lead time, with the schedule reconfirmed once the final configuration, quantity and branding scope are fixed.

Quality Control, Acceptance and Service

Qiujing operates a quality management system certified to ISO 13485, and our products carry CE marking; our certificate set also includes EU medical device notification, medical device export sales and Class I medical device production record documentation. Production is controlled from raw material inspection through in-process testing to finished-product inspection, supported by an in-house test laboratory.

• Acceptance: sample units are verified against the agreed specification before bulk manufacture, and finished units are inspected before packing.
• Installation: bench placement, ventilation clearance, power supply matching for the destination market and operator familiarisation are confirmed with the order.
• Maintenance: wipe the plate surface, keep the drive area free of spilled liquid, inspect PTFE coatings on stir bars and replace worn bars; brushless drives remove brush servicing from the schedule.
• After-sales: product consultation, operation guidance and troubleshooting support are provided for overseas partners.

Information We Use to Configure Your Solution

A proposal is prepared from the working point rather than from a model list. The following inputs let us fix the model, options and packaging in one quotation:

• Vessel and working volume: beaker or flask sizes, number of positions needed, and whether vessels are standardised across the laboratory.
• Sample nature: viscosity, solids content and required final homogeneity, which determine stir bar size and practical speed range.
• Heating: target plate temperature duty, whether heating is required at all, and how the vessel base contacts the plate.
• Control needs: whether speed and time must be set and repeated, and whether one operator or several shifts run the unit.
• Environment: bench width, noise expectation, ambient conditions and available power supply at the installation point.
• Commercial and market inputs: quantity, OEM/ODM branding, packaging language, documentation requirements and delivery destination.

Frequently Asked Questions

Which models make up the Qiujing Laboratory Magnetic Stirrer Series?

Four families: Top Magic TOP1/TOP1H single channel, Top Magic TOP4/TOP4H four channel — both available in heated and unheated versions with LCD speed and time control — plus the Top380 bench stirrer and the compact Mini Star, both using DC brushless motors.

Can we order heated and unheated versions of the same stirrer?

Yes. The TOP1 and TOP4 are the unheated units; the TOP1H and TOP4H add plate heating. Because they share the control concept, laboratories that need both can standardise operation and spares.

When should a four-channel stirrer replace several single-channel units?

The four-channel TOP4/TOP4H is the practical choice when samples must be stirred simultaneously under matched conditions, for example comparative trials, batch preparation or parallel sample pre-treatment.

Do you provide OEM/ODM customisation for magnetic stirrers?

We handle product design, specification adjustment, appearance customisation and packaging solutions based on customer drawings, samples or application requirements, with samples available for verification before bulk production.

What information do you need to issue a quotation?

Vessel types and working volumes, number of stirring positions, viscosity and sample behaviour, heating requirement, control expectations, bench environment and power supply, plus quantity, OEM/ODM scope, documentation and delivery destination.

How are the stirrers maintained after installation?

Routine care is limited to keeping the plate clean and dry, checking that stir bars remain straight and their PTFE coating intact, and leaving adequate ventilation clearance. Brushless models avoid brush replacement, and our after-sales team supports operation questions and troubleshooting.