7″ Square Magnetic Stirrer (MS7‑S)

1. BASIC IDENTIFICATION ATTRIBUTES

• Device Type: A non‑heating, analog‑controlled magnetic stirrer with a square glass ceramic work plate.

• Designation: MS7‑S 7″ Square Magnetic Stirrer, DLAB MS7‑S, Standard 7‑Inch Square Plate Magnetic Stirrer, Product No. 8030122000.

• Key Components:

  • 7‑inch (184×184 mm) square glass ceramic work plate with exceptional chemical resistance

  • Shaded‑pole drive motor (15 W input, 1.5 W output)

  • Rotary control knob for stepless speed adjustment from 0 to 1500 rpm

  • Graduated scale indicator for reproducible speed setting

  • Universal power supply (100–240 V, 50/60 Hz)

  • IP21‑rated metal housing with powder‑coated finish

  • Non‑slip rubber feet for stability during operation

  • PTFE‑coated magnetic stirring bar (50 mm length, included)

2. TECHNICAL & PERFORMANCE PROPERTIES

• Work plate dimensions: 184×184 mm (7 inches square) – provides a large, flat area for accommodating wide‑bottom beakers, crystallization dishes, microplate trays, and multiple vessels simultaneously, offering stability and preventing drifting.

• Work plate material: Glass ceramic – high‑strength, chemically inert surface resistant to strong acids, strong alkalis, and organic solvents; smooth, non‑porous finish for easy cleaning and decontamination.

• Motor type: Shaded‑pole AC motor (15 W input, 1.5 W output) – robust, maintenance‑free design offering quiet, vibration‑free operation and long service life for everyday laboratory use.

• Maximum stirring capacity (H₂O): 10 liters – suitable for preparing large volumes of buffers, diluents, media, and QC materials in a single batch.

• Speed range: 0 to 1500 rpm, stepless analog control via rotary knob – allows infinite speed adjustment from gentle mixing for cell suspensions to vigorous stirring for dissolving crystalline powders.

• Speed display: Graduated scale – the large, clearly printed scale allows the user to mark and reproduce preferred stirring speeds without a digital readout.

• Maximum magnetic bar length: 80 mm – delivers powerful magnetic coupling, especially when using larger bars for viscous mixtures or large volumes.

• Power consumption: 30 W – energy‑efficient design suitable for continuous daily operation with low electricity costs.

• Voltage/Frequency: 100–120 V / 200–240 V, 50/60 Hz (universal input) – direct operation in laboratories worldwide without an external voltage converter.

• Protection class: IP21 (per DIN EN 60529) – protects against ingress of solid foreign objects larger than 12.5 mm and protection against vertically falling water drops, ensuring safe operation in standard benchtop environments.

• Dimensions (W × D × H): 215 × 360 × 112 mm – compact benchtop footprint compatible with standard fume hoods and lab benches.

• Weight: 3.8 kg – heavy, stable construction that resists vibration and reduces the risk of tipping during high‑speed stirring.

• Operating conditions: 5–40 °C, ≤80 % relative humidity – reliable performance in typical clinical and research laboratory conditions.

• Certifications: TÜV‑certified (CE, cTUVus, FCC) – meets internationally accepted safety and protection standards, including DIN/EN 60529 for ingress protection and electrical safety in laboratory environments.

3. PHYSICAL & OPERATIONAL PROPERTIES

• Expert input reference – Guide for writing applications: This MS7‑S is a mechanically simple, non‑heating stirrer. To design a clinical microbiology use case, think: The technician uses the glass ceramic plate because it is easy to clean after media spills. The chemical‑resistant surface tolerates acidic or alkaline solutions without damage. The 0–1500 rpm range covers both powder dissolution (high rpm) and gentle mixing (low rpm). The shaded‑pole motor is spark‑free, which is advantageous for labs handling low levels of flammable solvents.

• Construction: Heavy‑duty benchtop design with a powder‑coated aluminum‑alloy base and corrosion‑resistant metal housing. The glass ceramic work plate offers high durability and excellent chemical resistance for long‑term use in clinical, analytical, and research environments.

• Work plate: 7‑inch (184×184 mm) square glass ceramic plate – the large, flat, non‑porous surface provides exceptional chemical resistance against strong acids, strong alkalis, and organic solvents. The smooth finish makes it easy to clean after spills and resists staining, while the broad dimensions offer stability even for wide‑bottom beakers typically used for 5–10 L preparations.

• Operation: Simple, intuitive analog operation with a single rotary control knob for stepless speed adjustment from 0 to 1500 rpm. Speed selection is indicated on a clear graduated scale, allowing users to reproduce desired stirring speeds without the need for digital settings.

• Motor technology: Shaded‑pole AC motor (15 W input, 1.5 W output) – robust, reliable, and maintenance‑free design that operates quietly with minimal vibration. The motor provides consistent torque across the entire speed range and is suitable for continuous long‑term use.

• Safety features: IP21‑rated metal housing provides protection against solid foreign objects larger than 12.5 mm and vertically falling water drops. The powder‑coated finish resists chemical attack, and the non‑slip rubber feet ensure the stirrer remains stable during operation at high speeds.

• Universal power supply: Built‑in wide‑range power supply accepts 100–240 V, 50/60 Hz, allowing the MS7‑S to be used in laboratories globally without external voltage converters or adapters.

• Stirring system: The variable magnetic field generated by the AC motor drives PTFE‑coated stirring bars of any type up to 80 mm in length. The strong magnetic coupling ensures the stir bar remains engaged even at high speeds or when stirring viscous solutions.

• Maintenance: Virtually maintenance‑free design. The glass ceramic work plate requires only routine cleaning with a mild detergent and soft cloth. No lubrication or moving‑part servicing is required for the shaded‑pole motor.

• Portability: Compact benchtop dimensions (215 × 360 × 112 mm) and lightweight (3.8 kg) construction allow the instrument to be easily moved between workstations or stored when not in use.

• Spill containment: The raised edges of the glass ceramic plate help contain minor spills, preventing liquids from running onto the benchtop or into the instrument housing, and the IP21 rating protects internal components from splashes.

4. SAFETY & COMPLIANCE ATTRIBUTES

• Regulatory Status: General laboratory equipment for in vitro diagnostic (IVD) use. Manufactured under ISO 9001 and ISO 13485 quality management systems. TÜV‑certified to international safety standards (CE, cTUVus, FCC) in accordance with DIN/EN 60529.

• Chemical Safety: The glass ceramic work plate is resistant to strong acids, strong alkalis, and organic solvents used in clinical and research laboratories. The smooth, non‑porous surface withstands prolonged exposure to aggressive reagents without corrosion, staining, or loss of integrity, and resists scratching from routine cleaning.

• Electrical Safety: Designed and tested in accordance with IEC/EN 61010‑1 safety standards for laboratory electrical equipment. The brushless shaded‑pole AC motor operates without sparks, reducing ignition risk when working with trace amounts of volatile or flammable solvents on the bench. The universal power input (100–240 V, 50/60 Hz) includes internal overload protection.

• Ingress Protection (IP21): Rated IP21 per DIN EN 60529, the housing protects against solid foreign objects larger than 12.5 mm and against vertically falling water drops (basic splash protection), ensuring safe operation in typical laboratory environments and resistance to minor spills.

• Mechanical Safety: The 3.8 kg weight of the unit, combined with non‑slip rubber feet, provides excellent stability to prevent vibration‑induced walking or tipping during high‑speed stirring, even when working with larger 5–10 L vessels.

• Operational Safety: The glass ceramic work plate remains at ambient temperature during operation (non‑heating design), eliminating burn hazards associated with hotplate stirrers. The large, flat plate prevents vessels from rocking or sliding.

5. STORAGE & HANDLING ATTRIBUTES

• Storage: Store in a clean, dry, dust‑free environment at room temperature (15–30 °C) when not in use. The IP21 rating allows safe storage in general laboratory cabinets and drawers. Stacking of multiple units or heavy objects on top of the stirrer is not recommended.

• Installation: Place the MS7‑S on a stable, level, non‑flammable benchtop away from strong magnetic fields (e.g., large permanent magnets, NMR equipment) that could interfere with the magnetic coupling. Allow at least 5 cm clearance on all sides for ventilation. The universal power supply (100–240 V, 50/60 Hz) connects directly to standard laboratory wall outlets without voltage conversion.

• Cleaning: Unplug the unit before cleaning. Allow the work plate to cool if the unit has been in use (the plate remains at room temperature during normal operation). Wipe the glass ceramic work plate and the powder‑coated metal housing with a soft, damp cloth or sponge using a mild laboratory detergent or 70 % isopropyl alcohol. For stubborn chemical residues, use a non‑abrasive glass ceramic cleaner and a soft plastic scraper. Do not immerse the unit in liquid. Do not use abrasive cleaners, metal scouring pads, or sharp objects that may scratch the glass ceramic surface.

• Pre‑use inspection: Before each use, inspect the power cord and plug for damage. Ensure the work plate is clean, dry, and free of chemical residues. Verify that the stir bar is in good condition without chips, cracks, or signs of wear. Check that the non‑slip rubber feet are intact and the instrument is stable on the benchtop.

• Stirring bar selection and handling: Use only PTFE‑coated or glass‑encapsulated magnetic stirring bars. For the MS7‑S with a maximum stirring capacity of 10 L, stir bars up to 80 mm in length provide optimal magnetic coupling. Select a stir bar size proportional to the vessel size (e.g., 30–40 mm for 1 L beakers, 60–80 mm for 5–10 L vessels). Replace worn or chipped stir bars promptly to prevent scratching of the glass ceramic work plate.

• Vessel selection and placement: Use only flat‑bottomed laboratory vessels (beakers, Erlenmeyer flasks, graduated cylinders) to ensure stability on the flat glass ceramic plate. Center the vessel on the work plate directly above the magnetic drive mechanism for optimal coupling. Ensure the vessel is not cracked, chipped, or otherwise damaged before use.

• Operation and speed setting: Place the stirring bar into the vessel, then center the vessel on the work plate. Turn the speed control knob gradually from “0” to the desired speed, starting low (100–300 rpm) to allow the stir bar to couple properly before increasing to the target speed (up to 1500 rpm). The graduated scale provides a visual reference to reproduce previously optimized settings. The high maximum stirring speed (1500 rpm) is suitable for dissolving solids, mixing viscous solutions, and preparing suspensions, but must be carefully controlled to prevent splashing of low‑viscosity liquids.

• Cooling down regulation: Not required (non‑heating model). The work plate remains at room temperature during normal use.

• Periodic verification: No routine calibration is required for the non‑heating MS7‑S stirrer. Periodically verify that the speed control knob rotates smoothly and that the stir bar couples correctly across the full speed range.

6. LABORATORY & CLINICAL APPLICATIONS

• Primary Application: General‑purpose mixing of liquids for clinical diagnostics (reagent preparation, immunoassay buffer mixing), pharmaceutical quality control (dissolution media, standard solutions), water quality and environmental monitoring (sample homogenization), microbiology (culture media preparation), and general research laboratories where an affordable, large‑capacity, chemically resistant, non‑heating magnetic stirrer is required.

• Clinical Role: A versatile and essential benchtop instrument for hospital and clinical laboratories, clinical chemistry departments, immunology and serology labs, diagnostic microbiology laboratories, and research institutions. Critical for routine reagent preparation, dissolving and mixing buffers and diluents used in automated analyzers, QC standard preparation, and any laboratory workflow requiring consistent, reproducible stirring.