Magnetic Hotplate Stirrer (DMS4-550)

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The Magnetic Hotplate Stirrer (DMS4-550) is a high-performance, programmable benchtop instrument engineered for reliable, precise, and safe simultaneous heating and stirring in clinical diagnostics, pharmaceutical quality control, analytical chemistry, trace element analysis, and life science research. Combining a maximum stirring capacity of 10 liters with a powerful heating capability up to 550°C on a 4-inch (100×100 mm) glass ceramic work plate, the DMS4-550 is the ideal choice for demanding laboratory applications including sample digestion with strong acids, culture media preparation, protein denaturation, and chemical synthesis.

Every Magnetic Hotplate Stirrer (DMS4-550) is equipped with a high-resolution LCD display that simultaneously shows the set and actual values for both temperature and speed, a maintenance-free spark-free brushless DC motor, and a PID temperature controller for stable, precise heating. The glass ceramic work plate provides exceptional chemical resistance against strong acids and strong alkalis, ensuring long-term durability even with aggressive reagents such as concentrated nitric acid for trace metal digestion. With an integrated PT1000 external temperature sensor port (±0.2°C accuracy), users can accurately control sample temperature, making it suitable for temperature-sensitive assays and enzyme kinetics.

Key user-focused features include three selectable heating modes—fast heating, standard heating, and stable heating—allowing users to choose the optimal thermal profile for their specific application. The programmable timer, ranging from 1 minute to 99 hours 59 minutes, enables unattended operation with automatic shutdown and audible alert. Safety is paramount with dual independent safety circuits providing redundant over-temperature protection, an independent residual heat warning (“HOT” indicator lights up at >50°C and stays on even after the unit is turned off), a safety lock to prevent accidental setting changes, and an RS232 data interface for remote PC control and data logging. The corrosion-resistant full-metal housing with waterproof edge design provides heat dissipation, fire protection, and spill containment.

For the clinical laboratory scientist, trace element analysis technologist, and pharmaceutical quality control analyst, the Magnetic Hotplate Stirrer (DMS4-550) delivers the programmable, precise, and safe heating and stirring required for clinical chemistry sample digestion, trace metal analysis sample preparation (blood lead, urine cadmium), culture media preparation, enzyme activity assays, and drug dissolution testing. For the patient, the reliable performance of this instrument ensures that diagnostic tests for heavy metal toxicity, nutritional deficiencies, infectious diseases, and pharmaceutical products are accurate and reproducible, directly supporting effective clinical decision-making, appropriate treatment selection, and patient safety.

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Description

Magnetic Hotplate Stirrer (DMS4-550)

PRIMARY CLINICAL & DIAGNOSTIC USES

1. High-Precision Heating and Stirring for Clinical Sample Preparation
Primary Use: Provides a programmable, LCD digital magnetic hotplate stirrer with a 4-inch glass ceramic work plate and a maintenance-free brushless DC motor, used for the simultaneous heating and mixing of clinical samples, reagents, and biological specimens, with a maximum stirring capacity of 10 liters, a speed range of 100 to 1500 rpm (1 rpm increments), and a heating temperature range from room temperature up to 550°C.

How it helps: For the clinical laboratory scientist and medical technologist, the Magnetic Hotplate Stirrer (DMS4-550) PID temperature control technology and high-resolution LCD display showing set and actual values for both speed and temperature ensure consistent thermal conditions for sample digestion, protein denaturation, and reagent preparation. The glass ceramic work plate provides excellent chemical resistance against strong acids and alkalis and withstands high temperatures up to 550°C. The PT1000 external temperature sensor port (sensor optional) enables precise sample temperature control with ±0.2°C accuracy. For the patient, precise heating and consistent mixing ensure that downstream diagnostic test results are accurate and reproducible, directly supporting reliable clinical decision-making.

2. Sample Digestion and Processing for Trace Element Analysis
Primary Use: Enables precise sample heating and stirring for digestion of clinical specimens including blood, urine, and tissue homogenates with strong acids and oxidizing agents, used for trace element analysis workflows such as atomic absorption spectroscopy (AAS) and inductively coupled plasma mass spectrometry (ICP-MS).

How it helps: For the trace element analysis technologist, the Magnetic Hotplate Stirrer (DMS4-550) 550°C maximum temperature capability and digital control with 1°C increments allow users to set and maintain the specific acidic reaction temperature required for complete digestion. The chemical-resistant glass ceramic plate ensures durability when exposed to harsh digestion reagents, and the stirring function ensures homogeneous digestion throughout the sample. For the patient, accurate digestion is a critical step in quantifying essential elements or identifying heavy metal toxicity, supporting correct diagnosis and treatment of conditions such as lead poisoning, copper deficiency, or Wilson’s disease.

3. Preparation of Culture Media in Clinical Microbiology
Primary Use: Enables the safe heating and melting of solid or solidified culture media, nutrient broths, and agars in glassware suitable for clinical microbiology workflows, including the preparation of culture plates, slants, and broth tubes for pathogen isolation, while simultaneously stirring to ensure a homogeneous solution.

How it helps: For the clinical microbiology technologist, the Magnetic Hotplate Stirrer (DMS4-550) uniform heating up to 550°C, coupled with an adjustable stirring function, allows the even suspension of ingredients without localized overheating that could degrade heat-sensitive media components. The programmable timer from 1 minute to 99 hours 59 minutes automatically stops heating when the countdown finishes, preventing accidental sample damage. For the patient, properly prepared culture media support the accurate identification of bacterial and fungal pathogens from clinical specimens, enabling appropriate antimicrobial therapy selection and improved treatment outcomes.

4. Exact Temperature Control for Sensitive Immunoassay and Enzyme Assays
Primary Use: Enables precise external sample temperature control by connecting an optional PT1000 external temperature sensor (±0.2°C accuracy), used for sensitive clinical assays such as enzyme activity determinations, protein denaturation studies, antigen-antibody incubation for ELISA, and other temperature-critical diagnostic procedures.

How it helps: For the clinical immunology and biochemistry technologist, the PT1000 external sensor allows the instrument to regulate the actual temperature of the sample liquid rather than just the work plate, ensuring exact thermal conditions are maintained throughout the experiment. The three selectable heating modes—fast heating, standard heating, and stable heating—allow users to choose the optimal thermal profile for their specific application. For the patient, precise sample temperature control ensures that diagnostic test results for conditions requiring thermal stability, such as autoimmune disease markers or cardiac enzyme panels, are accurate and reproducible.

SECONDARY & SUPPORTIVE USES

1. General solution preparation for pharmaceutical and food analysis: Used for the efficient dissolution of solids and preparation of standard solutions, buffers, and mobile phases in pharmaceutical and food analysis quality control laboratories, ensuring homogeneity for high-performance liquid chromatography (HPLC) and other analytical testing, with the ability to heat up to 550°C for difficult-to-dissolve compounds.

2. Unattended operation via programmable timer: Features a programmable timer ranging from 1 minute to 99 hours 59 minutes, allowing for unattended operation with automatic shutdown upon completion and an audible buzzer alert, preventing over-heating or over-mixing and saving valuable laboratory time.

3. Safe operation with safety lock and residual heat warning: Includes a safety lock function that prevents accidental changes to operating status once parameters are set, and a “HOT” warning indicator that lights up when the work plate temperature is above 50°C (even after the unit is turned off), protecting users from burn hazards.

4. PC remote control and data logging via RS232 interface: Equipped with RS232 data interface for remote PC control, enabling users to operate the hotplate stirrer from within a fume hood or to integrate it into automated laboratory workflows, with the ability to log temperature and speed data for quality assurance records.

5. Heavy metal and trace element analysis sample digestion: Prepares liquid and digested samples for heavy metal analysis using atomic absorption spectroscopy or inductively coupled plasma mass spectrometry by heating samples in strong acids (e.g., nitric acid, aqua regia) with constant stirring to ensure complete digestion, with glass ceramic plate resistant to aggressive acids.

6. Biological oxygen demand (BOD) and chemical oxygen demand (COD) water testing: Prepares samples and reagents for essential water quality tests by ensuring the complete dissolution and uniform mixing of the strong oxidizing agents and other chemicals used in oxygen demand analysis, with consistent heating and stirring for reproducible results.

7. Protein purification and refolding: Provides controlled temperature (up to 550°C) and gentle mixing for protein purification (e.g., column chromatography) and protein refolding experiments in biochemistry and molecular biology laboratories, with PT1000 external sensor for precise sample temperature control.

8. Dissolution testing for pharmaceutical quality control: Used in pharmaceutical quality control laboratories to heat dissolution media to specified temperatures (e.g., 37°C ± 0.5°C) and maintain constant stirring for dissolution testing of solid dosage forms (tablets, capsules), supporting drug development and regulatory compliance.

9. Chemical synthesis and parallel reactions: Provides stable, reproducible heating and stirring for small-scale chemical synthesis and parallel reaction workflows in organic chemistry and pharmaceutical research, with fast thermal response and compatibility with various heating containers and reaction blocks, capable of reaching 550°C for high-temperature reactions.

10. Material thermal stability assessment: Heats small material samples to assess thermal stability, melting points, or heat-induced property changes in quality control and research laboratories for polymers, pharmaceuticals, and other materials, with uniform plate heating and digital temperature display for precise monitoring.

11. General and educational laboratory use: Serves as a versatile, user-friendly teaching tool for demonstrating the principles of solution preparation, chemical reaction kinetics, and the effect of heat on chemical systems in university chemistry and biology laboratory courses, with an intuitive LCD interface and safety features suitable for student use.

KEY PRODUCT FEATURES

1. BASIC IDENTIFICATION ATTRIBUTES

Device Type: A programmable, LCD digital heating magnetic stirrer with a 4-inch glass ceramic work plate and a brushless DC motor.
Designation: Magnetic Hotplate Stirrer (DMS4-550), MS4-H550-Pro, DLAB DMS4-550, 4-Inch Hotplate Magnetic Stirrer.
Key Components:
- 4-inch (100×100 mm) glass ceramic work plate (strong acid resistant, strong alkali resistant, high temperature resistant)
- Maintenance-free, spark-free brushless DC motor
- High-resolution LCD display showing set and actual values for both speed and temperature simultaneously
- PID temperature controller for stable, precise heating processes
- PT1000 external temperature sensor port for precise sample temperature control (±0.2°C accuracy)
- Three selectable heating modes: fast heating, standard heating, and stable heating
- Programmable timer (1 minute to 99 hours 59 minutes)
- RS232 data interface for remote PC control and data transmission
- Built-in "HOT" safety indicator (lights up when plate temperature >50°C, even after unit is off)
- Safety lock to prevent accidental changes to operating status
- Dual independent safety circuits with over-temperature protection (shuts off heating at 550°C+ safety margin)
- Corrosion-resistant full-metal housing with heat dissipation and fire protection
- High-efficiency infusion platform and waterproof edge design

2. TECHNICAL & PERFORMANCE PROPERTIES

Work plate material: Glass ceramic (strong acid resistant, strong alkali resistant, high temperature resistant)
Work plate dimensions: 100×100 mm (4 inches)
Motor type: Maintenance-free, spark-free brushless DC motor
Stirring capacity: Up to 10 liters (H₂O)
Speed range: 100 to 1500 rpm (adjustable in 1 rpm increments)
Speed display resolution: 1 rpm
Heating temperature range: Room temperature to 550°C (adjustable in 1°C increments)
Temperature control accuracy (without external sensor): ±1°C (below 100°C) / ±1% (above 100°C)
External temperature sensor (PT1000) accuracy: ±0.2°C for sample temperature control
Temperature display accuracy: ±0.1°C
Heating modes: A (fast heating), B (standard heating), C (stable heating) – three selectable modes
Timer range: 1 minute to 99 hours 59 minutes
Maximum stirring bar length: 40 mm
Heating output power: 500W / 650W (depending on model)
Total power consumption: Approximately 500–650W
Safety protection: Dual independent safety circuits; over-temperature protection (cutoff at approx. 560–580°C)
Data interface: RS232 for remote PC control and data logging
Protection class: IP21 (protection against solid objects >12.5 mm and vertically falling water drops)
Power requirements: 100–120V / 200–240V AC, 50/60 Hz (universal input)
Dimensions (W × D × H): Approximately 270 × 175 × 108 mm (similar to DMS4 base)
Weight: Approximately 2.0–2.5 kg
Operating conditions: 5–40°C, ≤80% relative humidity
Certifications: CE, cTUVus, FCC, CB, UKCA, ICES (typical for DLAB Pro series)

3. PHYSICAL & OPERATIONAL PROPERTIES

Construction: Compact, lightweight design with a small footprint, ideal for individual workstations and crowded benchtops. The glass ceramic work plate provides excellent chemical resistance against strong acids, strong alkalis, and high temperatures up to 550°C. The corrosion-resistant full-metal housing provides good heat dissipation and reliable fire protection.
Display: High-resolution LCD display simultaneously shows set and actual values for both temperature and speed, allowing clear real-time monitoring without toggling modes.
Operation: Simple, intuitive operation with digital controls. Users can set precise temperature (in 1°C increments) and speed (1 rpm resolution) parameters, all clearly displayed on the large screen.
Stirring system: Selected high-temperature resistant strong magnet provides powerful magnetic coupling, preventing the stir bar from decoupling even with viscous liquids at high temperatures or high speeds.
Heating technology: PID controller ensures a precise and stable heating process, preventing temperature overshoot. Three heating modes allow users to choose fast heating for rapid ramp-up or stable heating for minimal overshoot.
Timer function: Integrated programmable timer from 1 minute to 99 hours 59 minutes allows for unattended operation, with the instrument automatically stopping heating and stirring when time elapses and sounding an audible buzzer alert.
Safety functions: Safety lock prevents accidental changes to operating status. Independent residual heat warning ("HOT" indicator lights up >50°C even when the hot plate is turned off) protects users from burns. Dual independent safety circuits provide redundant over-temperature protection.
Data connectivity: RS232 interface allows for remote PC control and the logging of temperature and speed data via free software (e.g., DLAB StirPC), enabling full experiment documentation.
Spill protection: High-efficiency infusion platform and waterproof edge design prevent liquid spills from entering internal electronics and corroding electronic components.
Maintenance: Truly maintenance-free due to its brushless DC motor design, eliminating the need for routine brush replacement. The glass ceramic work plate is easy to clean.

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; certified by TÜV Rheinland or equivalent, meeting CE, cTUVus, FCC, CB, UKCA, and ICES standards.
Dual Over-Temperature Protection: Two independent safety circuits and a built-in thermal fuse provide redundant protection. The instrument automatically stops heating if the work plate exceeds a safe temperature (typically 560–580°C) or if a control sensor fails, preventing runaway heating and fire hazards.
Residual Heat Warning: The "HOT" safety indicator operates independently of the main power switch. It lights up whenever the work plate temperature is above 50°C and remains on even after the unit is turned off until it is safe to touch (temperature drops below 50°C).
Chemical Safety: The glass ceramic work plate is highly resistant to strong acids, strong alkalis, and organic solvents, preventing corrosion and ensuring a long service life even when handling aggressive reagents such as concentrated nitric acid for sample digestion.
Electrical Safety: Designed with a brushless, spark-free DC motor, making it safe for use in environments where flammable solvents may be present. The IP21-rated aluminum housing offers basic protection against solid foreign objects (>12.5 mm) and vertically falling water drops.
Fire Safety: Corrosion-resistant full-metal housing provides good heat dissipation and reliable fire protection, unlike plastic housings that may melt or burn. The glass ceramic work plate is non-flammable.
Spill Protection: The high-efficiency infusion platform and waterproof edge design prevent spilled liquids from entering internal electronics and corroding electronic components, reducing electrical hazard risk.
Operational Safety: The safety lock prevents accidental changes to operating status during critical experiments. The stable, vibration-free operation ensures the stirred sample remains stable and prevents the beaker from drifting or falling over on the work plate.

5. STORAGE & HANDLING ATTRIBUTES

Storage: Store in a clean, dry, dust-free environment at room temperature (15–30°C) when not in use. Cover the instrument with a dust cover to protect the glass ceramic work plate from dust and scratches. Allow the unit to cool completely (check "HOT" indicator off) before storage if recently used.
Installation: Place on a stable, level, non-flammable benchtop away from flammable materials, solvents, and volatile chemicals. Allow at least 10 cm clearance on all sides for heat dissipation. Do not use near water baths or sinks where splashing may occur. Do not place near strong magnetic fields (e.g., large magnets, NMR equipment), which may interfere with the magnetic coupling.
Cleaning: Allow the work plate to cool completely (verify "HOT" indicator is off) before cleaning. Wipe the glass ceramic surface with a soft, damp cloth or sponge using mild detergent or 70% isopropyl alcohol. For stubborn residues, use a glass ceramic scraper. Wipe the metal housing with a soft, damp cloth. Do not immerse the unit in liquid. Do not use abrasive cleaners or metal scouring pads which 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 and free of residues. Verify that no liquid is pooled on or around the unit. Check that the area is free of flammable materials. Ensure the stir bar is in good condition without chips or cracks.
Operation with external sensor (PT1000): Insert the PT1000 temperature sensor probe into the sample vessel and secure it with a stand clamp. Do not allow the sensor wire to contact the hot work plate. Select the appropriate heating mode (fast/standard/stable) for the application. For maximum accuracy, calibrate the temperature offset using a known reference.
Setting safety temperature: Before first use, set an appropriate maximum safety temperature (typically 50–100°C above the highest planned operating temperature but not exceeding 550°C) to prevent accidental overheating.
Timer operation: Program the timer for the desired heating and stirring duration. The timer counts down while the unit operates; when zero is reached, heating and stirring stop automatically and the buzzer sounds. The buzzer can be silenced by pressing any button.
Stirring bar care: Use only magnetic stir bars that are in good condition and appropriate for the vessel size. For the DMS4-550 with a maximum stirring bar length of 40 mm, do not exceed this specification. Start stirring at a low speed (100–200 rpm) and gradually increase to the desired speed to prevent splashing or decoupling.
Cooling down: After use, turn off the power and allow the work plate to cool completely until the "HOT" indicator turns off (typically 30–60 minutes depending on operating temperature) before cleaning, moving, or storing.
PC connection (RS232): Use the RS232 interface to connect to a computer for remote control and data logging. Install the appropriate software (e.g., DLAB StirPC) according to the manufacturer's instructions. Use a properly shielded RS232 cable to prevent electromagnetic interference.
Periodic verification: Verify temperature accuracy periodically using a calibrated external thermometer or thermocouple. If deviation exceeds specifications (±1°C below 100°C or ±1% above 100°C), consult the manufacturer's service guidelines for recalibration.

6. LABORATORY & CLINICAL APPLICATIONS

Primary Application: General purpose heating and stirring of liquids for clinical diagnostics (clinical chemistry sample digestion, protein denaturation, reagent preparation), pharmaceutical and food analysis (sample dissolution, standard solution preparation), water quality and environmental monitoring (sample digestion, BOD/COD testing), and research labs where precise, programmable, and safe heating and stirring up to 550°C is required.
Clinical Role: A versatile and essential instrument for hospital and clinical laboratories, molecular diagnostics labs, clinical chemistry departments, immunology laboratories, microbiology laboratories, pharmaceutical quality control facilities, environmental testing stations, and research institutions. Critical for sample digestion for trace element analysis, media preparation, enzyme activity assays, and temperature-critical diagnostic procedures where accurate, reproducible, and safe heating with simultaneous stirring is mandatory for diagnostic accuracy and patient safety.

SAFETY HANDLING PRECAUTIONS

1. SAFETY PRECAUTIONS

Burn Hazard: The glass ceramic work plate can reach 550°C and remains hot for an extended period after the power is turned off. Do not touch the work plate for at least 30–60 minutes after use, or until the residual heat "HOT" indicator turns off. Use heat-resistant gloves or tools when handling vessels on the hot plate. Severe burns can occur upon contact.
Fire Hazard: Do not operate the hotplate stirrer near flammable materials, volatile solvents, combustible gases, or paper products. Keep the work area clear of flammable substances. Do not leave the instrument unattended while operating at high temperatures. Always set an appropriate safety temperature limit. Use a fume hood when heating volatile or hazardous samples.
Electrical Safety: Do not operate the instrument with wet hands. Disconnect the power cord before cleaning or servicing. Use only the supplied grounded power cord and ensure the outlet provides proper grounding. Do not operate if the power cord is damaged or if liquid has spilled into the instrument. The IP21 rating offers basic protection only; do not immerse or allow significant liquid ingress.
Chemical Compatibility: The glass ceramic work plate is resistant to strong acids, strong alkalis, and organic solvents. However, some chemicals may produce toxic fumes when heated. Always use appropriate ventilation (fume hood) when heating hazardous or volatile chemicals. Refer to Safety Data Sheets (SDS) for specific chemicals. Clean spills immediately to prevent damage and chemical exposure.
Spill Hazard: If a liquid spill occurs on the hot work plate during operation, the liquid may evaporate rapidly and produce steam or hazardous vapors. Standing liquids may cause thermal shock to the glass ceramic plate, potentially causing cracking or breakage. Turn off power immediately and allow to cool before cleaning.
Vessel Selection: Use only heat-resistant glassware (borosilicate glass such as Pyrex or Kimax) or other laboratory vessels rated for the operating temperature (up to 550°C). Do not use standard soda-lime glass or plastic vessels on the hot plate, as they may melt, crack, or shatter. Ensure vessels are stable and not likely to tip over.
External Sensor Safety: When using the PT1000 external temperature sensor, ensure the sensor probe is properly inserted into the vessel or securely attached to the surface being controlled. Do not allow the sensor wire to contact the hot work plate, as this may melt the wire insulation and cause sensor failure, electrical hazard, or burns.
Magnetic Interference: The strong permanent magnets in the stirrer can interfere with pacemakers, implantable cardioverter-defibrillators (ICDs), and other medical devices. Keep a safe distance (at least 30 cm) from such devices. Do not place the stirrer near sensitive electronic equipment or magnetic storage media (hard drives, credit cards, magnetic ID badges).
Ventilation: Operate the hotplate stirrer in a well-ventilated area or under a fume hood when heating chemicals that may produce harmful vapors. Do not block ventilation around the unit. The full-metal housing dissipates heat; ensure adequate airflow.
Training Requirement: Only trained laboratory personnel with appropriate technical background in hot plate and stirrer operation should operate the DMS4-550 (MS4-H550-Pro) for clinical diagnostic or research applications. Users should read and understand the operator's manual before first use.

2. FIRST AID MEASURES

Burn from Hot Surface: If skin contacts the hot work plate or housing, immediately cool the burn area with cool (not cold) running water for at least 15 minutes. Do not apply ice directly to the burn. Remove any jewelry or constrictive items from the affected area. Cover the burn with a sterile, non-adhesive dressing. Seek medical attention for large area burns (larger than palm of hand), deep burns (white or charred appearance), or burns causing blistering. For burns on face, hands, feet, or genitals, seek immediate medical attention.
Fire: If a fire occurs on or near the hotplate stirrer, immediately turn off the power if safe to do so. Use a class ABC dry chemical fire extinguisher or carbon dioxide (CO₂) extinguisher. Do not use water on electrical fires. Evacuate the area if the fire cannot be immediately controlled. Call emergency services.
Chemical Splash to Eyes: If a heated chemical sample or reagent splashes into the eyes, immediately flush eyes with copious amounts of cool water or sterile saline for at least 15 minutes. Hold eyelids open to ensure thorough rinsing. Remove contact lenses if present and easily removable. Seek immediate medical attention. Do not attempt to neutralize the chemical in the eye.
Chemical Splash to Skin: Remove contaminated clothing immediately. Flush the affected skin area with cool running water for at least 15 minutes. Do not rub or scrub. Seek medical evaluation for chemical burns or if irritation persists. Refer to the Safety Data Sheet (SDS) for the specific chemical involved.
Inhalation of Fumes: If fumes from heated chemicals are inhaled, move the affected person to fresh air immediately. Keep the person warm and at rest. If breathing is difficult, administer oxygen if trained. If breathing stops, perform CPR. Seek immediate medical attention.
Electrical Shock: If an electrical shock incident occurs, disconnect power at the circuit breaker before attempting to assist the victim. Do not touch the victim until power is disconnected. Once safe, assess the victim for responsiveness and breathing. Call emergency medical services immediately. Perform CPR if trained and necessary. Seek medical evaluation for all electrical shock victims, even if symptoms appear mild.
Thermal Shock to Glassware Breakage: If a glass vessel cracks or shatters due to thermal shock, do not touch the broken glass. Turn off the power and allow the work plate to cool completely. Use forceps or a brush and dustpan to collect glass shards. Dispose of broken glass in a sharps container. If glass punctures the skin, treat as a sharps injury: allow wound to bleed freely, wash with soap and water for 15 minutes, apply antiseptic and sterile bandage, and seek medical attention.

3. FIRE FIGHTING MEASURES

Flammability: The instrument's full-metal housing is non-flammable, but the power cord, internal wiring, electronic components, and plastic control knobs are combustible. The glass ceramic work plate is non-flammable. The primary fire hazard is the flammable chemicals, solvents, or materials being heated on the plate.
Extinguishing Media: Use carbon dioxide (CO₂), dry chemical (ABC class), or alcohol-resistant foam extinguishers for fires involving the electrical components or nearby flammable materials. Do not use water on electrical fires, as water conducts electricity and can cause electrical shock or damage the instrument.
Fire Response: Immediately disconnect power to the instrument if safe to do so. Evacuate the immediate area. Use an appropriate fire extinguisher for small, contained fires. For larger fires, evacuate the laboratory and call emergency services. Do not attempt to extinguish a fire if you are not trained or if the fire is spreading rapidly.
Special Protective Equipment for Firefighters: Firefighters should wear self-contained breathing apparatus (SCBA) and full structural firefighting gear (including gloves, boots, helmet, and turnout coat) when fighting fires in laboratory settings, as combustion products may include toxic fumes from burning plastics, chemicals, and electronic components. Cool the instrument with water spray from a safe distance after power is disconnected to prevent re-ignition.

Magnetic Hotplate Stirrer (DMS4-550)

Magnetic Hotplate Stirrer (DMS4-550)

PRIMARY CLINICAL & DIAGNOSTIC USES

SECONDARY & SUPPORTIVE USES

1. BASIC IDENTIFICATION ATTRIBUTES

Device Type: A programmable, LCD digital heating magnetic stirrer with a 4-inch glass ceramic work plate and a brushless DC motor.

Designation: Magnetic Hotplate Stirrer (DMS4-550), MS4-H550-Pro, DLAB DMS4-550, 4-Inch Hotplate Magnetic Stirrer.

Key Components:

4-inch (100×100 mm) glass ceramic work plate (strong acid resistant, strong alkali resistant, high temperature resistant)

Maintenance-free, spark-free brushless DC motor

High-resolution LCD display showing set and actual values for both speed and temperature simultaneously

PID temperature controller for stable, precise heating processes

PT1000 external temperature sensor port for precise sample temperature control (±0.2°C accuracy)

Three selectable heating modes: fast heating, standard heating, and stable heating

Programmable timer (1 minute to 99 hours 59 minutes)

RS232 data interface for remote PC control and data transmission

Built-in "HOT" safety indicator (lights up when plate temperature >50°C, even after unit is off)

Safety lock to prevent accidental changes to operating status

Dual independent safety circuits with over-temperature protection (shuts off heating at 550°C+ safety margin)

Corrosion-resistant full-metal housing with heat dissipation and fire protection

High-efficiency infusion platform and waterproof edge design

2. TECHNICAL & PERFORMANCE PROPERTIES

Work plate material: Glass ceramic (strong acid resistant, strong alkali resistant, high temperature resistant)

Work plate dimensions: 100×100 mm (4 inches)

Motor type: Maintenance-free, spark-free brushless DC motor

Stirring capacity: Up to 10 liters (H₂O)

Speed range: 100 to 1500 rpm (adjustable in 1 rpm increments)

Speed display resolution: 1 rpm

Heating temperature range: Room temperature to 550°C (adjustable in 1°C increments)

Temperature control accuracy (without external sensor): ±1°C (below 100°C) / ±1% (above 100°C)

External temperature sensor (PT1000) accuracy: ±0.2°C for sample temperature control

Temperature display accuracy: ±0.1°C

Heating modes: A (fast heating), B (standard heating), C (stable heating) – three selectable modes

Timer range: 1 minute to 99 hours 59 minutes

Maximum stirring bar length: 40 mm

Heating output power: 500W / 650W (depending on model)

Total power consumption: Approximately 500–650W

Safety protection: Dual independent safety circuits; over-temperature protection (cutoff at approx. 560–580°C)

Data interface: RS232 for remote PC control and data logging

Protection class: IP21 (protection against solid objects >12.5 mm and vertically falling water drops)

Power requirements: 100–120V / 200–240V AC, 50/60 Hz (universal input)

Dimensions (W × D × H): Approximately 270 × 175 × 108 mm (similar to DMS4 base)

Weight: Approximately 2.0–2.5 kg

Operating conditions: 5–40°C, ≤80% relative humidity

Certifications: CE, cTUVus, FCC, CB, UKCA, ICES (typical for DLAB Pro series)

3. PHYSICAL & OPERATIONAL PROPERTIES

Display: High-resolution LCD display simultaneously shows set and actual values for both temperature and speed, allowing clear real-time monitoring without toggling modes.

Operation: Simple, intuitive operation with digital controls. Users can set precise temperature (in 1°C increments) and speed (1 rpm resolution) parameters, all clearly displayed on the large screen.

Stirring system: Selected high-temperature resistant strong magnet provides powerful magnetic coupling, preventing the stir bar from decoupling even with viscous liquids at high temperatures or high speeds.

Heating technology: PID controller ensures a precise and stable heating process, preventing temperature overshoot. Three heating modes allow users to choose fast heating for rapid ramp-up or stable heating for minimal overshoot.

Timer function: Integrated programmable timer from 1 minute to 99 hours 59 minutes allows for unattended operation, with the instrument automatically stopping heating and stirring when time elapses and sounding an audible buzzer alert.

Safety functions: Safety lock prevents accidental changes to operating status. Independent residual heat warning ("HOT" indicator lights up >50°C even when the hot plate is turned off) protects users from burns. Dual independent safety circuits provide redundant over-temperature protection.

Data connectivity: RS232 interface allows for remote PC control and the logging of temperature and speed data via free software (e.g., DLAB StirPC), enabling full experiment documentation.

Spill protection: High-efficiency infusion platform and waterproof edge design prevent liquid spills from entering internal electronics and corroding electronic components.

Maintenance: Truly maintenance-free due to its brushless DC motor design, eliminating the need for routine brush replacement. The glass ceramic work plate is easy to clean.

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; certified by TÜV Rheinland or equivalent, meeting CE, cTUVus, FCC, CB, UKCA, and ICES standards.

Residual Heat Warning: The "HOT" safety indicator operates independently of the main power switch. It lights up whenever the work plate temperature is above 50°C and remains on even after the unit is turned off until it is safe to touch (temperature drops below 50°C).

Chemical Safety: The glass ceramic work plate is highly resistant to strong acids, strong alkalis, and organic solvents, preventing corrosion and ensuring a long service life even when handling aggressive reagents such as concentrated nitric acid for sample digestion.

Electrical Safety: Designed with a brushless, spark-free DC motor, making it safe for use in environments where flammable solvents may be present. The IP21-rated aluminum housing offers basic protection against solid foreign objects (>12.5 mm) and vertically falling water drops.

Fire Safety: Corrosion-resistant full-metal housing provides good heat dissipation and reliable fire protection, unlike plastic housings that may melt or burn. The glass ceramic work plate is non-flammable.

Spill Protection: The high-efficiency infusion platform and waterproof edge design prevent spilled liquids from entering internal electronics and corroding electronic components, reducing electrical hazard risk.

Operational Safety: The safety lock prevents accidental changes to operating status during critical experiments. The stable, vibration-free operation ensures the stirred sample remains stable and prevents the beaker from drifting or falling over on the work plate.

5. STORAGE & HANDLING ATTRIBUTES

Setting safety temperature: Before first use, set an appropriate maximum safety temperature (typically 50–100°C above the highest planned operating temperature but not exceeding 550°C) to prevent accidental overheating.

Timer operation: Program the timer for the desired heating and stirring duration. The timer counts down while the unit operates; when zero is reached, heating and stirring stop automatically and the buzzer sounds. The buzzer can be silenced by pressing any button.

Cooling down: After use, turn off the power and allow the work plate to cool completely until the "HOT" indicator turns off (typically 30–60 minutes depending on operating temperature) before cleaning, moving, or storing.

PC connection (RS232): Use the RS232 interface to connect to a computer for remote control and data logging. Install the appropriate software (e.g., DLAB StirPC) according to the manufacturer's instructions. Use a properly shielded RS232 cable to prevent electromagnetic interference.

Periodic verification: Verify temperature accuracy periodically using a calibrated external thermometer or thermocouple. If deviation exceeds specifications (±1°C below 100°C or ±1% above 100°C), consult the manufacturer's service guidelines for recalibration.

6. LABORATORY & CLINICAL APPLICATIONS

1. SAFETY PRECAUTIONS

Ventilation: Operate the hotplate stirrer in a well-ventilated area or under a fume hood when heating chemicals that may produce harmful vapors. Do not block ventilation around the unit. The full-metal housing dissipates heat; ensure adequate airflow.

Training Requirement: Only trained laboratory personnel with appropriate technical background in hot plate and stirrer operation should operate the DMS4-550 (MS4-H550-Pro) for clinical diagnostic or research applications. Users should read and understand the operator's manual before first use.

2. FIRST AID MEASURES

Inhalation of Fumes: If fumes from heated chemicals are inhaled, move the affected person to fresh air immediately. Keep the person warm and at rest. If breathing is difficult, administer oxygen if trained. If breathing stops, perform CPR. Seek immediate medical attention.

3. FIRE FIGHTING MEASURES

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