Magnetic Hotplate Stirrer (DMS5)

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The Magnetic Hotplate Stirrer (DMS5) 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 up to 20 liters with a powerful heating capability up to 340°C on a 5-inch (Ø135 mm) ceramic-coated aluminum work plate, the DMS5 is the ideal choice for demanding laboratory applications including high-viscosity sample mixing, strong acid digestions, culture media preparation, and chemical synthesis.

The Magnetic Hotplate Stirrer (DMS5) series offers 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 upon completion and independent heating/stirring control. Safety is paramount with dual independent safety circuits providing redundant over-temperature protection, an independent residual heat warning indicator (“HOT” lights up at >50°C and stays on even after the unit is turned off), a safety lock to prevent accidental setting changes, and IP42 protection class for dust and water resistance.

The DMS5-340M variant features an enhanced magnetic technology with a high-temperature resistant strong magnet, providing extra stirring torque necessary for working with viscous liquids such as 50% glycerol, concentrated cell lysates, and dissolved polymers.

For the clinical laboratory scientist, trace element analysis technologist, and pharmaceutical quality control analyst, the DMS5 Magnetic Hotplate Stirrer delivers the programmable, precise, and safe heating and stirring required for clinical chemistry sample preparation, trace metal analysis sample digestion (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 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 (DMS5)

PRIMARY CLINICAL & DIAGNOSTIC USES

1. High-Throughput Heating and Stirring for Clinical Sample Preparation
Primary Use: Provides a programmable, LCD digital magnetic hotplate stirrer with a 5-inch (135 mm) ceramic-coated aluminum work plate and a high-torque maintenance-free brushless DC motor, engineered for the simultaneous heating and mixing of clinical samples, reagents, buffers, and biological specimens. It features a robust magnetic stirring capability with a maximum stirring capacity of up to 20 liters, a speed range of 50 to 1500 rpm adjustable in precise 1 rpm increments, and a heating range from room temperature to 340°C in 1°C increments.

How it helps: For the clinical chemistry technologist and medical technologist, the Magnetic Hotplate Stirrer (DMS5) offers three selectable heating modes—fast, standard, and stable—allowing users to choose the optimal thermal profile for their specific application. An optional PT1000 external sensor (sold separately) provides ±0.2°C accuracy for controlling the actual temperature of the sample liquid. For the patient, precise heating and reproducible mixing ensure consistent reagent preparation and sample processing, directly supporting accurate diagnostic test results and reliable clinical decision-making.

2. High-Viscosity Sample Processing and Digestion for Trace Element Analysis
Primary Use: For demanding workflows such as trace metal analysis and protein digestion, the DMS5-340M variant features a enhanced magnetic technology or “strong magnetic field” that provides powerful stirring for viscous liquids, high-density solutions, and plant or tissue digests, making it ideal for dissolving and mixing challenging samples in clinical diagnostic workflows with maximum stirring capacity up to 20 liters.

How it helps: For the trace element analysis specialist, the enhanced magnetic coupling ensures the stir bar remains locked to the rotating field even when mixing thick liquids like concentrated cell lysates, 50% glycerol solutions, or acid-digested plant biomass, delivering consistent agitation performance for challenging diagnostic preparation protocols. For the patient undergoing heavy metal screening, nutritional deficiency testing, or toxicology analysis, accurate sample digestion and mixing support reliable detection and quantification, enabling correct diagnosis and appropriate treatment.

3. Preparation of Culture Media and Reagents in Clinical Microbiology
Primary Use: Enables the safe heating, sterilization, and simultaneous mixing of solid or solidified culture media, agars, broths, and solutions in heat-resistant glassware, including the preparation of nutrient agar plates, slants, and enrichment broth tubes for pathogen isolation and antimicrobial susceptibility testing.

How it helps: For the clinical microbiology technologist, the Magnetic Hotplate Stirrer (DMS5) uniform ceramic-coated heating surface (Ø135 mm) ensures even heat distribution to prevent burning of sensitive media components, and the stirring function (up to 1500 rpm) helps maintain a homogenous suspension of ingredients before solidification. The programmable timer, ranging from 1 minute to 99 hours 59 minutes, allows for unattended sterilization or melting procedures. For the patient, properly prepared culture media support accurate identification of infectious pathogens, enabling appropriate antimicrobial therapy selection.

4. Incubation and Enzyme Activity Assays in Clinical Biochemistry
Primary Use: Used for precise temperature-controlled incubation of reaction mixtures in clinical biochemistry workflows, including ELISA plate development, enzyme-linked immunosorbent assays, and kinetic enzyme activity determinations (e.g., ALT, AST, ALP), where stable heating and gentle mixing are required for accurate color development.

How it helps: For the immunology laboratory technologist, the Magnetic Hotplate Stirrer (DMS5) can be used as a compact incubator for 96-well microplates, tubes, or cuvettes placed directly on the 5-inch heating surface. The PT1000 external sensor port enables direct liquid temperature monitoring, and the three heating modes allow selection of rapid temperature ramp-up (A-mode) or minimal-overshoot stable heating (C-mode) for sensitive biological assays. For the patient, consistent incubation conditions ensure reliable detection of disease markers for autoimmune conditions, infectious diseases, and allergies, reducing the risk of false results.

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 340°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 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 an independent “HOT” safety 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 for complete experiment documentation.

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

6. 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 vessels and reaction blocks, capable of reaching 340°C for high-temperature reactions with uniform parallel magnetic field optimized for synthetic biology.

7. 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.

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

9. Viscosity testing of liquid samples: Maintains liquid samples under controlled, constant stirring for viscosity measurement using viscometers, supporting quality control in pharmaceutical, chemical, and food industries where sample homogeneity is critical, with strong magnetic field variant (340M) optimized for high-viscosity liquids.

10. 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 5-inch ceramic-coated aluminum work plate and a high-torque brushless DC motor.
Designation:Magnetic Hotplate Stirrer (DMS5), DLAB DMS5-340 (Standard), DLAB DMS5-340M (Strong Magnetic), DMS5-340 LCD Heating Magnetic Stirrer with Timer, 5-inch Digital Hotplate Stirrer.
Key Components:
- 5-inch (Ø135 mm) ceramic-coated aluminum work plate for chemical resistance and uniform heat distribution
- Maintenance-free, spark-free brushless DC motor
- High-resolution LCD display showing set and actual values for speed, temperature, and timer simultaneously
- PID temperature controller with three selectable heating modes: fast heating (A), standard heating (B), and stable heating (C)
- PT1000 external temperature sensor port for precise sample temperature control (±0.2°C accuracy)
- Programmable timer (1 minute to 99 hours 59 minutes) with independent heating/stirring control
- RS232 data interface for remote PC control and data transmission
- Independent "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 for continuous system monitoring and automatic shutdown
- Buzzer for fault and timer completion alerts

2. TECHNICAL & PERFORMANCE PROPERTIES

Work plate dimensions: Ø135 mm (5 inches)
Work plate material: Aluminum with ceramic coating (strong acid resistant, corrosion-resistant, easy to clean)
Motor type: Maintenance-free, spark-free brushless DC motor
Stirring capacity (H₂O): Up to 20 liters
Speed range: 50 to 1500 rpm (adjustable in 1 rpm increments)
Speed display: LCD digital display
Heating temperature range: Room temperature to 340°C (adjustable in 1°C increments)
Temperature control accuracy: ±1°C (below 100°C) / ±1% (above 100°C)
External temperature sensor (PT1000) accuracy: ±0.2°C
Temperature display accuracy: ±0.1°C
Heating modes: A (fast heating), B (standard heating), C (stable heating) – three selectable modes with independent light indicators
Timer range: 1 minute to 99 hours 59 minutes, programmable via "+" and "-" buttons
Maximum stir bar length: 80 mm (recommended 80 mm for 20L capacity)
Motor output power: 10W
Heating output power: 600W
Total power consumption: 650W
Overheating protection: 420°C (hardware cutoff specification)
Residual heat warning: Activates above 50°C; "HOT" indicator闪烁 on display even when unit is powered off
Data interface: RS232
Protection class: IP42 (dust and water resistance, improved from IP21)
Dimensions (L × W × H): 270 × 175 × 98 mm
Weight: 2.2 kg
Power requirements: 100–120V / 200–240V AC, 50/60 Hz (universal input)
Operating conditions: 5–40°C, ≤80% relative humidity
Certifications: CE, etc., meeting international product safety and electromagnetic compatibility standards

3. PHYSICAL & OPERATIONAL PROPERTIES

Construction: Durable benchtop enclosure with corrosion-resistant all-metal housing, providing good heat dissipation and reliable fire protection (unlike plastic housings that may melt or burn)
Work plate: Ceramic-coated aluminum disc for enhanced corrosion resistance, rapid heat transfer, and easy cleaning; withstands strong acids and organic solvents commonly used in clinical and research labs.
Display: High-resolution LCD screen with backlight, clearly showing set and actual stirring speed (RPM), timer, and temperature parameters for precise control and monitoring throughout experiments.
Operation: Simple, intuitive operation with digital control knobs or buttons. Users can set precise temperature (1°C increments) and speed (1 rpm resolution) parameters, with direct menu navigation.
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 with independent heating/stirring control—upon completion, the unit stops heating but maintains stirring to prevent thermal degradation of samples.
Safety functions: Keypad lock prevents accidental changes once parameters are set. 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, with automatic shutdown on sensor failure or short circuit.
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 and integration into automated lab workflows.
Spill protection: Raised waterproof edge and drainage platform prevent liquid spills from entering internal electronics and corroding components. IP42-rated housing offers superior dust and water resistance compared to IP21.
Maintenance: Truly maintenance-free due to its brushless DC motor design, eliminating the need for routine brush replacement. The ceramic-coated aluminum work plate is easy to clean and chemically resistant.

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; CE certified, meeting international product safety standards for laboratory equipment.
Dual Over-Temperature Protection: Two independent safety circuits and a thermal fuse provide redundant protection. The instrument automatically stops heating if the work plate exceeds 420°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 on the LCD display 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 ceramic-coated aluminum work plate is resistant to strong acids, strong alkalis, and organic solvents, preventing corrosion and ensuring a long service life even when handling aggressive reagents.
Electrical Safety: Designed with a brushless, spark-free DC motor, making it safe for use in environments where flammable solvents may be present. The IP42-rated housing offers dust and water resistance, reducing electrical hazard risk from spills.
Fire Safety: Corrosion-resistant full-metal housing provides good heat dissipation and reliable fire protection, unlike plastic housings that may melt or burn. The ceramic-coated work plate is non-flammable.
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.
Spill and Particulate Protection: IP42 protection rating guards against solid objects larger than 1 mm and vertically falling water drops, improving durability in high-throughput laboratory environments.
Buzzer Alerts: Audible alerts for fault conditions (sensor failure, over-temperature) and timer completion, ensuring operators are promptly notified of instrument status changes.

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 ceramic-coated 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 ceramic-coated work plate and all-metal housing with a soft, damp cloth or sponge using mild detergent or 70% isopropyl alcohol. For stubborn residues, use a non-abrasive cleaner suitable for ceramic coatings. Do not immerse the unit in liquid. Do not use abrasive cleaners, metal scouring pads, or sharp objects which may scratch the ceramic coating.
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.
Timer operation: Program the timer for the desired heating and stirring duration. The timer counts down while the unit operates; when zero is reached, the unit stops heating but continues stirring to prevent sample degradation, 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 DMS5 with up to 20L capacity, use stir bars up to 80 mm in length. Use the DMS5-340M variant with enhanced magnetic field for stir bars up to 80 mm when mixing viscous liquids. 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 preparation, high-viscosity liquid handling), pharmaceutical and food analysis (sample digestion, standard solution preparation), water quality and environmental monitoring, and research labs where precise, programmable, and safe heating and stirring up to 340°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, high-viscosity sample mixing, 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 ceramic-coated aluminum work plate can reach 340°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 IP42 rating offers moderate protection only; do not immerse or allow significant liquid ingress.
Chemical Compatibility: The ceramic-coated aluminum 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 ceramic-coated plate, potentially causing cracking or damage. 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 340°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 (optional, sold separately), 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). The DMS5-340M variant has an even stronger magnetic field for viscous samples and requires extra caution near sensitive devices.
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 all-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 DMS5 Magnetic Hotplate Stirrer 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 until the "HOT" indicator turns off. 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 all-metal housing is non-flammable, but the power cord, internal wiring, electronic components, and plastic control elements are combustible. The ceramic-coated aluminum 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 (DMS5)

The DMS5-340M variant features an enhanced magnetic technology with a high-temperature resistant strong magnet, providing extra stirring torque necessary for working with viscous liquids such as 50% glycerol, concentrated cell lysates, and dissolved polymers.

Magnetic Hotplate Stirrer (DMS5)

PRIMARY CLINICAL & DIAGNOSTIC USES

SECONDARY & SUPPORTIVE USES

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

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 for complete experiment documentation.

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

1. BASIC IDENTIFICATION ATTRIBUTES

Device Type: A programmable, LCD digital heating magnetic stirrer with a 5-inch ceramic-coated aluminum work plate and a high-torque brushless DC motor.

Designation:Magnetic Hotplate Stirrer (DMS5), DLAB DMS5-340 (Standard), DLAB DMS5-340M (Strong Magnetic), DMS5-340 LCD Heating Magnetic Stirrer with Timer, 5-inch Digital Hotplate Stirrer.

Key Components:

5-inch (Ø135 mm) ceramic-coated aluminum work plate for chemical resistance and uniform heat distribution

Maintenance-free, spark-free brushless DC motor

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

PID temperature controller with three selectable heating modes: fast heating (A), standard heating (B), and stable heating (C)

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

Programmable timer (1 minute to 99 hours 59 minutes) with independent heating/stirring control

RS232 data interface for remote PC control and data transmission

Independent "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 for continuous system monitoring and automatic shutdown

Buzzer for fault and timer completion alerts

2. TECHNICAL & PERFORMANCE PROPERTIES

Work plate dimensions: Ø135 mm (5 inches)

Work plate material: Aluminum with ceramic coating (strong acid resistant, corrosion-resistant, easy to clean)

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

Stirring capacity (H₂O): Up to 20 liters

Speed range: 50 to 1500 rpm (adjustable in 1 rpm increments)

Speed display: LCD digital display

Heating temperature range: Room temperature to 340°C (adjustable in 1°C increments)

Temperature control accuracy: ±1°C (below 100°C) / ±1% (above 100°C)

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

Temperature display accuracy: ±0.1°C

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

Timer range: 1 minute to 99 hours 59 minutes, programmable via "+" and "-" buttons

Maximum stir bar length: 80 mm (recommended 80 mm for 20L capacity)

Motor output power: 10W

Heating output power: 600W

Total power consumption: 650W

Overheating protection: 420°C (hardware cutoff specification)

Residual heat warning: Activates above 50°C; "HOT" indicator闪烁 on display even when unit is powered off

Data interface: RS232

Protection class: IP42 (dust and water resistance, improved from IP21)

Dimensions (L × W × H): 270 × 175 × 98 mm

Weight: 2.2 kg

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

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

Certifications: CE, etc., meeting international product safety and electromagnetic compatibility standards

3. PHYSICAL & OPERATIONAL PROPERTIES

Construction: Durable benchtop enclosure with corrosion-resistant all-metal housing, providing good heat dissipation and reliable fire protection (unlike plastic housings that may melt or burn)

Work plate: Ceramic-coated aluminum disc for enhanced corrosion resistance, rapid heat transfer, and easy cleaning; withstands strong acids and organic solvents commonly used in clinical and research labs.

Display: High-resolution LCD screen with backlight, clearly showing set and actual stirring speed (RPM), timer, and temperature parameters for precise control and monitoring throughout experiments.

Operation: Simple, intuitive operation with digital control knobs or buttons. Users can set precise temperature (1°C increments) and speed (1 rpm resolution) parameters, with direct menu navigation.

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 with independent heating/stirring control—upon completion, the unit stops heating but maintains stirring to prevent thermal degradation of samples.

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 and integration into automated lab workflows.

Spill protection: Raised waterproof edge and drainage platform prevent liquid spills from entering internal electronics and corroding components. IP42-rated housing offers superior dust and water resistance compared to IP21.

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

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; CE certified, meeting international product safety standards for laboratory equipment.

Dual Over-Temperature Protection: Two independent safety circuits and a thermal fuse provide redundant protection. The instrument automatically stops heating if the work plate exceeds 420°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 on the LCD display 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 ceramic-coated aluminum work plate is resistant to strong acids, strong alkalis, and organic solvents, preventing corrosion and ensuring a long service life even when handling aggressive reagents.

Electrical Safety: Designed with a brushless, spark-free DC motor, making it safe for use in environments where flammable solvents may be present. The IP42-rated housing offers dust and water resistance, reducing electrical hazard risk from spills.

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

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.

Spill and Particulate Protection: IP42 protection rating guards against solid objects larger than 1 mm and vertically falling water drops, improving durability in high-throughput laboratory environments.

Buzzer Alerts: Audible alerts for fault conditions (sensor failure, over-temperature) and timer completion, ensuring operators are promptly notified of instrument status changes.

5. STORAGE & HANDLING ATTRIBUTES

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

2. FIRST AID MEASURES

3. FIRE FIGHTING MEASURES

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