LCD Digital Heating Magnetic Stirrer (DMS5-340)

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The LCD Digital Heating Magnetic Stirrer (DMS5-340) 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 20 liters with a powerful heating capability up to 340°C on a 5-inch (Ø135 mm) ceramic-coated aluminum work plate, the LCD Digital Heating Magnetic Stirrer (DMS5-340) is the ideal choice for demanding laboratory applications including sample digestion with strong acids for trace metal analysis, culture media preparation, and chemical synthesis.

Every LCD Digital Heating Magnetic Stirrer (DMS5-340) 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 ceramic-coated aluminum work plate provides exceptional chemical resistance against strong acids and alkalis, ensuring long-term durability even with aggressive reagents such as 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 (A), standard heating (B), and stable heating (C)—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 (heating stops, stirring continues to prevent sample degradation) and an audible buzzer alert. The powerful parallel magnetic field provides uniform stirring at any position on the plate, making the DMS5-340 ideal for parallel reactions in synthetic biology and molecular diagnostics workflows. Safety is paramount with dual independent safety circuits providing redundant over-temperature protection, an independent residual heat warning indicator (“HOT” flashes at >50°C and continues even after the unit is turned off), a safety lock to prevent accidental setting changes, adjustable safety temperature (50–420°C), and IP42 protection class for dust and water resistance. The RS232 data interface enables remote PC control and data logging for full experiment documentation.

For the clinical laboratory scientist, trace element analysis technologist, and pharmaceutical quality control analyst, the LCD Digital Heating Magnetic Stirrer (DMS5-340) delivers the programmable, precise, and safe heating and stirring required for clinical chemistry sample digestion, trace metal analysis sample preparation (blood lead, urine cadmium, heavy metals), 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

LCD Digital Heating Magnetic Stirrer (DMS5-340)

PRIMARY CLINICAL & DIAGNOSTIC USES

1. High-Precision Heating and Stirring for Clinical Sample Preparation
Primary Use: Provides a programmable, LCD digital heating magnetic stirrer with a 5-inch (Ø135 mm) ceramic-coated aluminum work plate and a maintenance-free brushless DC motor, used for the simultaneous heating and mixing of clinical samples, reagents, buffers, and biological specimens, with a maximum stirring capacity of 20 liters, a stepless speed range of 50 to 1500 rpm adjustable in 1 rpm increments, and a heating temperature range from room temperature up to 340°C in 1°C increments.

How it helps: For the clinical laboratory scientist and medical technologist, the LCD Digital Heating Magnetic Stirrer (DMS5-340) 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 ceramic-coated aluminum work plate provides excellent chemical resistance against strong acids and alkalis while ensuring uniform heat distribution across the entire 135 mm surface. The powerful parallel magnetic field generates uniform stirring at any position on the plate, which is essential for achieving consistent results in parallel reactions. 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 LCD Digital Heating Magnetic Stirrer (DMS5-340) 340°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 sample digestion. Three selectable heating modes (A: fast heating, B: standard heating, C: stable heating) give users flexibility to choose the optimal thermal profile for different digestion protocols. The chemical-resistant ceramic-coated plate ensures durability when exposed to harsh digestion reagents, and the uniform 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 LCD Digital Heating Magnetic Stirrer (DMS5-340) uniform heating up to 340°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 but continues stirring to prevent thermal damage to heat-sensitive samples, which is a critical feature for long-duration media preparation. The built-in buzzer provides audible alerts when the timer countdown ends or if a fault occurs, ensuring operators are promptly notified. 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. Precise Temperature Control for Sensitive Biochemical 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, and other temperature-critical diagnostic procedures where precise liquid temperature control is required rather than plate temperature control.

How it helps: For the clinical 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 (A, B, and C) allow users to choose fast heating for rapid temperature ramp-up or stable heating for minimal temperature overshoot, depending on the sensitivity of the assay. The dual independent safety circuits continuously monitor the device, automatically stopping heating and displaying an error message if sensor failure or overheating occurs, and cutting off power in the event of a short circuit to protect both the operator and the sample. For the patient, precise sample temperature control ensures that diagnostic test results for conditions requiring thermal stability 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 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 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” residual heat warning indicator that flashes on the display when the work plate temperature exceeds 50°C (even when 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 ceramic-coated plate resistant to aggressive acids.

6. Parallel reaction and chemical synthesis: The powerful parallel magnetic field provides uniform stirring at any position on the plate, making the DMS5-340 ideal for parallel reactions and synthetic biology workflows where consistent mixing across multiple reaction vessels is required.

7. 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.

8. Protein purification and refolding: Provides controlled temperature (up to 340°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.

9. 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.

10. 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.

11. 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.

12. 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.

13. Parallel genomics and synthetic biology workflows: The uniform parallel magnetic field ensures equal stirring strength across the entire work plate, making this instrument ideal for molecular diagnostics, synthetic biology, and genomics research where consistent mixing across multiple reaction vessels is essential for reproducible results.

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 brushless DC motor.
Designation: LCD Digital Heating Magnetic Stirrer (DMS5-340), DLAB DMS5-340, 5-Inch Timed Heating Magnetic Stirrer, 8021522210 (Product No.).
Key Components:
- 5-inch (Ø135 mm) ceramic-coated aluminum work plate (strong acid resistant, strong alkali resistant, corrosion-resistant, easy to clean)
- Maintenance-free, spark-free brushless DC motor
- High-resolution LCD display showing set and actual values for speed, temperature, and timer simultaneously
- Powerful parallel magnetic field providing uniform stirring at any position on the plate
- PT1000 external temperature sensor port for precise sample temperature control (±0.2°C accuracy)
- Three selectable heating modes: A (fast heating), B (standard heating), C (stable heating)
- Programmable timer (1 minute to 99 hours 59 minutes) with independent heating/stirring control
- RS232 data interface for remote PC control and data transmission
- Safety lock to prevent accidental changes to operating status
- Independent "HOT" safety indicator (flashes when plate temperature >50°C, even after unit is off)
- Dual independent safety circuits for continuous system monitoring
- Buzzer for fault and timer completion alerts
- Corrosion-resistant all-metal housing with heat dissipation and fire protection
- IP42 protection class rating

2. TECHNICAL & PERFORMANCE PROPERTIES

Work plate dimensions: Ø135 mm (5 inches)
Work plate material: Aluminum with ceramic coating (strong acid resistant, strong alkali 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 with 1 rpm resolution
Heating temperature range: Room temperature to 340°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 sample temperature control
Temperature display accuracy: ±0.1°C
Heating modes: Three modes: A (rapid heating), B (standard heating), C (stable heating)
Timer range: 1 minute to 99 hours 59 minutes, programmable via "+" and "-" buttons
Timer behavior: Countdown expires — stops heating, continues stirring (to avoid thermal damage to samples)
Maximum stir bar length: 80 mm
Stirring positions: 1
Motor output power: 10W
Heating output power: 600W
Total power consumption: 650W
Overheating protection: 420°C hardware cutoff
Residual heat warning: Activates above 50°C; "HOT" indicator flashes on display even when unit is powered off
Data interface: RS232
Protection class: IP42 (dust and water resistance)
Power requirements: 100–120V / 200–240V AC, 50/60 Hz (universal input)
Dimensions (L × W × H): 270 × 175 × 98 mm (10.6 × 6.9 × 3.9 inches)
Weight: 2.2 kg (approximately 4.85 lbs)
Operating conditions: 5–40°C, ≤80% relative humidity
Warranty: 2 years
Certifications: CE, meeting international product safety 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). The ceramic-coated aluminum work plate ensures durability against spills and aggressive reagents while providing fast, uniform heat distribution.
Work plate: 5-inch (Ø135 mm) 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.
Magnetic field technology: Powerful parallel magnetic field provides uniform stirring strength at any position on the work plate. This feature is ideal for parallel reactions, synthetic biology, and molecular diagnostics where consistent mixing across multiple reaction vessels is essential.
Display: High-resolution LCD screen simultaneously shows set and actual values for speed (RPM), timer, and temperature parameters, providing complete visibility of all critical operating conditions at a glance without toggling modes.
Operation: Simple, intuitive digital controls. Users can set precise temperature in 1°C increments and speed in 1 rpm resolution, with direct menu navigation.
Heating technology: PID controller ensures precise and stable heating, preventing temperature overshoot. Three heating modes (A, B, C) allow users to choose fast heating for rapid ramp-up, standard heating for general use, 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, heating stops automatically but stirring continues, preventing thermal degradation of heat-sensitive samples.
Safety functions: Safety lock prevents accidental changes once parameters are set. Independent residual heat warning ("HOT" flashes >50°C even when unit is off) protects users from burns. Dual independent safety circuits provide redundant over-temperature protection, automatically stopping heating and displaying an error message if sensor failure or overheating occurs, and cutting off power in the event of a short circuit.
Audible alerts: Buzzer sounds audible alerts for fault conditions (sensor failure, over-temperature) and timer completion, ensuring operators are promptly notified of instrument status changes.
Data connectivity: RS232 interface allows for remote PC control and the logging of temperature and speed data via computer software (e.g., DLAB StirPC), enabling full experiment documentation and integration into automated lab workflows.
Spill protection: IP42-rated housing offers superior dust and water resistance compared to IP21-rated models, improving durability in high-throughput laboratory environments and protecting internal components from spills.
Remote control capability: Enables remote operation from a PC, especially useful when the instrument is placed inside a fume hood where manual adjustments would be inconvenient.
Maintenance: Truly maintenance-free due to its brushless DC motor design, eliminating the need for routine brush replacement. The DC brushless motor is spark-free, long-life, low-noise, and runs smoothly. The ceramic-coated aluminum 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 CE, meeting international product safety standards.
Dual Independent Safety Circuits: Two independent safety circuits continuously monitor the device. In case of overheating or sensor failure, the machine reports an error and stops heating. When a short circuit occurs, the machine automatically cuts off power, protecting the operator and preventing equipment damage.
Over-Temperature Protection: Hardware over-temperature protection cuts off heating at 420°C, preventing runaway heating and fire hazards.
Residual Heat Warning: The independent "HOT" safety indicator activates when the work plate temperature exceeds 50°C. Unlike other warnings, this one continues flashing on the display even after the unit is powered off, alerting users to the dangerously hot surface until it is safe to touch (temperature drops below 50°C).
Safety Lock: Lock function prevents accidental changes to operating status once parameters are set, protecting critical experiments from unintended adjustments and allowing for safe unattended operation.
Adjustable Safety Temperature: Users can set a custom safety temperature within a range of 50–420°C, providing flexibility to tailor instrument behavior according to the specific safety requirements of different applications.
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 chemicals such as 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 IP42-rated housing offers superior dust and water resistance, reducing electrical hazard risk from spills.
Fire Safety: Corrosion-resistant all-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.
Buzzer Alerts: Audible alerts for fault conditions (sensor failure, over-temperature) and timer completion, ensuring operators are promptly notified of instrument status changes.
Quality Assurance: Each unit undergoes individual factory testing, precision calibration, and temperature accuracy verification, documented in an included calibration certificate. The 2-year warranty reflects the manufacturer's confidence in product reliability.

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 to protect the ceramic-coated work plate from dust and scratches. Allow the unit to cool completely (verify "HOT" indicator is 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 or metal scouring pads 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 (A: fast heating, B: standard heating, C: stable heating) for the application.
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 in good condition and appropriate for the vessel size. For the DMS5-340 with up to 20L capacity, use stir bars up to 80 mm in length. Start stirring at a low speed (100–200 rpm) and gradually increase to the desired speed to prevent splashing or decoupling. The anti-stall protection feature automatically regulates motor output to maintain constant speed even when the stir bar begins to decouple.
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.
Safety temperature setting: Before first use, set an appropriate maximum safety temperature using the safety temperature adjustment function. The adjustable range is 50–420°C. Set a value typically 50–100°C above the highest planned operating temperature but not exceeding 420°C (hardware cutoff) to prevent accidental overheating.
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, 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 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 (blood lead, urine cadmium, heavy metals), culture media preparation, enzyme activity assays, dissolution testing, 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 stops flashing. 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).
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 DMS5-340 LCD Digital Heating Magnetic 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 stops flashing. 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.

LCD Digital Heating Magnetic Stirrer (DMS5-340)

LCD Digital Heating Magnetic Stirrer (DMS5-340)

PRIMARY CLINICAL & DIAGNOSTIC USES

SECONDARY & SUPPORTIVE USES

6. Parallel reaction and chemical synthesis: The powerful parallel magnetic field provides uniform stirring at any position on the plate, making the DMS5-340 ideal for parallel reactions and synthetic biology workflows where consistent mixing across multiple reaction vessels is required.

11. 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.

1. BASIC IDENTIFICATION ATTRIBUTES

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

Designation: LCD Digital Heating Magnetic Stirrer (DMS5-340), DLAB DMS5-340, 5-Inch Timed Heating Magnetic Stirrer, 8021522210 (Product No.).

Key Components:

5-inch (Ø135 mm) ceramic-coated aluminum work plate (strong acid resistant, strong alkali resistant, corrosion-resistant, easy to clean)

Maintenance-free, spark-free brushless DC motor

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

Powerful parallel magnetic field providing uniform stirring at any position on the plate

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

Three selectable heating modes: A (fast heating), B (standard heating), C (stable heating)

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

RS232 data interface for remote PC control and data transmission

Safety lock to prevent accidental changes to operating status

Independent "HOT" safety indicator (flashes when plate temperature >50°C, even after unit is off)

Dual independent safety circuits for continuous system monitoring

Buzzer for fault and timer completion alerts

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

IP42 protection class rating

2. TECHNICAL & PERFORMANCE PROPERTIES

Work plate dimensions: Ø135 mm (5 inches)

Work plate material: Aluminum with ceramic coating (strong acid resistant, strong alkali 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 with 1 rpm resolution

Heating temperature range: Room temperature to 340°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 sample temperature control

Temperature display accuracy: ±0.1°C

Heating modes: Three modes: A (rapid heating), B (standard heating), C (stable heating)

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

Timer behavior: Countdown expires — stops heating, continues stirring (to avoid thermal damage to samples)

Maximum stir bar length: 80 mm

Stirring positions: 1

Motor output power: 10W

Heating output power: 600W

Total power consumption: 650W

Overheating protection: 420°C hardware cutoff

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

Data interface: RS232

Protection class: IP42 (dust and water resistance)

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

Dimensions (L × W × H): 270 × 175 × 98 mm (10.6 × 6.9 × 3.9 inches)

Weight: 2.2 kg (approximately 4.85 lbs)

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

Warranty: 2 years

Certifications: CE, meeting international product safety standards

3. PHYSICAL & OPERATIONAL PROPERTIES

Work plate: 5-inch (Ø135 mm) 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.

Magnetic field technology: Powerful parallel magnetic field provides uniform stirring strength at any position on the work plate. This feature is ideal for parallel reactions, synthetic biology, and molecular diagnostics where consistent mixing across multiple reaction vessels is essential.

Display: High-resolution LCD screen simultaneously shows set and actual values for speed (RPM), timer, and temperature parameters, providing complete visibility of all critical operating conditions at a glance without toggling modes.

Operation: Simple, intuitive digital controls. Users can set precise temperature in 1°C increments and speed in 1 rpm resolution, with direct menu navigation.

Heating technology: PID controller ensures precise and stable heating, preventing temperature overshoot. Three heating modes (A, B, C) allow users to choose fast heating for rapid ramp-up, standard heating for general use, 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, heating stops automatically but stirring continues, preventing thermal degradation of heat-sensitive samples.

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

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

Spill protection: IP42-rated housing offers superior dust and water resistance compared to IP21-rated models, improving durability in high-throughput laboratory environments and protecting internal components from spills.

Remote control capability: Enables remote operation from a PC, especially useful when the instrument is placed inside a fume hood where manual adjustments would be inconvenient.

Maintenance: Truly maintenance-free due to its brushless DC motor design, eliminating the need for routine brush replacement. The DC brushless motor is spark-free, long-life, low-noise, and runs smoothly. The ceramic-coated aluminum 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 CE, meeting international product safety standards.

Over-Temperature Protection: Hardware over-temperature protection cuts off heating at 420°C, preventing runaway heating and fire hazards.

Safety Lock: Lock function prevents accidental changes to operating status once parameters are set, protecting critical experiments from unintended adjustments and allowing for safe unattended operation.

Adjustable Safety Temperature: Users can set a custom safety temperature within a range of 50–420°C, providing flexibility to tailor instrument behavior according to the specific safety requirements of different applications.

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 chemicals such as 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 IP42-rated housing offers superior dust and water resistance, reducing electrical hazard risk from spills.

Fire Safety: Corrosion-resistant all-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.

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

Quality Assurance: Each unit undergoes individual factory testing, precision calibration, and temperature accuracy verification, documented in an included calibration certificate. The 2-year warranty reflects the manufacturer's confidence in product reliability.

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 to protect the ceramic-coated work plate from dust and scratches. Allow the unit to cool completely (verify "HOT" indicator is off) before storage if recently used.

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.