Electrophoresis Power supply
Programmable DC power supply for gel electrophoresis with constant voltage/current and gradient modes, supporting up to 4 electrophoresis apparatus with comprehensive safety monitoring.
Louise Corscadden, PhD
Neuroscience · ConductScience
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The Electrophoresis Power Supply provides precise voltage and current control for gel electrophoresis applications in molecular biology research. This rectifier converts AC input to controllable DC output with constant voltage, constant current, and gradient modes to support nucleic acid gel electrophoresis, protein gel electrophoresis, and Western blot protein transfer protocols. Available in dual-channel (SPW-DSE) and single-channel (SPW-6S) configurations, the system accommodates up to 4 electrophoresis apparatus plus 2 light illuminators through 6 output ports.
The unit features programmable operation modes including constant voltage (CV), constant current (CC), gradient voltage (GV), and gradient current (GC) with voltage ranges up to 500-600V and current ranges up to 500-600mA depending on model. Safety features include overvoltage, overcurrent, overload, variable load, and no-load alerts. The 4-inch display provides real-time monitoring of electrical parameters during electrophoretic separations.
How It Works
The electrophoresis power supply operates by converting AC input voltage (110-120V or 180-240V, 50/60Hz) into precisely controlled DC output through rectification and voltage regulation circuits. The system employs feedback control mechanisms to maintain constant voltage or constant current conditions regardless of load variations in the electrophoretic system. During constant voltage mode, the power supply maintains steady voltage while allowing current to vary based on gel resistance and ionic strength. In constant current mode, current remains fixed while voltage adjusts to overcome changing gel resistance as separation progresses.
The gradient modes (GV and GC) enable programmed changes in electrical parameters over time, allowing optimization of separation conditions for different molecular weight ranges or gel concentrations. The dual-channel configuration (SPW-DSE) provides independent control of two separate electrophoretic systems, while the single-channel model (SPW-6S) offers parallel output to multiple connected apparatus. Real-time monitoring through the 4-inch display tracks voltage, current, power, and elapsed time.
Safety circuits continuously monitor output parameters and system status. Overvoltage protection prevents damage to gels and samples, while overcurrent detection guards against short circuits. Variable load and no-load detection algorithms identify connection problems or gel failures, automatically shutting down output to prevent equipment damage.
Features & Benefits
Model
- Dual Module
- Single Module
Instrument Type
- Electrophoresis
Application Area
- Protein Analysis
Automation Level
- manual
frequency
- 50/60HZ
output_channels
- Dual independent outputs
working_modes
- 4 modes: constant voltage, constant current, voltage gradient, current gradient
auxiliary_outputs
- Two sets of 12V outputs
safety_features
- Overvoltage, overcurrent, overload, variable load, and no load alerts
programmable
- Yes
Power/Voltage
- AC 180-240V/110-120V
Display Type
- 4-inch display
Research Domain
- Analytical Chemistry
- Cell Biology
- Histopathology
- Microbiology
- Molecular Biology
- Pharmaceutical QC
Weight
- 7.0 kg
Dimensions
- L: 50.0 mm
- W: 45.0 mm
- H: 30.0 mm
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Output Channels | Dual independent channels (SPW-DSE) or single channel with 6 parallel outputs (SPW-6S) | Many entry-level models offer only single-channel operation without independent control | Independent channel control enables simultaneous operation of different gel types with optimized parameters for each system. |
| Operating Modes | Four programmable modes: constant voltage, constant current, gradient voltage, and gradient current | Basic units typically offer only constant voltage mode | Multiple operating modes allow optimization of separation conditions for different sample types and gel concentrations. |
| Voltage Range | 6-500V (DSE) or 6-600V (6S) with precise control | Lower-end models often limited to 300-400V maximum output | Extended voltage range accommodates both low-voltage protein gels and high-voltage DNA separations in a single instrument. |
| Safety Features | Comprehensive protection including overvoltage, overcurrent, overload, variable load, and no-load detection | Basic models may have limited safety features | Complete safety monitoring prevents sample damage and equipment failure through automatic fault detection and shutdown. |
| Display Interface | 4-inch display with real-time parameter monitoring | Many competitors use smaller LED displays or analog meters | Large display provides clear visibility of electrical parameters and system status for precise control and troubleshooting. |
| Connection Capacity | 6 output ports supporting 4 electrophoresis apparatus plus 2 light illuminators | Standard models typically offer 2-4 output connections | Multiple outputs enable comprehensive gel analysis workflows including illumination systems without requiring additional equipment. |
This electrophoresis power supply offers programmable multi-mode operation with comprehensive safety monitoring and flexible output configurations. The dual-channel capability and extended voltage ranges provide versatility for diverse electrophoretic applications from protein analysis to nucleic acid separations.
Practical Tips
Verify voltage and current accuracy quarterly using precision multimeters across the full operating range.
Why: Accurate electrical parameters are essential for reproducible electrophoretic separations and consistent migration patterns.
Clean output terminals monthly with isopropyl alcohol and inspect for corrosion or loose connections.
Why: Poor connections can cause voltage drops and arcing that damage samples and create safety hazards.
Start protein gels at lower voltage (50-75V) for 30 minutes before increasing to running voltage to prevent band distortion.
Why: Gradual voltage increase allows uniform sample entry into the gel matrix and prevents overheating at the interface.
Use constant current mode for protein gels to maintain consistent temperature as gel resistance increases during the run.
Why: Constant current prevents overheating and band distortion that occurs when using constant voltage with changing gel resistance.
If no-load alarm activates, check all cable connections and ensure electrophoresis apparatus lid is properly closed.
Why: Safety interlocks prevent power output when proper electrical circuit is not established through the gel system.
Never attempt to adjust connections or handle gels while power is applied, even at low voltages.
Why: Electrical contact with buffer solutions can cause shock injury and damage to samples or equipment.
Monitor current draw during DNA gel runs - sudden decreases may indicate gel cracking or buffer depletion.
Why: Current changes reflect gel condition and can indicate problems before they affect separation quality or cause run failure.
Allow 10-15 minutes for power supply stabilization after power-on before starting critical separations.
Why: Electronic components require thermal stabilization for optimal voltage and current regulation accuracy.
Setup Guide
What’s in the Box
- Electrophoresis power supply unit (typical)
- AC power cord (typical)
- Output connection cables with banana plugs (typical)
- User manual and operating instructions (typical)
- Safety guidelines documentation (typical)
Warranty
ConductScience provides standard one-year manufacturer warranty covering defects in materials and workmanship, with comprehensive technical support for installation and operation questions.
Compliance
References
Background reading relevant to this product:
What safety protections are included for sample protection during electrophoresis runs?
The system includes overvoltage, overcurrent, overload, variable load, and no-load detection with automatic output shutdown to prevent gel damage, sample loss, or equipment failure.
Can I run different gel types simultaneously with the dual-channel model?
Yes, the SPW-DSE dual-channel model provides independent control of voltage and current for each channel, allowing simultaneous operation of different gel systems with optimized parameters.
What is the difference between constant voltage and constant current modes for my application?
Constant voltage maintains steady field strength for consistent migration rates, ideal for DNA gels. Constant current prevents overheating in protein gels by maintaining steady power dissipation as gel resistance changes.
How do I determine the appropriate voltage and current settings for my specific gel system?
Consult your gel and buffer manufacturer recommendations. Typical ranges are 100-200V for protein gels and 80-120V for DNA gels, with current adjusted to maintain safe operating temperature.
Can the gradient modes improve separation quality for complex samples?
Yes, voltage gradients can optimize separation by starting with lower field strength for sample entry, then increasing for faster migration. Current gradients help maintain consistent temperature as gel resistance changes.
What maintenance is required for reliable long-term operation?
Regular cleaning of output terminals to prevent corrosion, periodic calibration verification with known loads, and ensuring adequate ventilation around cooling systems.
How many electrophoresis systems can I connect simultaneously?
Each unit supports up to 4 electrophoresis apparatus plus 2 light illuminators through 6 output ports, with total power limited by the 250W (DSE) or 300W (6S) maximum output.
Is the unit compatible with both horizontal and vertical gel systems?
Yes, the power supply is compatible with any electrophoresis apparatus within the specified voltage and current ranges, regardless of gel orientation or chamber design.
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