Desktop COD Water Reactor
Dual-block thermal digestion reactor for COD analysis, processing up to 16 samples simultaneously with independent temperature control from 45-180°C.
Louise Corscadden, PhD
Neuroscience · ConductScience
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The Desktop COD Water Reactor (LH-TX6) is a dual-block thermal digestion system designed for chemical oxygen demand analysis in aqueous samples. The instrument features independent temperature control for two heating blocks, enabling simultaneous processing of up to 16 sample vials at different temperature and time parameters. Operating temperature range spans 45-180°C with ±0.1°C accuracy at 25°C, supporting standard COD digestion protocols including high-temperature sulfuric acid digestion methods.
The reactor incorporates dual-mode operation through both touchscreen and keypad interfaces, allowing flexible control during multi-sample processing. Safety features include over-temperature alarms and programmable timing alerts for reaction completion. The compact design (359×195×167mm, 4kg) accommodates standard laboratory benchtops while providing reliable thermal performance for routine water quality analysis workflows.
How It Works
Chemical oxygen demand analysis relies on controlled thermal digestion of organic compounds in the presence of strong oxidizing agents, typically potassium dichromate in concentrated sulfuric acid. The COD reactor provides precise temperature control necessary for complete oxidation of organic matter during the 2-hour digestion period specified in standard methods.
The dual-block design enables independent operation of two heating zones, each accommodating 8 sample vials. Microprocessor-controlled heating elements maintain stable temperatures within the 45-180°C range, with platinum RTD sensors providing ±0.1°C accuracy. The thermal mass of the aluminum blocks ensures uniform heat distribution across all sample positions.
During operation, sealed sample vials containing prepared reagents undergo controlled heating cycles. The high-temperature environment promotes complete oxidation of organic compounds, with the extent of dichromate reduction proportional to the chemical oxygen demand. Post-digestion samples are cooled and analyzed spectrophotometrically or by titration to determine COD values.
Features & Benefits
Item No.
- LH-TX6
Research Domain
- Analytical Chemistry
- Environmental Monitoring
- Food Science
- Industrial Hygiene
- Microbiology
- Pharmaceutical QC
Model
- LH-TX6
Environment Temperature
- 0-60â
Power Supply:
- DC 24V/12.5A
Automation Level
- semi-automated
Brand
- ConductScience
Temperature Range
- 45-180â
Accuracy
- ±0.1°C (@ 25°C)
Capacity
- 16 vials
Dimensions
- 359x195x167mm
Weight
- 4KG
Weight
- 8.82 kg
Dimensions
- L: 14.13 mm
- W: 7.68 mm
- H: 6.57 mm
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Sample Capacity | 16 vials total (8 per block) | Entry-level models typically offer 6-12 positions | Higher throughput reduces sample processing time for routine COD analysis workflows. |
| Temperature Control | Dual independent blocks with ±0.1°C accuracy | Single block systems with shared temperature control | Independent operation enables simultaneous processing of different protocols or sample types. |
| User Interface | Dual operation with touchscreen and keypad | Basic models often have simple display panels | Flexible control options provide backup functionality and user preference accommodation. |
| Temperature Range | 45-180°C programmable range | Fixed temperature models or limited ranges | Wide temperature capability supports multiple digestion protocols and method development. |
| Timing Control | 0-120 minutes programmable with alerts | Manual timing or basic countdown functions | Automated timing prevents over-digestion and improves method reproducibility. |
The LH-TX6 offers dual independent heating blocks with touchscreen control and wide temperature range. The 16-vial capacity and ±0.1°C accuracy support both routine analysis and method development applications.
Practical Tips
Verify temperature accuracy monthly using a calibrated RTD probe placed in the heating block wells.
Why: Temperature accuracy directly affects digestion completeness and COD measurement reliability.
Clean heating block wells weekly with mild detergent and inspect for corrosion or buildup.
Why: Clean thermal contact surfaces ensure uniform heat transfer and prevent sample contamination.
Allow 10-15 minutes for thermal equilibration before starting digestion cycles.
Why: Stable block temperature ensures consistent reaction kinetics across all sample positions.
Always use protective equipment when handling hot vials and concentrated acid reagents.
Why: High-temperature digestion with strong acids presents thermal and chemical hazards requiring proper protection.
Run duplicate samples and include certified reference materials in each digestion batch.
Why: Quality control samples verify method performance and identify systematic errors in COD analysis.
If temperature alarms trigger repeatedly, check for blocked ventilation or overloaded electrical circuits.
Why: Proper cooling and power supply are essential for stable temperature control and safe operation.
Record digestion parameters and completion times in laboratory notebooks for method traceability.
Why: Documentation supports method validation, troubleshooting, and regulatory compliance requirements.
Setup Guide
What’s in the Box
- LH-TX6 Desktop COD Water Reactor main unit
- DC 24V power adapter
- User manual and operating instructions
- Quick start guide (typical)
- Calibration certificate (typical)
Warranty
ConductScience provides a standard one-year manufacturer warranty covering defects in materials and workmanship, with technical support for operation and maintenance questions.
Compliance
References
Background reading relevant to this product:
What COD digestion protocols are supported by the temperature range?
The 45-180°C range supports standard EPA Method 410.4 (150°C), ISO 6060 protocols, and custom high-temperature digestion methods requiring temperatures up to 180°C.
Can I run different digestion parameters simultaneously?
Yes, the dual independent blocks allow different temperatures and timing for each 8-position block, enabling parallel processing of multiple protocols or sample types.
How do I verify temperature accuracy for method validation?
Use an independent calibrated thermometer or RTD probe in sample wells during initial setup and periodic verification to confirm ±0.1°C accuracy specification.
What vial types are compatible with the heating blocks?
Standard 16mm COD digestion vials with screw caps are compatible; consult product datasheet for specific dimensional requirements and maximum vial height.
How long does it take to reach digestion temperature?
Heat-up time depends on target temperature and ambient conditions; consult product datasheet for specific thermal performance curves and equilibration times.
Can the reactor be used for other high-temperature digestion applications?
The 45-180°C range and chemical-resistant construction support various acid digestion protocols beyond COD analysis, subject to reagent compatibility.
What maintenance is required for consistent performance?
Regular cleaning of heating blocks, periodic temperature calibration verification, and inspection of heating elements according to the maintenance schedule in the user manual.
How do I prevent cross-contamination between samples?
Use properly sealed digestion vials, clean block wells between uses, and follow standard laboratory contamination control procedures for trace analysis.
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