COD Measurement Instrument
Portable colorimetric analyzer for simultaneous measurement of COD, total phosphorus, and ammonia nitrogen in water samples across multiple concentration ranges.
Louise Corscadden, PhD
Director of Science · ConductScience
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Key Specifications
Full details →- Model fit
- Configured during quote
- SKU family
- CS-LH-C3
- Sizing
- 8.8 x 7.3 x 5.9 cm
- Ordering
- Online checkout and quote request available
- Category
- COD & BOD Testing
- Build notes
- Confirm accessories, station layout, and support needs before purchase
The COD Measurement Instrument (Model LH-C3) is a portable colorimetric analyzer designed for quantitative determination of chemical oxygen demand, total phosphorus, and ammonia nitrogen in aqueous samples. This multi-parameter instrument utilizes segmented measurement ranges to accommodate diverse sample concentrations, from trace-level environmental monitoring to high-concentration industrial effluent analysis.
The instrument employs colorimetric detection principles with pre-programmed analytical protocols for each parameter. Sample preparation involves standard digestion procedures followed by optical measurement at parameter-specific wavelengths. The device features an integrated display system with alphanumeric codes for measurement status, concentration readouts, and diagnostic information including temperature compensation and range verification.
How It Works
Features & Benefits
Model
- LH-C3
Code
- Meanings
C11
- Means COD 0-150mg/L test item
C12
- Means COD 100-1500mg/L test item
C13
- Means COD 1000-15000mg/L test item
L22
- Means Total phosphorus 0-2mg/L test item
L23
- Means Total phosphorus 2-20mg/L test item
A55
- Means Ammonia nitrogen 0-5mg/L test item
A56
- Means Ammonia nitrogen 2-50mg/L test item
idLE
- Means the meter is on standby mode
XXXX
- Means the concentration of the tested solution
HHHH
- Means the concentration of tested solution is higher than the test range
LLLL
- Means the concentration of tested solution is lower than the test range
rESt
- Means have not zero setting before testing
XX.Xâ
- Means temperature
Automation Level
- semi-automated
Brand
- ConductScience
Research Domain
- Analytical Chemistry
- Environmental Monitoring
- Food Science
- Industrial Hygiene
- Microbiology
- Pharmaceutical QC
Weight
- 0.26 kg
Dimensions
- L: 8.8 mm
- W: 7.3 mm
- H: 5.9 mm
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Parameter Coverage | Three parameters (COD, Total Phosphorus, Ammonia Nitrogen) in one instrument | Single-parameter instruments require separate analyzers for each measurement | Reduces equipment costs and setup complexity for comprehensive water quality assessment. |
| COD Measurement Range | Three segmented ranges: 0-150, 100-1500, and 1000-15000 mg/L | Fixed ranges often require manual dilution for high-concentration samples | Accommodates samples from pristine waters to industrial effluents without dilution calculations. |
| Diagnostic Display | Alphanumeric codes for status (idLE, XXXX, HHHH, LLLL, rESt) and temperature display | Basic numeric displays with limited diagnostic information | Provides clear operational guidance and troubleshooting information to ensure measurement validity. |
| Portable Operation | Battery-powered for field measurements | Varies by model - some require AC power or have limited battery life | Enables on-site analysis at remote sampling locations without power infrastructure. |
| Range Selection | User-selectable concentration ranges with dedicated codes (C11/C12/C13, L22/L23, A55/A56) | Auto-ranging systems may sacrifice precision or require complex calibration | Optimizes measurement precision through range-specific calibration curves and algorithms. |
The LH-C3 offers multi-parameter capability with segmented concentration ranges and comprehensive diagnostic feedback. The instrument's portable design and range-specific optimization provide versatility for both laboratory and field applications across diverse sample types.
Practical Tips
Perform zero calibration with the same reagent batch and reaction conditions used for samples to account for reagent blank contributions.
Why: Reagent blanks can vary between lots and significantly impact low-concentration measurements.
Allow samples and reagents to equilibrate to the same temperature before measurement to minimize thermal effects.
Why: Temperature differences can cause optical interference and affect colorimetric reaction kinetics.
If readings consistently show HHHH or LLLL, verify sample concentration range and consider switching to appropriate measurement codes.
Why: Using the correct concentration range ensures optimal precision and prevents measurement errors.
Clean sample chamber and optical surfaces with appropriate solvents after each use, especially when switching between parameters.
Why: Residual reagents can cause cross-contamination and optical interference in subsequent measurements.
Run duplicate analyses and blank samples with each batch to verify measurement consistency and detect contamination.
Why: Quality control samples identify systematic errors and ensure data reliability for regulatory reporting.
Handle COD reagents in a well-ventilated area and follow proper disposal protocols for chromium-containing waste.
Why: COD analysis involves strong acids and hexavalent chromium compounds that require appropriate safety precautions.
Setup Guide
What’s in the Box
- COD Measurement Instrument (Model LH-C3)
- Power adapter and cables (typical)
- Sample vials and caps (typical)
- Reagent starter kit (typical)
- User manual and quick reference guide (typical)
- Calibration verification standards (typical)
Warranty
ConductScience provides a standard one-year manufacturer warranty covering defects in materials and workmanship, with technical support for operational questions and method development assistance.
Compliance
References
Background reading relevant to this product:
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