Conductivity Test Equipment
Portable conductivity meter measuring 10-1990 μS/cm range with ±2% accuracy for water quality analysis in laboratory and field applications.
Louise Corscadden, PhD
Neuroscience · ConductScience
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The CD-303 portable conductivity meter provides precise electrical conductivity measurements for water quality assessment across laboratory and field applications. This handheld instrument utilizes electrochemical principles to measure dissolved ion concentrations in aqueous samples, offering researchers a portable solution for routine water quality analysis.
Operating within a measurement range of 10-1990 μS/cm with ±2% F.S accuracy, the CD-303 features single-point calibration capability and an LCD digital display for clear data visualization. The instrument incorporates automatic shut-off functionality after 10 minutes of non-use to preserve battery life during extended field work. Housed in a compact 180×65×33mm form factor weighing 117g, the meter includes a protective leather case for field transport and storage.
How It Works
Conductivity measurement relies on the principle that dissolved ions in water create an electrically conductive medium. When voltage is applied between two electrodes immersed in the solution, current flows proportional to the concentration of dissolved salts and ionic species. The CD-303 utilizes electrode-based conductivity detection where the instrument applies a known voltage across the sample and measures the resulting current to calculate conductance.
The measurement principle follows Ohm's law, where conductance (G) equals current (I) divided by voltage (V). Conductivity is then calculated by normalizing conductance to the electrode geometry, expressed in microsiemens per centimeter (μS/cm). The instrument's calibration system accounts for electrode spacing and surface area to provide standardized conductivity values independent of sensor configuration.
Temperature significantly affects ionic mobility and measurement accuracy, as conductivity typically increases 2-3% per degree Celsius. The CD-303 operates within a controlled temperature range of 0-50°C to maintain measurement stability and accuracy specifications across typical environmental and laboratory conditions.
Features & Benefits
Model No.
- CD-303
Measuring range
- 10~1990µs/cm
Research Domain
- Analytical Chemistry
- Environmental Monitoring
- Food Science
- Industrial Hygiene
- Materials Science
- Pharmaceutical QC
Product name
- conductivity test equipment
Calibration
- 1 point
Working condition
- 0-50°C (32-122°F)
Automation Level
- manual
Brand
- ConductScience
Accuracy
- ±2%F·S
Power/Voltage
- 4Ã1.5V lithium batteries
Dimensions
- 180Ã65Ã33mm
Weight
- 117g
Weight
- 0.26 kg
Dimensions
- L: 7.09 mm
- W: 2.56 mm
- H: 1.3 mm
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Measurement Range | 10-1990 μS/cm | Entry-level models often offer narrower ranges or lower maximum conductivity limits | Covers the conductivity range typically encountered in freshwater environmental monitoring and basic laboratory applications. |
| Accuracy Specification | ±2% F.S | Basic handheld meters may have ±3-5% accuracy or less precise specifications | Provides reliable quantitative data suitable for quality control and regulatory reporting requirements. |
| Calibration Method | Single-point calibration | Some models require multi-point calibration procedures | Simplifies field deployment and reduces calibration time while maintaining measurement accuracy for routine applications. |
| Power Management | Auto shut-off after 10 minutes | Manual power control or shorter auto-off intervals | Extends battery life during field surveys without compromising accessibility for intermittent measurements. |
| Operating Temperature | 0-50°C (32-122°F) | Limited temperature ranges in basic models | Accommodates seasonal temperature variations in environmental sampling and laboratory storage conditions. |
The CD-303 provides essential conductivity measurement capabilities with ±2% accuracy across a 10-1990 μS/cm range suitable for freshwater and moderate salinity applications. The instrument combines single-point calibration simplicity with automatic power management for field deployment.
Practical Tips
Use fresh standard conductivity solution for each calibration session and verify the standard's temperature matches operating conditions.
Why: Solution age and temperature affect standard accuracy, directly impacting measurement precision.
Rinse the probe thoroughly with distilled water between samples and store in a clean, dry environment.
Why: Cross-contamination between samples can cause measurement drift and electrode fouling.
Allow the reading to stabilize completely before recording values, especially when transitioning between samples of different conductivity.
Why: Electrode equilibration time varies with conductivity difference and ensures accurate measurements.
Record sample temperature alongside conductivity measurements for proper data interpretation and quality control.
Why: Temperature significantly affects ionic mobility and conductivity values in water samples.
If readings appear unstable or erratic, clean the electrode more thoroughly and verify battery voltage levels.
Why: Electrode fouling or low battery power can cause measurement instability and accuracy loss.
Avoid measuring samples with extreme pH values or high concentrations of organic solvents that may damage electrodes.
Why: Aggressive chemical conditions can degrade electrode materials and compromise measurement accuracy.
Setup Guide
What’s in the Box
- CD-303 conductivity meter
- Leather carrying case
- User manual (typical)
- Battery installation guide (typical)
Warranty
ConductScience provides standard one-year manufacturer warranty coverage for the CD-303 conductivity meter with technical support for calibration and operational guidance.
Compliance
References
Background reading relevant to this product:
What is the measurement accuracy across the full conductivity range?
The CD-303 provides ±2% full-scale accuracy across the entire 10-1990 μS/cm measurement range with 10 μS/cm resolution.
How is calibration performed in field conditions?
The instrument uses single-point calibration with standard conductivity solutions, simplifying field procedures while maintaining measurement accuracy.
What temperature compensation is available?
The instrument operates reliably within 0-50°C ambient conditions; consult product datasheet for automatic temperature compensation specifications.
How long does the battery last during field use?
Four 1.5V lithium batteries provide extended operation with automatic 10-minute shut-off to conserve power; specific runtime depends on usage patterns.
Can this meter measure high-conductivity industrial samples?
The 10-1990 μS/cm range covers freshwater to moderately saline conditions; higher conductivity samples exceed the measurement range.
What maintenance is required for the electrode?
Clean the probe with distilled water between samples and store properly; electrode replacement intervals depend on usage frequency and sample types.
Is data logging or connectivity available?
This is a basic handheld meter with LCD display only; consult product specifications for data storage or communication capabilities.
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