Eutech CON700 Conductivity Meter
| Brand | Eutech |
|---|---|
| Origin | USA |
| Model | CON700 |
| Instrument Type | Benchtop Laboratory Meter |
| Temperature Range | 0.0–100.0 °C |
| Conductivity Range | 0 µS/cm–200.0 mS/cm |
| TDS Range | 0–200 ppt (configurable via TDS factor) |
| Calibration Points | Up to 5-point manual or 4-point auto-ranging |
| Cell Constants | 0.1, 1.0, 10.0 cm⁻¹ (user-selectable) |
| Data Storage | 100 measurement records |
| Temperature Compensation | Automatic (with integrated electrode probe) or manual (0.0–100.0 °C) |
| Accuracy | ±1% of full scale (conductivity/TDS), ±0.5 °C (temperature) |
| Resolution | 0.01–1 µS/cm, 0.01–0.1 mS/cm, 0.01–0.1 ppt |
Overview
The Eutech CON700 Conductivity Meter is a benchtop laboratory-grade instrument engineered for precise, repeatable measurement of electrical conductivity, total dissolved solids (TDS), and temperature in aqueous solutions. Based on the fundamental principle of two-electrode AC conductometric measurement—where a low-frequency alternating current minimizes polarization effects—the CON700 delivers stable, drift-free readings across a broad dynamic range (0 µS/cm to 200.0 mS/cm). Its design adheres to core metrological requirements for water quality analysis, supporting standardized reporting per ASTM D1125 (Standard Test Methods for Electrical Conductivity and Resistivity of Water) and ISO 7888 (Water Quality — Determination of Electrical Conductivity). The instrument is calibrated using traceable NIST-certified KCl standards and supports configurable cell constants (0.1, 1.0, 10.0 cm⁻¹) to accommodate diverse sample matrices—from ultrapure water to concentrated brines—without hardware modification.
Key Features
- Benchtop form factor with integrated electrode stand for stable, vibration-resistant operation in regulated lab environments
- Large backlit LCD display showing simultaneous conductivity/TDS and temperature values with real-time stability indicator
- Auto-ranging across five user-selectable measurement spans (e.g., 0–200 µS/cm, 0–2 mS/cm, up to 0–200 mS/cm), eliminating manual range switching errors
- Up to five-point conductivity calibration with independent point assignment per range; supports both automatic multi-point and manual single-point protocols
- Programmable TDS conversion factor (0.4–1.0), enabling compliance with USP (Water for Injection conductivity limits) and EPA Method 120.1
- Temperature compensation algorithms compliant with linear (α = 0.00–10.00%/°C) and non-linear (NaCl-based) models, adjustable within 15.0–30.0 °C reference range
- Internal memory stores 100 timestamped measurements with temperature stamping, exportable via optional RS232 interface for audit-trail documentation
Sample Compatibility & Compliance
The CON700 is validated for use with deionized water, drinking water, wastewater effluents, process streams, and saline solutions. Its IP65-rated enclosure ensures protection against incidental splashes during routine handling. Electrode compatibility includes standard platinum blackened two-electrode cells (e.g., Eutech CDC401 series) with integrated Pt1000 temperature sensors. All measurements meet GLP data integrity requirements: each stored record includes date/time stamp, operator ID field (via manual entry), and calibration verification status. The instrument’s temperature accuracy (±0.5 °C) and conductivity reproducibility (<0.5% RSD over 24 h) align with ISO/IEC 17025 competency criteria for accredited water testing laboratories.
Software & Data Management
While the CON700 operates as a standalone meter, its RS232 serial port enables direct connection to LIMS or laboratory PCs running terminal emulation software (e.g., HyperTerminal, PuTTY) for automated data logging. Each transmitted record follows ASCII-delimited format: “CON,YYYY-MM-DD,HH:MM:SS,XXX.XX µS/cm,YY.Y °C,ZZ.Z ppt”. No proprietary drivers or cloud dependencies are required. For regulated environments, the device supports 21 CFR Part 11-compliant workflows when paired with validated third-party data acquisition software that enforces electronic signatures, audit trails, and role-based access control.
Applications
- QC/QA monitoring of purified water systems (PW, WFI) per pharmacopeial monographs (USP, EP, JP)
- Environmental compliance testing of surface water, groundwater, and wastewater discharge per EPA NPDES permit conditions
- In-process control of desalination plant feed, permeate, and brine streams
- Educational labs requiring robust, entry-level instrumentation for teaching electrochemical principles and water chemistry fundamentals
- Calibration verification of inline conductivity sensors used in bioreactor and fermentation processes
FAQ
Does the CON700 support GLP-compliant data recording?
Yes—when used with external software that implements electronic signatures, audit trails, and secure user authentication, the CON700 satisfies key GLP documentation requirements for raw data capture.
Can the instrument be used with non-Eutech electrodes?
It accepts any two-electrode conductivity cell with BNC connector and integrated Pt1000 or similar RTD sensor, provided the cell constant is manually entered and verified against certified standards.
What is the recommended calibration frequency for routine QC use?
Daily calibration is advised for high-precision applications; weekly calibration suffices for general screening when verified with a secondary check standard before each analytical batch.
Is temperature compensation mandatory during measurement?
No—manual temperature input is supported, but automatic compensation using the electrode-integrated sensor is strongly recommended to minimize operator error and ensure thermodynamic consistency.
How does the CON700 handle high-salinity samples above 100 mS/cm?
By selecting the 10.0 cm⁻¹ cell constant and the 0–200 mS/cm range, the instrument maintains linearity and resolution down to ±0.1 mS/cm at the upper limit, consistent with ISO 7888 Annex B guidance for seawater analysis.
