ChemTron SSX 210 Portable Salinity Meter Kit

Overview

The ChemTron SSX 210 Portable Salinity Meter Kit is a field-deployable, battery-operated electrochemical instrument engineered for rapid, reliable determination of practical salinity (PSU) in aqueous solutions. It operates on the principle of electrical conductivity measurement—calculated from the solution’s conductance and temperature-compensated using an integrated NTC thermistor—and converts the result to salinity via the UNESCO 1983 algorithm (PSS-78), which is traceable to internationally accepted oceanographic standards. Designed for use in marine ecology studies, aquaculture monitoring, coastal water quality assessment, and routine process control in desalination or wastewater treatment facilities, the SSX 210 delivers stable readings without requiring calibration buffers for basic screening applications—though two-point calibration (e.g., using 0 PSU DI water and 35 PSU standard seawater) is supported for higher metrological rigor.

Key Features

• Gold-plated dual-conductor electrode probe ensures long-term corrosion resistance and stable signal integrity in high-chloride environments, including seawater, brines, and estuarine samples.
• Integrated temperature sensor (NTC type) enables real-time automatic temperature compensation (ATC) across the full operational range (+10 °C to +40 °C), eliminating manual correction errors.
• Adjustable measurement interval (1–15 seconds) allows optimization between response speed and power conservation—particularly valuable during extended field surveys.
• Auto-off function deactivates the unit after 5 minutes of inactivity, extending battery service life to up to five years under typical intermittent-use conditions.
• Rugged ABS housing with IP54 ingress protection resists dust and low-pressure water spray, making it suitable for outdoor deployment in humid or splash-prone environments.
• Compact ergonomic design (100 × 46 × 25 mm) and lightweight construction (~200 g) facilitate one-handed operation and seamless integration into mobile sampling kits.

Sample Compatibility & Compliance

The SSX 210 is validated for direct immersion measurements in natural waters (seawater, brackish water, freshwater), aquaculture effluents, and industrial process streams with total dissolved solids (TDS) concentrations corresponding to 0–100 PSU. It complies with IEC 60529 for IP54-rated enclosures and meets general requirements for portable electrochemical meters outlined in ASTM D1125–22 (Standard Test Methods for Electrical Conductivity and Resistivity of Water). While not certified for GLP or GMP-regulated environments out-of-the-box, its stable zero point, documented repeatability (±1 PSU), and traceable measurement principle support use in ISO/IEC 17025-accredited laboratories when operated within defined SOPs and accompanied by periodic verification using NIST-traceable salinity standards.

Software & Data Management

The SSX 210 operates as a standalone instrument with no embedded memory or Bluetooth/Wi-Fi connectivity. All measurements are displayed in real time on a high-contrast LCD screen and must be manually recorded. However, its consistent output format (integer PSU value + temperature reading) facilitates structured logging in external digital notebooks or LIMS-compatible spreadsheets. For audit readiness, users may implement procedural controls—including operator ID annotation, environmental condition logging (ambient temperature/humidity), and timestamped calibration records—in alignment with FDA 21 CFR Part 11 principles where electronic records are generated downstream.

Applications

• Marine and estuarine field surveys requiring rapid salinity profiling at multiple stations.
• Monitoring salinity drift in recirculating aquaculture systems (RAS) and hatchery tanks.
• Verifying brine concentration in chlor-alkali or food preservation processes.
• Educational laboratory exercises demonstrating conductivity–salinity relationships and temperature compensation effects.
• Pre-screening of ballast water compliance per IMO Ballast Water Management Convention (D-2 standard).
• Calibration verification of fixed-installation conductivity sensors in coastal monitoring buoys.

FAQ

Does the SSX 210 require regular calibration?
Yes—while factory-calibrated, periodic verification against certified reference standards (e.g., 0 PSU DI water and 35 PSU seawater standard) is recommended before critical measurements or after prolonged storage.
Can the probe be used in highly viscous or suspended-solids-rich samples?
No—the gold-plated probe is optimized for low-turbidity aqueous media; particulate fouling or viscosity >20 cP may impair electrode contact and measurement reproducibility.
Is the CR2477 battery user-replaceable?
Yes—battery replacement requires a precision Phillips #0 screwdriver and follows instructions in the included technical manual; no soldering or special tools are needed.
What does the “1 PSU” resolution mean in practice?
It indicates the smallest detectable change in displayed salinity value; actual measurement uncertainty remains ±1 PSU (k = 2), encompassing contributions from probe stability, temperature sensor tolerance, and algorithmic conversion variance.
Is the IP54 rating sufficient for rain exposure during fieldwork?
Yes—IP54 provides protection against vertically falling droplets and limited ingress of dust; however, submersion or high-pressure washing is strictly prohibited.