Overview
The YSI Model 33 S-C-T is a handheld water quality meter designed for portable field measurement of conductivity, salinity, temperature, and total dissolved solids (TDS). This discontinued model remains a practical choice for environmental monitoring, aquaculture, and laboratory applications requiring quick, accurate water analysis. The compact design and straightforward measurement modes make it suitable for technicians and engineers working with surface water, wastewater, and industrial process water.
Key Features
- Measures conductivity, salinity, temperature, and TDS in a single instrument
- Handheld, portable design ideal for field sampling and point-of-use measurement
- Single-probe sensor for multi-parameter readings
- Built-in probe storage chamber to protect electrodes when not in use
- Manual calibration capability with NIST-traceable calibrator solutions
- Operating range suitable for freshwater, brackish, and saltwater environments
Technical Specifications
Measurement Ranges:
- Conductivity: 0–200 mS/cm (microSiemens and milliSiemens displays)
- Salinity: 0–80 parts per thousand (ppt)
- Temperature: −5°C to +65°C (with field-switchable °F option)
- TDS: Calculated from conductivity and temperature
Sensor and Construction:
- Integrated conductivity cell with user-adjustable cell constant (K)
- Waterproof case (IP65 rating)
- Built-in probe storage chamber
- Compact handheld form factor
Power and Battery Life:
- Powered by six AA-size alkaline batteries
- Approximately 100 hours of continuous operation per battery set
- Battery depletion indicator (“LO BAT” message)
Calibration and Display:
- Manual calibration using NIST-traceable solutions
- LCD display with simultaneous temperature readout
- Mode switching between conductivity, specific conductance, salinity, and TDS
Typical Applications
- Environmental water quality monitoring and compliance testing
- Aquaculture and fishery management
- Wastewater treatment and industrial process control
- Saltwater and brackish water analysis
- Laboratory and field research in hydrology and limnology
- Irrigation and agricultural water assessment
- Municipal and potable water quality screening
Compatibility & Replacements
Compatible With
- NIST-traceable calibration solutions (standard reagents)
- Freshwater, saltwater, and brackish water environments
- Laboratory benchtop and portable field configurations
- Handheld data collection workflows without data logging capabilities
Replaces / Drop-In Replacement For
The YSI Model 33 S-C-T is a discontinued product. Verify compatibility with your system integrator before ordering. No direct drop-in replacements with identical feature sets are available; however, equivalent modern alternatives exist in YSI’s current product lineup.
Works With
- Standard conductivity probes with YSI connector compatibility
- Manual calibration protocols (no software interface required)
- Standalone field measurement without data logging or networked integration
- Field service and water quality testing workflows
