YSI ProSwap Logger

Overview

The YSI ProSwap Logger is a rugged, field-deployable environmental data logger engineered for long-term, unattended monitoring of water quality and physical parameters in freshwater, estuarine, and coastal applications. Built upon YSI’s proven Pro platform architecture, it operates as a modular node within distributed sensor networks—accepting interchangeable Pro series smart sensors (e.g., optical dissolved oxygen, multi-parameter conductivity/temperature/pH/redox, turbidity, chlorophyll-a) via its standardized ProSwap connector grid. Unlike legacy loggers requiring proprietary cabling or fixed sensor configurations, the ProSwap Logger employs a true plug-and-play mechanical and electrical interface, enabling rapid sensor swaps in situ without recalibration or firmware reconfiguration. Its measurement principle relies on digital sensor interrogation via RS-485 serial communication, ensuring high signal integrity, noise immunity, and traceable sensor-specific calibration coefficients stored in each sensor’s onboard EEPROM. Designed for regulatory-grade deployments, it supports continuous logging under harsh ambient conditions—including submerged operation, freeze-thaw cycles, and high-humidity environments—while maintaining NIST-traceable data integrity.

Key Features

• Integrated rechargeable lithium-ion battery with intelligent power management, supporting up to 6 months of typical logging (15-minute interval) on a single charge
• Optional external 6×AA alkaline battery pack for mission-critical deployments where charging infrastructure is unavailable
• IP67-rated polycarbonate housing with stainless-steel mounting hardware; rated for continuous submersion at 10 m depth for 30 minutes
• Dual-mode communication: native SDI-12 output for compatibility with Campbell Scientific, Onset HOBO, and other industry-standard dataloggers; configurable Modbus RTU (RS-485) for SCADA and industrial telemetry integration
• USB-C interface for direct connection to Windows/macOS PCs running Kor software—enabling real-time configuration, firmware updates, bulk data export, and battery charging
• Onboard 16 MB flash memory with circular buffer and time-stamped event logging (including sensor disconnects, low-battery warnings, and temperature excursions)

Sample Compatibility & Compliance

The ProSwap Logger accepts all YSI Pro series smart sensors certified for environmental monitoring—including but not limited to ProODO Optical DO, ProTemp Plus, ProEC, ProTurb, ProChlorophyll, and PropH models. Each sensor is factory-calibrated per ASTM D888 (dissolved oxygen), ASTM D1253 (chlorine residual), and ISO 7888 (conductivity), with calibration certificates traceable to NIST standards. The logger itself complies with IEC 60529 (IP67), MIL-STD-810G (shock/vibration), and RoHS 3 directives. Data acquisition workflows align with EPA Method 160.1 (field instrumentation), USGS NWIS protocols, and GLP requirements—including mandatory timestamping, operator ID assignment, and immutable audit trails generated by Kor software per 21 CFR Part 11 Annex 11 guidelines.

Software & Data Management

Kor software (v3.5+) serves as the unified configuration, visualization, and compliance management platform. It provides intuitive drag-and-drop sensor mapping, interval-based scheduling, alarm threshold definition (with email/SMS notification via third-party gateways), and automated report generation in PDF/CSV/XLSX formats. All calibration events—including date, technician ID, standard used, and post-calibration verification—are embedded into the data file header. Kor enforces electronic signatures, role-based access control, and encrypted local database storage. Exported datasets include embedded sensor metadata (serial number, firmware version, calibration date), enabling full chain-of-custody documentation required for regulatory submissions to agencies such as the U.S. EPA, Environment Canada, or the EU Water Framework Directive reporting portals.

Applications

• Long-term water quality trend analysis in rivers, lakes, reservoirs, and wetlands
• Regulatory compliance monitoring for NPDES permits, TMDL implementation, and drinking water source protection programs
• Wastewater effluent and influent characterization across municipal and industrial treatment plants
• Groundwater level and chemistry monitoring in multi-level well installations
• Coastal and estuarine salinity, temperature, and dissolved oxygen profiling during seasonal hypoxia studies
• Integration into IoT-enabled watershed observatories using LoRaWAN or cellular gateways via Modbus-to-MQTT translation bridges

FAQ

Does the ProSwap Logger require a separate power supply for continuous operation?
No—it includes an integrated rechargeable battery. For deployments exceeding six months or in extreme cold (< –10 °C), the optional external 6×AA battery pack is recommended.
Can I use the ProSwap Logger with non-YSI sensors?
Only YSI Pro-series smart sensors are supported due to proprietary digital handshake protocols and embedded calibration algorithms. Third-party analog sensors are incompatible.
Is Kor software validated for 21 CFR Part 11 compliance?
Yes—Kor v3.5+ includes electronic signature capability, audit trail generation, and secure user authentication, meeting FDA requirements for electronic records in regulated environments.
How is sensor calibration data managed during field swaps?
Each Pro sensor stores its unique calibration coefficients, serial number, and expiration date in onboard memory. The ProSwap Logger reads this information automatically upon connection—no manual entry or recalibration is needed.
What happens if the logger loses power mid-deployment?
All logged data is retained in non-volatile memory. Upon power restoration, logging resumes from the last recorded timestamp without data loss or clock drift.