YSI 60 Portable pH and Temperature Meter

Overview

The YSI 60 Portable pH and Temperature Meter is a field-deployable, microprocessor-controlled analytical instrument engineered for reliable, high-fidelity measurement of aqueous pH and temperature in demanding environmental monitoring applications. It operates on the principle of potentiometric pH sensing using a composite glass electrode paired with a built-in thermistor for simultaneous temperature detection. The meter employs Nernstian response calibration to convert measured electrode potential (mV) into pH units, with automatic temperature compensation (ATC) applied in real time to correct for thermal effects on electrode slope and reference junction potential. Designed specifically for freshwater, wastewater, estuarine, and groundwater fieldwork, the YSI 60 meets the operational rigors of regulatory sampling protocols under ASTM D1293 (Standard Test Method for pH of Water) and EPA Method 150.1 (pH Determination). Its ruggedized architecture supports unattended deployment in humid, dusty, or splash-prone environments—consistent with ISO/IEC 17025 laboratory field-sampling requirements.

Key Features

• Rugged, IP65-plus-rated housing with sealed BNC electrode connector and stress-relieved cable strain relief—validated for submersion up to 30 m depth with optional 30 m cable configuration
• Ergonomic handheld design with backlit, large-digit LCD display (18 mm character height) optimized for low-light or shaded field conditions
• Composite glass pH electrode with integrated temperature sensor; fully replaceable in-field without tools or recalibration interruption
• Auto-recognized 1-, 2-, or 3-point pH calibration using standard NIST-traceable buffers (pH 4.01, 7.00, 10.01)
• Automatic temperature compensation (0–75 °C) with ±0.1 °C thermistor accuracy; system-level pH accuracy ±0.1 pH (within ±10 °C of calibration temp), ±0.2 pH (within ±20 °C)
• Non-volatile memory storing up to 50 measurement records with timestamp, pH value, temperature, and calibration status—retained during battery replacement
• 6 × AA alkaline battery power supply (approx. 100 hours continuous operation); low-battery indicator and auto-power-off after 15 minutes of inactivity
• Stainless-steel probe body with polymer protective sleeve; weighted design ensures stable vertical immersion in flowing or turbulent water columns

Sample Compatibility & Compliance

The YSI 60 is validated for use with natural waters, treated effluents, surface runoff, and groundwater matrices per U.S. EPA, APHA Standard Methods (2540 H), and ISO 10523 (Water quality — Determination of pH). It complies with GLP data integrity expectations through onboard calibration logging (date, buffer IDs, slope, offset) and non-erasable memory storage. While not FDA 21 CFR Part 11–certified as a standalone device, its audit-ready calibration history and deterministic measurement traceability support compliance with ISO/IEC 17025 Clause 7.7 (Ensuring validity of results) and EU Water Framework Directive (WFD) monitoring programs. Electrode compatibility extends to moderate turbidity (<100 NTU) and conductivity ranges typical of freshwater systems (0–20 mS/cm); not recommended for highly viscous, high-suspended-solids, or strong oxidizing solutions without pre-filtration.

Software & Data Management

Data retrieval is performed manually via on-device review or by recording values directly into field notebooks or LIMS-compatible spreadsheets. The YSI 60 does not feature Bluetooth, USB, or wireless connectivity; however, its deterministic calibration log and stored readings provide full traceability for QA/QC documentation. Each stored record includes pH reading, temperature, date/time stamp (user-settable), and associated calibration parameters—enabling retrospective verification against field logs and supporting internal audit workflows. For laboratories requiring electronic data capture, integration is achieved via manual transcription validated under SOPs aligned with 21 CFR Part 11 Subpart B (Electronic Records) when paired with controlled documentation practices.

Applications

• Regulatory ambient water quality monitoring (EPA Region-specific NPDES and WQMP programs)
• Wastewater treatment plant influent/effluent pH profiling and process control verification
• Wetland and stream health assessments under USGS NWIS and state biological monitoring frameworks
• Soil porewater pH screening during ecological site characterization
• Educational field labs and undergraduate environmental science coursework
• Pre-deployment verification of pH sensor performance prior to multi-parameter sondes (e.g., YSI EXO or ProDSS platforms)

FAQ

What is the maximum cable length supported?

The YSI 60 is available with factory-terminated cables of 3 m, 7.5 m, 15 m, or 30 m—each incorporating shielded twisted-pair construction and molded stress-relief boots.
Can the pH electrode be replaced in the field?

Yes—the composite glass electrode is user-replaceable using the YSI part #131133; no recalibration is required post-replacement if the new electrode is pre-calibrated.
Does the instrument meet NIST traceability requirements?

While the meter itself is not NIST-certified, it is designed to accept NIST-traceable pH buffer standards (e.g., YSI 3821-1, 3822-1, 3823-1) and records calibration metadata essential for traceability documentation.
Is temperature compensation automatic or manual?

Temperature compensation is fully automatic and continuous; the integrated thermistor measures sample temperature in real time and dynamically adjusts the pH calculation slope.
What is the warranty coverage for the probe assembly?

The pH probe carries a 12-month limited warranty against manufacturing defects; the main instrument body is covered for 24 months from date of purchase.