Yoke P902 Benchtop Conductivity Meter

Overview

The Yoke P902 Benchtop Conductivity Meter is a precision electrochemical instrument engineered for routine and quality-critical conductivity, TDS, resistivity, and salinity measurements in regulated laboratory environments. It operates on the principle of two-electrode or four-electrode conductometric measurement—applying an alternating current (AC) voltage across a cell with known geometry (cell constant K = 1.0 cm⁻¹) and calculating conductance from the resulting current response. Built-in automatic temperature compensation (ATC) follows the standardized nonlinear algorithm per ISO 7888 and ASTM D1125, referencing either NaCl or KCl-based calibration curves. The meter supports dual calibration series—US/EU (e.g., 84 µS/cm, 1413 µS/cm, 12.88 mS/cm) and Chinese national standards—enabling seamless compliance with regional method requirements in water analysis, pharmaceutical QC, and environmental monitoring workflows.

Key Features

• 6.5-inch high-contrast LED display with intuitive icon-driven UI, optimized for glare-free viewing under standard lab lighting conditions.
• Industrial-grade Omron tactile switches rated for ≥100,000 actuations, ensuring long-term reliability in high-frequency usage scenarios.
• GLP-compliant operation: timestamped data logging, user-defined ID entry, automatic calibration history retention, and built-in diagnostic self-checks (e.g., electrode short/open detection, battery status, sensor impedance verification).
• IP54-rated enclosure provides protection against dust ingress and water splashes—suitable for wet-bench applications without requiring additional splash guards.
• Auto-ranging conductivity measurement across five overlapping segments (0.00–20.00 µS/cm to 20.0–200.0 mS/cm), eliminating manual range selection errors and reducing operator training burden.
• Optional Bluetooth 5.0 module enables wireless data streaming to Windows/macOS PCs or Android/iOS mobile devices via Yoke’s certified companion application—supporting real-time graphing, remote configuration, and over-the-air firmware updates.

Sample Compatibility & Compliance

The P902 is validated for aqueous samples with conductivity values spanning ultrapure water (≥18.2 MΩ·cm) to concentrated brines (≤200 mS/cm). Its K = 1.0 cell design ensures optimal sensitivity in mid-range applications (e.g., drinking water, boiler feedwater, buffer solutions), while maintaining linearity across full scale via polynomial TDS and salinity conversion algorithms aligned with USP , ISO 7888:2019, and EPA Method 120.1. All stored data include mandatory metadata: date/time stamp, operator ID, electrode serial number, calibration status, ambient temperature, and measurement mode—fully traceable for internal audits or regulatory submissions. The device meets CE marking requirements (EMC Directive 2014/30/EU, LVD Directive 2014/35/EU) and conforms to RoHS 2011/65/EU material restrictions.

Software & Data Management

Internal memory retains up to 2000 measurement records with full parameter sets. Data export is supported via micro-USB to FAT32-formatted USB flash drives; exported .CSV files are natively readable in Microsoft Excel, LibreOffice Calc, and LIMS-compatible platforms. No proprietary software installation is required. When equipped with Bluetooth, the P902 transmits timestamped datasets directly to cloud-synced spreadsheets or local databases using configurable interval triggers (e.g., every 15 seconds during stability testing). Audit trail functionality complies with FDA 21 CFR Part 11 principles—supporting electronic signatures, immutable record timestamps, and role-based access control when integrated into validated IT infrastructure.

Applications

• Pharmaceutical water system validation (PW, WFI, Purified Water per USP and EU Ph. Eur. 2.2.38)
• Environmental monitoring of surface water, groundwater, and wastewater effluent (ISO 5667-16, APHA 2510B)
• Food & beverage process control (dairy conductivity, brewing wort analysis, desalination brine management)
• Academic teaching labs for fundamental electrochemistry experiments (Kohlrausch’s law, ion mobility studies)
• QC/QA of cleaning agents, disinfectants, and reagent-grade solvents

FAQ

Does the P902 support multi-point conductivity calibration?
No—it performs single-point calibration using a single standard solution, enabled by its fixed-cell-constant (K = 1.0 cm⁻¹) electrode and adaptive gain algorithm that maintains ±1.5% FS accuracy across the entire 0.5 µS/cm–200 mS/cm span.
Can the instrument store calibration data separately from measurement records?
Yes—calibration events (date, standard used, slope, offset, cell constant) are archived independently and linked to subsequent measurements via unique session IDs.
Is the Bluetooth module factory-installed or field-upgradable?
The Bluetooth 5.0 module is an optional factory-configured hardware variant (model suffix “-BT”); it cannot be retrofitted post-purchase due to antenna integration and firmware binding requirements.
What is the recommended recalibration frequency under GLP conditions?
Per Yoke’s validation guide, daily verification with a check standard is advised; full recalibration is required after electrode replacement, physical impact, or if drift exceeds ±2% of reading during verification.
Does the P902 meet ISO/IEC 17025 traceability requirements?
Yes—when used with NIST-traceable conductivity standards (e.g., NIST SRM 3194) and documented calibration procedures, the P902 supports metrological traceability chains compliant with ISO/IEC 17025:2017 clause 6.4.