Leici PHBJ-261L Portable pH Meter

Overview

The Leici PHBJ-261L Portable pH Meter is a high-precision, multi-parameter electrochemical analyzer engineered for field-deployable and laboratory-grade pH, mV, and temperature measurements. Based on potentiometric measurement principles—where the electromotive force generated at the interface between a pH-sensitive glass electrode and reference electrode is converted into a digital pH value—the instrument delivers metrological reliability aligned with ISO 8655 and IUPAC guidelines for pH metrology. Designed for rigorous environmental monitoring, water quality assessment, food safety verification, pharmaceutical process control, and academic research, the PHBJ-261L meets the functional and regulatory expectations of GLP-compliant workflows. Its compact form factor, robust mechanical architecture, and sealed housing (IP65-rated) ensure operational integrity in humid, dusty, or intermittently wet environments—including wastewater treatment plants, agricultural field sites, and bioprocessing cleanrooms.

Key Features

• High-resolution 4.3-inch color TFT touchscreen with adjustable backlight and intuitive icon-driven navigation supporting both English and Chinese UI languages
• Selectable resolution modes: pH (0.001 / 0.01 / 0.1), mV (0.01 / 0.1 / 1), and temperature (0.1 °C / 0.1 °F)
• Advanced electrode diagnostics and automatic endpoint detection using dynamic slope analysis—enabling auto-read, timed-read, interval-read, and manual sampling protocols
• Comprehensive calibration flexibility: up to 8-point pH calibration and 1-point ORP calibration; auto-recognition of six internationally standardized buffer sets (GB, DIN, NIST, USA, MERCK, JIS); support for user-defined buffer formulations and custom buffer group management
• Integrated temperature compensation with dual-mode selection (manual or automatic) and wide-range sensor compatibility (−10.0 to 135.0 °C)
• Onboard intelligent system architecture featuring method templates, electrode lifecycle tracking, user role-based access control (admin/operator/guest), password-protected settings, and factory reset with diagnostic self-test on power-up
• Dual power operation: long-life rechargeable lithium-ion battery (with low-voltage warning and real-time charging status indicator) + universal AC/DC adapter (100–240 V AC input, 5 V DC output)

Sample Compatibility & Compliance

The PHBJ-261L is optimized for aqueous and semi-aqueous samples across diverse matrices—including drinking water, surface runoff, industrial effluents, fermentation broths, dairy products, and buffer solutions. It interfaces seamlessly with standard tri-combination pH electrodes (included), eliminating the need for separate reference and measuring elements. The instrument conforms to international electrochemical measurement standards, including ISO 7888 (water quality—pH determination), ASTM D1293 (standard test method for pH of water), and USP (pH measurement in pharmaceutical preparations). Its data handling architecture supports audit-ready GLP documentation, with timestamped entries, operator ID logging, calibration history traceability, and electronic signature readiness—facilitating alignment with FDA 21 CFR Part 11 requirements when integrated with validated LIMS platforms.

Software & Data Management

Data integrity and workflow integration are central to the PHBJ-261L’s design. It stores up to 1,000 complete measurement records per parameter type (pH/mV/temperature), each containing sample ID, electrode serial number, calibration date, ambient temperature, and user annotation fields. Stored datasets can be reviewed chronologically, filtered by date range or electrode ID, and visualized as time-series curves directly on-device. Export options include USB mass storage mode (compatible with FAT32-formatted drives), Bluetooth 4.2 wireless transmission to paired tablets or PCs, and wired connectivity via micro-USB to Leici’s certified PC communication software. The software enables CSV export, statistical summary (mean, SD, RSD, min/max), trend analysis, and direct import into LIMS or ELN systems. All data transfers preserve metadata integrity and maintain immutable audit trails.

Applications

• Environmental field testing: real-time pH profiling of rivers, lakes, groundwater wells, and stormwater outfalls
• Food & beverage QC: acidity verification in juices, dairy, fermented foods, and canned goods per Codex Alimentarius and HACCP protocols
• Pharmaceutical manufacturing: in-process pH checks during buffer preparation, cell culture media adjustment, and cleaning validation
• Academic teaching labs: student training in electrochemical fundamentals, calibration theory, and uncertainty estimation
• Industrial process support: boiler feedwater monitoring, electroplating bath control, and wastewater neutralization optimization

FAQ

What calibration standards does the PHBJ-261L recognize automatically?

The meter auto-identifies six predefined buffer groups: GB (Chinese national standard), DIN (German Institute for Standardization), NIST (U.S. National Institute of Standards and Technology), USA (American standard mix), MERCK (Merck KGaA reference set), and JIS (Japanese Industrial Standards). Users may also define custom buffers and save them as named groups.
Does the instrument support regulatory-compliant data archiving?

Yes—data records include embedded timestamps, operator IDs, electrode identification, calibration verification logs, and change history. When used with validated software and documented procedures, the system supports GLP, GMP, and 21 CFR Part 11 compliance objectives.
Can the PHBJ-261L operate continuously while charging?

Yes. The device functions normally during charging via the included AC adapter or compatible 5 V USB power source, enabling uninterrupted field use during extended deployments.
Is the included electrode suitable for non-aqueous or high-viscosity samples?

The supplied tri-combination electrode is optimized for aqueous solutions. For organic solvents, low-ionic-strength samples, or viscous media (e.g., syrups, gels), optional specialized electrodes—including double-junction, gel-filled, or sleeve-type reference configurations—are recommended and fully compatible.
How is firmware updated?

Firmware upgrades are performed via USB flash drive using Leici’s official update package. The process preserves all user-configured methods and stored data, and includes built-in checksum verification to ensure integrity.