Leici PHBJ-261L Portable pH Meter

Overview

The Leici PHBJ-261L Portable pH Meter is an advanced electrochemical analyzer engineered for high-precision field and laboratory pH, mV, and temperature measurements. Based on potentiometric measurement principles—where the potential difference between a glass pH sensing electrode and a reference electrode is converted into a pH value via the Nernst equation—the instrument delivers metrological-grade performance in a rugged, handheld form factor. Designed for demanding applications across environmental monitoring, wastewater treatment, food safety inspection, pharmaceutical QC, and academic research, the PHBJ-261L meets the functional and regulatory expectations of modern quality control workflows. Its 0.001-pH resolution and ±0.002-pH accuracy align with ISO 3696 (Grade 2 water), ASTM D1293 (pH of water), and USP requirements for analytical instrumentation used in regulated environments.

Key Features

• High-resolution 4.3-inch color TFT touchscreen with intuitive icon-based navigation and dual-language UI (English & Chinese)
• Selectable resolution modes: pH (0.001 / 0.01 / 0.1), mV (0.01 / 0.1 / 1), and temperature (0.1 °C/°F)
• Intelligent endpoint detection with multiple reading modes: auto-hold, timed reading, interval logging, and manual capture
• Comprehensive calibration management supporting up to eight-point pH calibration and one-point ORP calibration
• Automatic buffer recognition for six international standard sets (GB, DIN, NIST, USA, MERCK, JIS) plus user-defined buffer groups
• IP65-rated enclosure ensuring dust-tight operation and protection against low-pressure water jets—suitable for outdoor and industrial site use
• Integrated Bluetooth 5.0 and USB-C interface enabling wireless data streaming to tablets, laptops, or LIMS systems, as well as direct U-disk read/write capability
• GLP-compliant data architecture with timestamped records, operator authentication, electrode ID tracking, and full audit trail export
• Rechargeable lithium-ion battery providing >20 hours of continuous operation; supports charging via PC, power bank, or included AC adapter

Sample Compatibility & Compliance

The PHBJ-261L is optimized for aqueous and semi-aqueous samples across diverse matrices—including drinking water, surface runoff, fermentation broths, cleaning solutions, and buffer preparations. Its triple-junction composite pH electrode (included) minimizes liquid junction potential drift and resists clogging in turbid or low-ionic-strength samples. The instrument conforms to IEC 61010-1 for electrical safety and EN 61326-1 for electromagnetic compatibility. All stored measurement data comply with GLP documentation standards, including mandatory fields: date/time, sample ID, electrode serial number, calibration status, ambient temperature, and user login credentials. Full traceability supports FDA 21 CFR Part 11 readiness when paired with validated software protocols.

Software & Data Management

Data handling is governed by a secure, hierarchical user management system supporting role-based access control (RBAC) with three permission tiers: Administrator, Supervisor, and Operator. Each dataset includes metadata such as calibration history, electrode condition flags, and environmental compensation logs. Up to 1000 pH, 1000 mV, and 1000 temperature records are retained locally with sorting, statistical analysis (mean, SD, min/max), and CSV export functionality. Communication with desktop PCs uses Leici’s certified LabLink Pro software (Windows/macOS), which enables batch report generation, trend charting, and integration into enterprise QA/QC databases. Bluetooth pairing allows real-time transmission to mobile devices running custom MDM applications compliant with ISO/IEC 17025 internal audit requirements.

Applications

• Field-based environmental assessment: stream pH profiling, soil leachate analysis, acid mine drainage monitoring
• Pharmaceutical manufacturing: purified water system verification, cleaning validation rinse testing, excipient solution checks
• Food & beverage QA: titratable acidity screening, brine pH control, fermentation pH trending
• Academic teaching labs: electrochemistry experiments, calibration curve development, Nernst equation validation
• Wastewater treatment plants: influent/effluent pH compliance reporting per EPA Method 150.1
• Calibration laboratories: transfer standard verification and inter-laboratory comparison exercises

FAQ

What calibration standards does the PHBJ-261L recognize automatically?
The meter auto-identifies six internationally recognized buffer series (GB, DIN, NIST, USA, MERCK, JIS) and permits creation of custom buffer groups with user-defined pH/mV values and temperatures.
Is the instrument suitable for non-aqueous samples?
It is designed primarily for aqueous solutions. For non-aqueous or low-conductivity media, optional electrodes with specialized junctions and filling solutions are recommended—and must be selected based on solvent compatibility per manufacturer guidelines.
How is data integrity ensured during transfer to external systems?
All exported files include digital signatures, checksum validation, and embedded metadata. When used with LabLink Pro under configured network policies, transfers meet ALCOA+ (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) principles.
Does the device support temperature compensation for non-standard electrodes?
Yes—manual temperature entry and automatic ATC (via built-in thermistor or external Pt100 probe) are both supported, allowing compensation algorithms to adjust for electrode-specific thermal response characteristics.
Can the firmware be updated in the field?
Firmware upgrades are delivered via USB drive or Bluetooth using signed binary packages verified through embedded cryptographic keys—ensuring version control and preventing unauthorized modifications.