Leici PHSJ-5T Benchtop pH Meter

Overview

The Leici PHSJ-5T is a high-precision benchtop pH meter engineered for rigorous laboratory environments where trace-level accuracy, regulatory compliance, and operational repeatability are non-negotiable. Designed around a potentiometric measurement principle—utilizing the Nernst equation to quantify hydrogen ion activity—the instrument delivers stable, reproducible readings across an extended pH range of −2.000 to 20.000. Its 0.001-pH resolution and ±0.002-pH electronic unit accuracy meet ISO 8655-4 and ASTM E70 specifications for high-grade electrochemical instrumentation. The PHSJ-5T operates as a multi-parameter platform, concurrently measuring pH, mV (ORP), and temperature with automatic temperature compensation (ATC) using integrated Pt1000 or NTC thermistors. Its architecture supports both routine QC workflows and method-critical applications in pharmaceutical development, environmental monitoring, food safety testing, and academic research laboratories.

Key Features

• 7-inch HD color capacitive touchscreen with intuitive icon-driven navigation and dual-language support (English & Chinese)
• 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—including slope evaluation, asymmetry potential assessment, and response time analysis—to ensure sensor integrity prior to calibration or measurement
• Multi-standard buffer recognition: auto-identifies GB, DIN, NIST, USA, MERK, and JIS buffer sets; supports up to six custom-defined buffer groups with user-editable pH values and temperatures
• Intelligent endpoint detection: configurable algorithms for auto-read, timed-read, interval-read, or manual capture—optimized for viscous, low-conductivity, or unstable samples
• Robust data governance: built-in password-protected user roles (Admin, Operator, Viewer), audit-trail logging, and full GLP/GMP traceability including operator ID, timestamp, electrode ID, calibration history, and environmental conditions
• IP54-rated enclosure for dust resistance and limited water splashing protection—suitable for shared lab benches and controlled production areas

Sample Compatibility & Compliance

The PHSJ-5T accommodates standard 12-mm diameter glass-body combination pH electrodes (e.g., Leici E-201F, PH-301) and ORP electrodes with BNC or DIN connectors. It supports aqueous, semi-aqueous, and low-ionic-strength samples—including cell culture media, purified water (PW), WFI, and buffer solutions used in biopharmaceutical manufacturing. All calibration and measurement data adhere to Good Laboratory Practice (GLP) and Good Manufacturing Practice (GMP) frameworks. Electronic records comply with FDA 21 CFR Part 11 requirements when paired with validated PC software and access-controlled network deployment. The system maintains full audit trails for calibration events, measurement sessions, user logins, configuration changes, and data exports—ensuring complete data lineage for regulatory inspections.

Software & Data Management

• Onboard storage for ≥1,000 complete measurement records—including raw mV, pH, temperature, electrode ID, calibration coefficients, and operator metadata
• Data export via USB flash drive (FAT32 formatted) in CSV or PDF report formats; direct printing via RS-232 to ESC/P-compatible thermal or dot-matrix printers
• PC connectivity via USB virtual COM port using Leici LabLink Pro software—enabling real-time data streaming, remote control, method synchronization, and LIMS integration through HL7 or ASTM E1384-compliant protocols
• Batch processing support: compatible with Leici AS-500 series autosamplers for unattended sequential analysis of up to 96 samples per run
• GMP operation logs include timestamps, digital signatures, reason-for-change fields, and immutable record locking—fully aligned with Annex 11 and ICH GCP guidelines

Applications

The PHSJ-5T serves critical functions across regulated and research-intensive domains. In pharmaceutical QA/QC labs, it verifies pH of injectables, ophthalmic solutions, and dissolution media per USP and EP 2.2.3. In environmental testing, it measures pH in wastewater effluents, soil extracts, and acid rain simulants under EPA Method 150.1. Food & beverage labs use it for titratable acidity validation in dairy, juice, and fermented products per AOAC 973.41. Academic users leverage its open communication protocol and scriptable interface for method development in electrochemistry education and corrosion studies. Its extended alkaline range (up to pH 20.000) also enables specialized applications in cement pore solution analysis and high-pH catalyst characterization.

FAQ

What calibration standards does the PHSJ-5T support?
It natively recognizes six international buffer standards (NIST, DIN, GB, etc.) and allows creation of up to six user-defined buffer groups with programmable pH and temperature values.

Does the instrument support FDA 21 CFR Part 11 compliance?
Yes—when deployed with Leici LabLink Pro v3.2+ and configured with role-based authentication, electronic signatures, and audit-trail archiving, it meets core Part 11 requirements for electronic records and signatures.

Can the PHSJ-5T connect to a LIMS system?
Yes—via USB-to-PC link using ASTM E1384-compliant ASCII output or HL7 messaging through Leici’s certified middleware drivers.

What is the maximum number of calibration points supported for pH electrodes?
Up to six-point pH calibration with slope and offset verification; one-point ORP calibration with reference potential entry.

Is temperature measurement integrated or external?
Integrated ATC via built-in Pt1000 sensor (±0.1 °C accuracy); optional external temperature probe input (DIN connector) available for immersion or surface measurements.