Leici PXSJ-226T Benchtop Ion Meter
| Brand | Leici |
|---|---|
| Model | PXSJ-226T |
| Measurement Accuracy | 0.001 class |
| mV Range | (−2000.00 to +2000.00) mV |
| mV Resolution | 0.01 mV |
| pH/pX Range | (−2.000 to 20.000) |
| pH/pX Resolution | 0.001 |
| pH/pX Accuracy | ±0.002 |
| Ion Concentration Range | 1.00 × 10⁻⁹ to 9.99 × 10⁹ (units: mol/L, mmol/L, g/L, mg/L, μg/L, ppm) |
| Temperature Range | −10.0 to 135.0 °C |
| Temperature Resolution | 0.1 °C |
| Temperature Accuracy | ±0.1 °C |
| Power Supply | AC 100–240 V input / DC 24 V output |
| Dimensions | 220 × 195 × 68 mm |
| Weight | 0.95 kg |
| IP Rating | IP54 |
| Data Storage Capacity | 1000 measurement records |
| Compliance | GLP, GMP-supporting audit trail, FDA 21 CFR Part 11-ready data management |
Overview
The Leici PXSJ-226T Benchtop Ion Meter is a high-precision electrochemical analyzer engineered for quantitative determination of specific ion activities in aqueous solutions via potentiometric measurement. It operates on the Nernst equation principle, utilizing ion-selective electrodes (ISEs) to generate stable, reproducible potentials proportional to the logarithm of target ion activity. Designed for routine quality control, environmental monitoring, pharmaceutical analysis, and academic research laboratories, the instrument delivers 0.001-class accuracy across pH, pX, ORP, and direct ion concentration measurements. Its architecture integrates dual-channel analog signal conditioning, low-noise amplification, and temperature-compensated digital conversion to ensure traceable, repeatable results under variable ambient conditions. The system supports both standardized and user-defined ion calibration protocols, enabling rigorous adherence to ISO 8655, ASTM D1293 (pH), and ISO 10523 (electrochemical ion analysis) methodologies.
Key Features
- High-resolution 7-inch color TFT touchscreen with intuitive icon-based navigation and dual-language support (English/Chinese)
- Selectable resolution modes: 0.001/0.01/0.1 pX and 0.01/0.1/1 mV; configurable temperature units (°C/°F)
- Advanced electrode diagnostics including impedance monitoring, slope evaluation, and asymmetry potential assessment for pH and ISEs
- Intelligent endpoint detection with auto-read, timed-read, interval-read, and manual-read acquisition modes
- Comprehensive calibration management: up to 6-point pH/ISE calibration; 1-point ORP calibration; built-in standard solution groups (GB, DIN, NIST, USA, MERK, JIS) and customizable buffer/ion standards
- Multi-mode ion quantification: direct concentration reading, standard addition, sample addition, and Gran plot analysis
- IP54-rated enclosure with integrated electrode stand, magnetic stirrer, tri-combination pH electrode, dust cover, and pre-packaged calibration buffers
- Firmware-upgradable architecture supporting future method expansions and regulatory compliance enhancements
Sample Compatibility & Compliance
The PXSJ-226T is validated for use with aqueous liquid samples across industrial, environmental, and life science applications—including wastewater effluent, pharmaceutical excipient solutions, food extracts, soil leachates, and clinical electrolyte preparations. It accommodates standard glass-body pH electrodes, solid-state and liquid-membrane ISEs (e.g., Na⁺, K⁺, NH₄⁺, Cl⁻, F⁻), and redox electrodes meeting DIN 19262 and IUPAC recommendations. All measurement workflows comply with Good Laboratory Practice (GLP) requirements, featuring time-stamped, user-identified records with full audit trail capability. The instrument supports GMP-aligned operation through hierarchical user permissions, password-protected configuration changes, electronic signature readiness, and 21 CFR Part 11-compatible data integrity controls—including immutable storage of calibration logs, electrode history, and measurement metadata.
Software & Data Management
Data handling conforms to modern laboratory informatics standards. Internal memory retains 1000 complete measurement sets—including raw potential values, temperature, electrode IDs, calibration parameters, and operator annotations—with export via USB mass storage or RS-232 serial interface. Optional Leici LabLink PC software enables bidirectional communication, statistical analysis (mean, SD, RSD, confidence intervals), trend visualization, and PDF/CSV report generation. U disk read/write functionality permits offline method transfer and batch result archiving. Integration with barcode scanners streamlines sample ID entry, while optional autosampler compatibility enables unattended sequential analysis—critical for high-throughput QC environments requiring ISO/IEC 17025 traceability.
Applications
- Environmental testing: Fluoride and chloride monitoring in drinking water per EPA Method 300.0 and ISO 10304-1
- Pharmaceutical manufacturing: Sodium and potassium assay in parenteral solutions per USP and EP 2.2.3
- Food & beverage QA: Ammonium quantification in dairy products and nitrate/nitrite profiling in cured meats
- Chemical process control: Real-time monitoring of ion concentrations during electroplating bath maintenance
- Academic research: Thermodynamic studies of ion-pair formation using variable-temperature pX titrations
- Soil science: Extractable cation analysis (Ca²⁺, Mg²⁺, K⁺) via ammonium acetate extraction protocols
FAQ
Does the PXSJ-226T support FDA 21 CFR Part 11 compliance?
Yes—when used with Leici LabLink software and configured with enabled audit trail, electronic signatures, and role-based access control, the system meets core Part 11 requirements for electronic records and signatures.
Can custom ion modes be saved and recalled between sessions?
Yes—up to 20 user-defined ion configurations (including selectivity coefficients, units, and calibration templates) are retained in non-volatile memory after power cycling.
Is temperature compensation automatic and electrode-specific?
Yes—the instrument applies real-time ATC using either built-in or external Pt1000 sensors, and applies Nernstian correction factors unique to each ISE type based on stored electrode specifications.
What types of printers are compatible with the RS-232 interface?
Standard ESC/P or PCL-compatible serial thermal or dot-matrix printers certified for laboratory use (e.g., Epson TM-T88 series, Star SP700) can be directly connected without driver installation.
How is data integrity ensured during power interruption?
The device implements hardware-level write protection and battery-backed RAM to preserve unsaved measurements and active calibration states during unexpected shutdowns.
