Leici PXSJ-227L Benchtop Multi-Ion Analyzer

Overview

The Leici PXSJ-227L Benchtop Multi-Ion Analyzer is a high-precision potentiometric measurement system engineered for quantitative ion activity and concentration analysis in environmental, industrial, pharmaceutical, and academic laboratories. It operates on the fundamental principle of ion-selective electrode (ISE) potentiometry—measuring the potential difference between a reference electrode and an ion-selective membrane electrode under controlled temperature conditions. This thermodynamically grounded method enables direct quantification of target ions—including F⁻, Cl⁻, NO₃⁻, Na⁺, K⁺, Ca²⁺, NH₄⁺, Ag⁺, Cu²⁺, Pb²⁺, and others—across nine orders of magnitude (10⁻⁹ to 10⁹) with four-digit significant-figure resolution. The instrument integrates dual-mode operation: classical electrometric measurement (mV, pH, ORP) and advanced ion-concentration calculation using multiple validated protocols—direct reading, standard addition, sample addition, and Gran plot analysis—ensuring traceability and method flexibility per ISO 10523, ASTM D1293, and USP .

Key Features

• 7-inch high-resolution color TFT touchscreen with intuitive graphical interface supporting both English and Chinese languages
• Four independent measurement channels; modular pX measurement units enable hot-swap configuration (1–4 modules)
• Automatic electrode recognition and plug-and-play compatibility with Leici-certified ISEs and combination electrodes
• Comprehensive temperature compensation: built-in Pt1000 sensor with range from −10.0 to 135.0 °C and ±0.3 °C accuracy within physiological and regulatory-relevant bands
• Intelligent endpoint detection algorithms: supports auto-read, timed-read, interval-read, and manual capture modes with configurable stability criteria
• IP54-rated enclosure for dust and splash resistance in routine lab environments
• Firmware-upgradable architecture enabling future protocol expansion, regulatory alignment updates, and custom method deployment
• Three-tier user permission system (Administrator, Supervisor, Operator) with password protection and role-based access control

Sample Compatibility & Compliance

The PXSJ-227L accommodates aqueous liquid samples across diverse matrices—including drinking water, wastewater, soil extracts, biological fluids, and process streams—provided they fall within specified ionic strength and redox stability limits for ISE operation. It complies with Good Laboratory Practice (GLP) requirements through mandatory electronic signatures, time-stamped audit trails, and immutable data logging. All calibration, verification, and measurement events are timestamped and attributable to individual users. The system supports full traceability per ISO/IEC 17025:2017 clause 7.7 and aligns with FDA 21 CFR Part 11 when paired with Leici’s validated PC software (Leici LabLink Pro v4.x), which enforces electronic record integrity, signature authentication, and audit log retention. pH buffer recognition covers GB, DIN, NIST, USA, MERK, and JIS standards—ensuring global metrological consistency.

Software & Data Management

Data integrity and interoperability are central to the PXSJ-227L’s design. Internal memory stores up to 1000 measurement records per parameter type (pH, ORP, pX, ion concentration), 100 calibration histories, and 1000 pH standard verification entries—all searchable by date, sample ID, operator, or method. Export options include CSV (for Excel/SPSS), PDF (print-ready reports), and UVC-compatible USB flash drive transfer. RS-232 output enables direct connection to serial printers with configurable report templates. USB host functionality allows integration with LIMS via Leici’s OPC UA–enabled communication driver. Optional barcode scanning support streamlines sample ID entry and reduces transcription errors. All data exports retain embedded metadata: timestamps, electrode IDs, calibration status, temperature, and operator credentials—enabling full forensic reconstruction during regulatory inspections.

Applications

• Environmental monitoring: Fluoride in groundwater (per WHO guideline values), nitrate in agricultural runoff, chloride in coastal aquifers
• Pharmaceutical QC: Sodium and potassium content in parenteral solutions per USP and EP 2.2.16
• Food & beverage: Sodium in processed foods, ammonium in fermentation broths, calcium in dairy products
• Academic research: Ion transport kinetics, membrane selectivity studies, speciation modeling validation
• Industrial process control: Electroplating bath monitoring (Cu²⁺, Ni²⁺), desalination brine analysis (Cl⁻, SO₄²⁻)

FAQ

Does the PXSJ-227L support GLP-compliant data archiving?

Yes—the instrument generates time-stamped, user-attributed, tamper-evident records with full audit trail capability. Calibration logs, verification results, and measurements are stored with metadata required for ISO/IEC 17025 and FDA audits.
Can it perform Gran plot analysis for weakly dissociated ions?

Yes—Gran titration mode is embedded and supports automated slope determination, equivalence point calculation, and linear regression diagnostics per ASTM D1129.
Is remote firmware update supported over USB or network?

Firmware updates are performed via USB flash drive using signed .bin files; network-based updates require Leici LabLink Pro PC software and are validated against digital signatures prior to installation.
What electrode types are natively recognized?

All Leici-branded pH, ORP, and ISEs with integrated digital identification chips are auto-detected; third-party electrodes operate in analog mode with manual configuration.
How does the system enforce measurement validity before data acceptance?

It applies real-time electrode diagnostics (asymmetry potential, slope, response time), checks calibration drift against user-defined thresholds, and flags out-of-spec readings with audible/visual alerts prior to storage.