FangZhou PXJ-1C+ Benchtop Multi-Ion Analyzer

Overview

The FangZhou PXJ-1C+ Benchtop Multi-Ion Analyzer is a high-precision electrochemical instrument engineered for quantitative determination of ionic activity and concentration in aqueous solutions. Based on potentiometric measurement principles—utilizing ion-selective electrodes (ISEs) in conjunction with a high-impedance electrometer—the system delivers stable, reproducible readings across a wide dynamic range. It simultaneously supports pH, mV, ORP (oxidation-reduction potential), and temperature measurements, making it suitable for comprehensive water quality assessment in environmental monitoring, municipal wastewater treatment, drinking water compliance labs, and industrial process control. Its architecture complies with fundamental electrochemical metrology requirements, including Nernstian response validation, junction potential minimization, and low-noise signal conditioning. Designed for routine laboratory use, the PXJ-1C+ integrates robust analog front-end electronics with digital signal processing to ensure long-term stability under variable ambient conditions.

Key Features

• High-resolution LCD display with adjustable backlight and intuitive menu-driven navigation
• GLP-compliant data management: 4096 measurement records with timestamp (date + time), user ID tagging, and audit-ready export capability
• Advanced calibration architecture: up to 9-point ion concentration calibration with automatic standard curve generation and linear/non-linear regression options
• Multi-parameter measurement engine: simultaneous acquisition of pX, pH, mV, ORP, and temperature with selectable resolution modes (e.g., 0.001 pH / 0.01 mV)
• Pre-configured support for 16 standardized ions—including F⁻, Cl⁻, Br⁻, NH₄⁺, NO₃⁻, Na⁺—plus two user-defined ion parameters
• Thirteen concentration unit options with real-time conversion: pX, ppm, ppb, ppt, mol/L, mmol/L, µmol/L, nmol/L, %, µg/L, mg/L, g/L, ng/L
• Auto-temperature compensation (ATC) with dual-mode operation: manual or sensor-based (−20.0 to 135.0 °C); input impedance ≥3 × 10¹² Ω ensures minimal loading error with high-resistance ISEs
• Dual interface support: standard BNC electrode port + dedicated temperature probe connector; optional RS-232 and USB communication for external data logging

Sample Compatibility & Compliance

The PXJ-1C+ is validated for use with commercially available liquid-filled and solid-state ion-selective electrodes meeting ISO 8655-5 and ASTM D1293 specifications. It accommodates standard reference electrodes (e.g., Ag/AgCl, calomel) and supports both direct concentration mode and activity-based pX calculation. The instrument meets GLP documentation requirements per OECD Principles of Good Laboratory Practice, including traceable calibration logs, operator authentication fields, and immutable record timestamps. While not certified to IEC 61000-4 electromagnetic compatibility standards, its design incorporates shielding and filtering appropriate for typical analytical laboratory environments. All firmware operations adhere to deterministic execution timing, ensuring repeatability in regulated workflows such as those governed by EPA Method 300.0 (anions) or USP (pH and ionized species).

Software & Data Management

The included “FangZhou pH-Link” PC software enables bidirectional communication via USB or RS-232. It provides raw data visualization, statistical summary (mean, SD, CV%), customizable report templates (PDF/CSV/XLSX), and batch calibration file import/export. Audit trail functionality captures operator actions, parameter changes, and calibration events with ISO/IEC 17025-aligned metadata. Data files include embedded instrument ID, firmware version, and sensor serial numbers—facilitating traceability in multi-instrument laboratories. The software supports FDA 21 CFR Part 11–compatible electronic signatures when deployed on validated Windows platforms with domain-level user access controls.

Applications

• Environmental monitoring: quantification of fluoride, nitrate, and chloride in surface water, groundwater, and effluent per ISO 10304-1 and EN ISO 10304-2
• Drinking water safety verification: compliance testing against WHO guidelines and national standards (e.g., GB/T 5750.5–2023 in China)
• Wastewater treatment optimization: real-time tracking of ammonium and sodium during biological nitrification/denitrification
• Pharmaceutical water systems: conductivity-coupled ion analysis for Purified Water (PW) and Water for Injection (WFI) per USP
• Academic research: kinetic studies of ion exchange resins, membrane selectivity evaluation, and electrolyte thermodynamics experiments

FAQ

What ion-selective electrodes are compatible with the PXJ-1C+?
The analyzer accepts standard BNC-output ISEs from major suppliers (e.g., Thermo Scientific, Metrohm, Horiba) and supports both single-junction and double-junction configurations.
Does the instrument support automatic electrode diagnostics?
Yes—it performs real-time impedance monitoring, slope verification, and asymmetry potential checks during calibration and measurement cycles.
Can calibration data be exported for regulatory submission?
Calibration reports generated via pH-Link include full traceability metadata and may be archived in PDF/A-1b format compliant with ISO 19005-1.
Is temperature compensation mandatory for ion measurements?
While manual compensation is permitted, ATC is strongly recommended to correct for Nernst equation temperature dependence and minimize systematic bias.
How is measurement uncertainty estimated?
Uncertainty budgets follow EURACHEM/CITAC Guide CG4 methodology, incorporating contributions from electrode slope error, calibration standard uncertainty, temperature drift, and digitization noise.