Sanxin沛瑞 MP551 Multi-Parameter Benchtop Electrochemical Meter

Overview

The Sanxin Peirui MP551 Multi-Parameter Benchtop Electrochemical Meter is a fourth-generation laboratory-grade electrochemical analyzer engineered for high-precision, multi-analyte measurement in regulated and research-intensive environments. It operates on established potentiometric, conductimetric, and amperometric principles—pH and ion concentration via glass electrode or ion-selective electrode (ISE) potential measurement; conductivity, TDS, salinity, and resistivity via four-electrode or two-electrode AC conductivity cell interrogation; and dissolved oxygen via Clark-type polarographic membrane electrode with temperature-, salinity-, and barometric pressure-compensated current detection. Designed to meet GLP (Good Laboratory Practice) compliance requirements—including full audit trail capability, user-accessible calibration logs, timestamped data storage, and secure parameter locking—the MP551 serves as a primary analytical platform in QC laboratories across pharmaceutical manufacturing, power generation (especially boiler feedwater and condensate monitoring), semiconductor ultrapure water systems, environmental testing, and academic electrochemistry research.

Key Features

• True multi-parameter architecture supporting simultaneous or sequential measurement of pH, mV, ion activity (pX), conductivity (0–2000 mS/cm across six auto-ranging segments), TDS, salinity, resistivity, dissolved oxygen (0–40.00 mg/L), and temperature (–10–110 °C).
• GLP-compliant data handling: 100–900 timestamped measurement records stored internally; RS232 interface enables traceable export to LIMS or validated data acquisition software; all calibrations logged with date, time, buffer IDs, slope, offset, and electrode status.
• Advanced electrode compensation algorithms: Automatic non-linear temperature compensation for ultrapure water conductivity (<10 μS/cm); dual-stage temperature compensation for high-purity and ammonia-doped water pH measurements; integrated barometric (80–105 kPa) and salinity (0–45 ppt) compensation for DO.
• Intelligent electrode diagnostics: Real-time stability indicator (“smiley” icon) driven by digital filtering and sliding average algorithms; automatic recognition of 13 pH standard buffers (CH, NIST, USA, and custom) and 8 conductivity standards (CN and international series).
• One-point conductivity calibration capability for K=1 cells across 0.01–200 mS/cm range—enabled by adaptive frequency and voltage modulation—eliminating need for multiple standard solutions while maintaining ±0.5% FS accuracy.
• Rugged benchtop construction: SMT-assembled PCBs; IP54-rated enclosure with silicone-sealed ports; serialized unit identification; CE, CMC, and ISO 9001:2000 certified manufacturing.

Sample Compatibility & Compliance

The MP551 accommodates aqueous samples ranging from aggressive industrial process streams (e.g., boiler blowdown, flue gas desulfurization slurries) to ultrapure water (UPW) with resistivity >10 MΩ·cm and low-ionic-strength biological buffers. Its modular electrode support includes tri-combination pH/ATC (201T-M), low-drift glass pH (2503-C), double-junction reference (6213), platinum black conductivity (2401-M), and polarographic DO (DO500) electrodes—all compatible with standard BNC, DIN, and 6-pin connectors. The instrument conforms to ASTM D1125 (pH of water), ASTM D5391 (conductivity of UPW), ISO 5814 (electrochemical DO determination), and USP (pH measurement). Its calibration and data management architecture supports FDA 21 CFR Part 11 readiness when paired with validated third-party software.

Software & Data Management

The included MP551 RS232 communication software provides bidirectional control and data logging under Windows OS. Users can configure measurement intervals, define custom calibration sequences, assign electrode IDs, and export CSV-formatted datasets with embedded metadata (operator ID, sample ID, calibration history, environmental conditions). All stored records include ISO 8601 timestamps, measurement units, and uncertainty flags. Audit trails are immutable and exportable for regulatory review. Firmware updates are performed via serial interface with version-controlled checksum verification.

Applications

• Pharmaceutical water system validation (PW, WFI, UPW) per EU GMP Annex 1 and USP .
• Boiler and steam cycle chemistry monitoring in thermal power plants, including cation conductivity and NH₃-amended pH profiling.
• Electrolyte formulation QC in battery R&D (Li-ion, solid-state), where precise Li⁺, F⁻, or pH control is critical.
• Environmental water quality assessment (surface, wastewater, seawater) per EPA methods 150.1 (pH), 120.1 (conductivity), and 360.1 (DO).
• Academic teaching and research labs requiring reproducible ISE measurements (Na⁺, Ca²⁺, F⁻, NO₃⁻, NH₄⁺) with configurable pX/mg/L/mol/L units and two-point calibration.

FAQ

Does the MP551 support FDA 21 CFR Part 11 compliance?
The hardware and firmware provide foundational controls (user authentication, audit trail, electronic signature placeholder), but full Part 11 compliance requires deployment with validated third-party data management software and site-specific procedural controls.
Can the MP551 measure pH in non-aqueous or low-ionic-strength samples?
Yes—using the 2503-C glass electrode and enabling high-purity water mode with enhanced temperature compensation; however, junction potential drift must be mitigated via double-junction reference (6213) and frequent recalibration.
Is automatic range switching available for conductivity measurements?
Yes—the instrument auto-selects one of six conductivity ranges based on measured value and applies appropriate cell constant correction and non-linear temperature compensation.
What electrode configurations are supported for ion concentration measurements?
All MP523-series ISEs (e.g., Na⁺, Ca²⁺, F⁻) are compatible when used with the 6213 double-junction reference electrode and matching temperature sensor; calibration uses two-point bracketing with certified standard solutions.
How is dissolved oxygen calibrated on the MP551?
Via two-point air-saturation (at known temperature, salinity, and atmospheric pressure) or water-saturation methods; the instrument computes saturation % and mg/L using the ISO 5814–2012 algorithm with built-in compensation coefficients.