Sanxin MP511 Benchtop pH Meter
| Brand | Sanxin |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Manufacturer |
| Product Category | Domestic |
| Model | MP511 |
| Instrument Type | Benchtop |
| Parameter Type | Single-Parameter |
| pH Measurement Range | −2.00 to 19.99 pH |
| Resolution | 0.01 pH |
| Accuracy (Meter) | ±0.01 pH |
| Accuracy (System w/ Electrode) | ±0.02 pH |
| Input Current | ≤2×10⁻¹² A |
| Input Impedance | ≥1×10¹² Ω |
| Stability | ±0.01 pH / 3 h |
| Temperature Compensation Range | 0–100 °C (Auto/Manual) |
| mV/ORP Range | −1999 to +1999 mV |
| mV Resolution | 1 mV |
| mV Accuracy | ±0.1% FS |
| Temperature Measurement Range | −10 to 110 °C |
| Temp Resolution | 0.1 °C |
| Temp Accuracy | ±0.5 °C (5–60 °C), ±1.0 °C (other) |
| Data Storage | 600 sets (ID, pH/mV, temp, ATC/MTC status, date, time) |
| Power Supply | DC 9 V / 300 mA |
| Interface | RS232 |
| Dimensions & Weight | 160 × 190 × 70 mm / 880 g |
| Certifications | ISO 9001:2015, CE, CMC |
| Operating Environment | 5–40 °C, ≤85% RH |
| IP Rating | IP54 |
Overview
The Sanxin MP511 Benchtop pH Meter is a precision electrochemical instrument engineered for routine and educational laboratory applications requiring reliable, traceable pH and redox potential (ORP) measurements in aqueous solutions of moderate ionic strength. Based on potentiometric measurement principles—where the electromotive force (EMF) generated at the interface between a pH-sensitive glass membrane electrode and a stable reference electrode is converted into a digital pH reading—the MP511 delivers high reproducibility and long-term stability. Its extended pH range (−2.00 to 19.99) supports both strongly acidic and highly alkaline samples, including industrial effluents, surface waters, boiler feedwater, and ammonia-amended pure water—common in power generation and petrochemical QA/QC workflows. The instrument integrates automatic temperature compensation (ATC) via a built-in thermistor within the 201T-M tri-combination electrode, ensuring accurate pH values across dynamic thermal conditions without manual recalibration.
Key Features
- GLP-compliant operation with timestamped data logging, user-defined ID tagging, and full audit trail support for regulatory review
- Three selectable measurement modes: Stable Read (with “smiley” icon confirmation), Timed Interval, and Continuous Monitoring
- Intelligent auto-recognition of standard buffer series (NIST, DIN/European, and Chinese GB/T 27502–2011), enabling rapid, error-resistant calibration
- Dual-mode pH measurement: General-purpose mode and specialized High-Purity Water mode—with dual temperature compensation (electrode slope + solution-specific thermal coefficient)
- Integrated ORP (mV) measurement function with direct reporting vs. Standard Hydrogen Electrode (SHE), compliant with ASTM D1129 and ISO 5814
- Digital signal processing using sliding-average filtering and adaptive noise rejection to suppress transient electrical interference
- IP54-rated enclosure with silicone-sealed electrode ports, suitable for humid or splash-prone lab environments
- Self-diagnostic system that alerts users to open-circuit electrodes, low battery, calibration drift, or impedance anomalies
Sample Compatibility & Compliance
The MP511 is optimized for aqueous samples with conductivity >20 µS/cm and total dissolved solids (TDS) <10,000 ppm. It is validated for use with environmental water matrices (e.g., EPA Method 150.1), municipal wastewater (ISO 10523), and process streams in pharmaceutical clean utilities (USP supporting documentation). While not designed for non-aqueous solvents or high-viscosity slurries, its 201T-M electrode features a low-resistance Ag/AgCl reference junction and robust polymer body—enabling consistent performance in field-deployable or teaching-lab settings. All firmware and calibration logic comply with ISO/IEC 17025:2017 requirements for measurement uncertainty estimation and metrological traceability. The instrument’s CE marking confirms conformity with EU Electromagnetic Compatibility (2014/30/EU) and Low Voltage (2014/35/EU) directives.
Software & Data Management
Data export and remote control are enabled via RS232 serial interface using the included MP511 Communication Software (Windows-compatible). The software supports real-time data streaming, batch export to CSV or Excel, customizable report templates (including GLP headers), and secure local archiving. All stored entries include measurement ID, pH/mV value, temperature, ATC activation status, calibration history reference, and full timestamp (date + time). Audit logs record operator-initiated events—including calibration, parameter changes, and memory clears—meeting FDA 21 CFR Part 11 requirements for electronic records when deployed with appropriate access controls and electronic signatures.
Applications
- Environmental monitoring labs performing routine surface water and wastewater pH profiling per ISO 10523 and APHA Standard Methods 4500-H⁺ B
- University teaching laboratories conducting foundational electrochemistry experiments and calibration protocol training
- Power plant chemistry departments measuring ultra-pure water pH under ammonia treatment (ASTM D4582)
- Quality control labs in food & beverage, cosmetics, and chemical manufacturing verifying batch consistency against internal specifications
- Research facilities requiring stable, low-drift pH tracking during kinetic studies or titration endpoint verification
FAQ
Does the MP511 support automatic calibration with two or three points?
Yes—it supports 1-, 2-, or 3-point calibration using any combination of certified buffers from the NIST, European, or Chinese series. Calibration coefficients (offset and slope) are automatically calculated and stored.
Can the MP511 measure pH in low-conductivity deionized water?
It includes a dedicated High-Purity Water mode that applies enhanced temperature compensation algorithms to minimize junction potential errors common in ultrapure water (≤1 µS/cm).
Is the RS232 interface compatible with modern computers lacking legacy serial ports?
Yes—standard USB-to-RS232 adapters (FTDI chipset recommended) are fully supported; driver installation is required only once per host system.
What is the expected service life of the 201T-M electrode under normal lab use?
With proper storage (in 3 M KCl solution), regular cleaning, and avoidance of protein/fat fouling, the electrode typically maintains specification-grade performance for 12–18 months.
Does the MP511 meet requirements for ISO/IEC 17025-accredited testing?
Yes—when used with certified reference materials, documented calibration procedures, and controlled environmental conditions, it satisfies clause 6.4.10 (measurement equipment verification) and clause 7.7 (result reporting) of ISO/IEC 17025:2017.
