Sanxin SX700 Series Portable Multi-Parameter Electrochemical Meter
| Brand | Sanxin |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Instrument Type | Portable |
| Parameter Capability | Multi-Parameter |
| pH Measurement Range | −2.00 to 19.99 pH |
| pH Resolution | 0.01 pH |
| pH Accuracy | ±0.01 pH |
| ORP Range | ±1999 mV |
| ORP Resolution | 1 mV |
| ORP Accuracy | ±0.1% FS |
| Conductivity Range | 0–200 mS/cm (5 segments) |
| TDS Range | 0–100 g/L |
| Salinity Range | 0–100 ppt |
| Resistivity Range | 0–100 MΩ·cm |
| Dissolved Oxygen Range | 0–40.00 mg/L (ppm), 0–199.9% saturation |
| DO Accuracy | ±0.10% FS |
| Temperature Compensation | Automatic (0–100 °C for pH |
| Salt Compensation | Automatic (0–45 ppt) |
| Pressure Compensation | Manual (66–200 kPa) |
| Calibration | Auto-recognition of 13 pH buffers (US/EU, NIST, and Chinese series) |
| Data Storage | 100–400 sets |
| Power | Two AA batteries (1.5 V × 2) |
| Dimensions (Meter) | 65 × 120 × 31 mm |
| Weight (Meter) | 180 g |
| Enclosure Rating | IP57 |
| Certifications | ISO 9001:2000, CE, CMC |
Overview
The Sanxin SX700 Series Portable Multi-Parameter Electrochemical Meter is a fourth-generation field-deployable analytical platform engineered for high-precision, multi-analyte measurement in aqueous solutions. Built upon integrated potentiometric, conductometric, and amperometric sensing principles, the instrument simultaneously quantifies pH, oxidation-reduction potential (ORP), electrical conductivity, total dissolved solids (TDS), salinity, resistivity, dissolved oxygen (DO), and temperature—without requiring external modules or software tethering. Its architecture follows electrochemical metrology standards defined in ASTM D1125 (conductivity), ASTM D888 (dissolved oxygen), and ISO 7888 (pH), ensuring traceability and repeatability across environmental monitoring, industrial process control, and regulatory sampling workflows. Designed explicitly for mobility and ruggedness, the SX700 operates independently of mains power or laboratory infrastructure, making it suitable for on-site deployment in wastewater treatment plants, power generation facilities, aquaculture operations, and field-based environmental assessments.
Key Features
- 8-pin waterproof electrode interface enabling plug-and-play recognition of pH, ORP, conductivity, and DO sensors—eliminating manual configuration errors and reducing setup time.
- Intelligent auto-calibration algorithms supporting 1–3 point pH calibration with automatic identification of 13 standardized buffer solutions across three international series (NIST, US/EU, and Chinese GB/T 27502–2011).
- Dual-mode pH compensation: standard linear temperature correction plus non-linear compensation optimized for ultrapure water and ammonia-dosed boiler feedwater—critical for compliance with IAPWS guidelines in thermal power plants.
- Adaptive conductivity measurement engine featuring auto-ranging across five decades (0.00 µS/cm to 199.9 mS/cm) and single-point K = 1 cell calibration validated per ASTM D1125 Annex A3.
- Fast-polarizing DO sensor (3–5 min stabilization) with concurrent automatic temperature and salinity compensation, plus manual barometric pressure adjustment per ISO 5814:2012.
- Digital signal processing incorporating sliding-window filtering and dynamic response optimization—stability confirmed visually via “smiley face” icon when measurement variance falls below ±0.005 pH or ±0.05 mS/cm over 5 s.
- IP57-rated enclosure certified to IEC 60529, enabling reliable operation in rain, dust, and temporary submersion (up to 1 m for 30 min).
Sample Compatibility & Compliance
The SX700 Series accommodates a broad spectrum of aqueous matrices—including raw surface water, treated effluent, cooling tower recirculation streams, pharmaceutical process water (PW/WFI), and marine samples—without requiring dilution or pretreatment. Its electrode compatibility supports routine use with Sanxin’s 201T-S (pH/ATC), 301Pt-S (ORP), 2301-S (conductivity), and DO500 (Clark-type DO) sensors, all compliant with GLP documentation requirements. The instrument meets electromagnetic compatibility (EMC) per EN 61326-1:2013 and safety standards per EN 61010-1:2010. While not 21 CFR Part 11–certified out-of-the-box, audit trails for calibration events, measurement timestamps, and operator IDs are stored internally and exportable via USB (optional adapter), facilitating alignment with GMP-aligned QA/QC protocols in regulated manufacturing environments.
Software & Data Management
Data logging is performed autonomously at user-defined intervals (1–999 s), storing up to 400 measurement records with full parameter sets, timestamps, and electrode IDs. Each entry includes ambient temperature, calibration status flags, and sensor-specific diagnostic metadata (e.g., slope %, asymmetry potential, membrane resistance). Export is supported via ASCII CSV format using optional USB-to-serial interface, compatible with LIMS platforms and spreadsheet-based trending tools. No proprietary software installation is required; raw files open natively in Excel or Python/Pandas for statistical analysis. Firmware updates are delivered via microSD card, preserving configuration integrity during version upgrades.
Applications
- Environmental field surveys: real-time pH and DO profiling in rivers, lakes, and estuaries per EPA Method 150.1 and ISO 5667-3.
- Power plant chemistry control: continuous monitoring of condensate pH and conductivity to detect condenser tube leakage per EPRI TR-102362.
- Aquaculture management: dissolved oxygen and salinity tracking in hatcheries and net-pen operations under FAO Technical Paper No. 577.
- Pharmaceutical water system validation: ultrapure water resistivity and TOC-correlated conductivity verification aligned with USP and EU Ph. Eur. 2.2.38.
- Wastewater treatment optimization: ORP-guided denitrification control and conductivity-based salinity load estimation in municipal and industrial WWTPs.
FAQ
Does the SX700 Series support GLP-compliant data recording?
Yes—each measurement stores date/time stamp, operator ID (configurable), electrode serial number, calibration history, and environmental conditions. Audit-ready logs are exportable without modification.
Can the instrument be used for high-purity water applications?
Yes—its non-linear temperature compensation algorithm for low-conductivity samples (<10 µS/cm) conforms to ASTM D5391 and is validated for UPW and WFI systems.
Is third-party calibration verification possible?
All sensor interfaces comply with DIN 19263 analog output conventions; raw mV and frequency outputs are accessible via test points for metrological validation using NIST-traceable reference instruments.
What maintenance is required for long-term field reliability?
Electrode storage caps must be filled with appropriate electrolyte; DO membranes require quarterly replacement; conductivity cells should be cleaned monthly with 0.1 M HNO₃ if scaling occurs. No internal user-serviceable components exist.
How does the SX700 handle variable atmospheric pressure during DO measurement?
It accepts manual kPa input (66–200 kPa range) and applies Henry’s law correction per ISO 5814:2012 Annex B, ensuring accuracy across elevations from sea level to 3000 m.
