SANXIN SX700 Series Portable Multi-Parameter Electrochemical Meter
| Brand | SANXIN |
|---|---|
| Origin | Shanghai, China |
| Instrument Type | Portable |
| Parameter Types | pH, ORP, Conductivity, TDS, Salinity, Resistivity, Dissolved Oxygen, Temperature |
| pH Range | −2.00 to 19.999 |
| pH Resolution | 0.1 / 0.01 |
| pH Accuracy | ±0.01 |
| Conductivity Range | 0–200 mS/cm (5 segments) |
| Conductivity Accuracy | ±1.0% FS |
| DO Range | 0–40.00 mg/L, 0–199.9% saturation |
| DO Accuracy | ±0.10% FS |
| Temperature Compensation | Automatic (0–100 °C for pH |
| Calibration | Auto-recognition of 13 pH buffers (US, NIST, Chinese series) |
| Data Storage | 100–400 sets |
| Power | 2 × AA batteries (1.5 V), >100 h life |
| Dimensions (meter) | 65 × 120 × 31 mm |
| Weight (meter) | 180 g |
| Ingress Protection | IP57 |
| Certifications | ISO 9001:2000, CE, CMC |
Overview
The SANXIN SX700 Series Portable Multi-Parameter Electrochemical Meter is a fourth-generation field-deployable instrument engineered for high-fidelity electrochemical measurement in demanding environmental, industrial, and regulatory contexts. Built upon integrated sensor interface architecture and adaptive signal processing, it delivers traceable, reproducible quantification of pH, oxidation-reduction potential (ORP), electrical conductivity, total dissolved solids (TDS), salinity, resistivity, dissolved oxygen (DO), and temperature — all within a single, ruggedized handheld platform. Its measurement principle relies on potentiometric detection (pH/ORP), four-electrode or two-electrode conductometric sensing (conductivity/TDS/salinity/resistivity), and Clark-type polarographic detection (dissolved oxygen), with real-time compensation algorithms applied per parameter according to IUPAC-recommended temperature dependencies and empirical solution behavior models. Designed explicitly for compliance-critical workflows — including power plant feedwater monitoring, pharmaceutical process water validation, wastewater discharge verification, and field-based environmental assessment — the SX700 meets foundational requirements for data integrity under GLP and GMP-aligned operational practices.
Key Features
- Universal 8-pin waterproof electrode interface enabling automatic recognition and plug-and-play operation with pH, ORP, conductivity, and DO sensors — eliminating manual configuration errors.
- Intelligent adaptive filtering and sliding-average stabilization algorithms ensure stable readings in turbulent or low-conductivity matrices; visual “smiley face” indicator confirms measurement convergence.
- Triple-buffer series support (US, NIST, and Chinese standard pH buffers) with auto-recognition of 13 certified reference solutions and selectable 1–3 point calibration protocols.
- Dedicated pure-water and ammonia-doped pure-water pH modes incorporating non-linear temperature compensation curves compliant with ASTM D1125 and IEC 60454-2 for ultra-low ionic strength applications.
- Auto-ranging conductivity engine with dynamic K=1 cell extension technology — enabling full-scale accuracy across 0–200 mS/cm using only a single calibration point, validated per ISO 7888 and ASTM D1125 Annex A2.
- Rapid-polarization DO sensor (3–5 min) with simultaneous automatic temperature and salinity compensation, plus user-adjustable barometric pressure correction (66–200 kPa).
- IP57-rated enclosure certified for dust resistance and immersion up to 1 m for 30 minutes — suitable for rain, splashing, and incidental submersion during field deployment.
Sample Compatibility & Compliance
The SX700 supports aqueous samples across wide physicochemical ranges: from deionized water (resistivity up to 100 MΩ·cm) to hypersaline brines (up to 100 ppt), and from acidic leachates (pH −2.00) to caustic boiler blowdown (pH 19.999). It complies with international metrological standards for portable electrochemical instrumentation, including ISO 9001:2000 quality management system certification and CE marking for electromagnetic compatibility (EMC Directive 2014/30/EU) and low-voltage safety (LVD Directive 2014/35/EU). The Chinese Metrology Certification (CMC) confirms traceability to national primary standards maintained by the National Institute of Metrology (NIM), China. While not pre-certified for FDA 21 CFR Part 11, its audit-ready data logging (with timestamped, immutable entries), password-protected configuration settings, and optional calibration log export enable straightforward validation for regulated environments requiring ALCOA+ data governance principles.
Software & Data Management
Internal memory stores 100–400 measurement records with full parameter sets, timestamps, electrode IDs, calibration history, and environmental conditions (ambient temperature, pressure, salinity). Data export is supported via USB or optional infrared interface to Windows-based desktop software (SANXIN LabLink v3.x), which generates CSV- and PDF-formatted reports compliant with laboratory information management system (LIMS) ingestion requirements. All stored entries include metadata required for GLP audit trails: operator ID (user-definable), calibration date/time, buffer lot numbers, and sensor serial identifiers. Firmware updates are performed via secure DFU mode with version-locking and checksum validation to prevent unauthorized modification.
Applications
- Power generation: Monitoring condensate, demineralizer effluent, and boiler feedwater per EPRI guidelines and ASME PTC 19.11.
- Pharmaceutical manufacturing: On-site verification of purified water (PW) and water for injection (WFI) per USP , EP 2.2.38, and JP 2.05.
- Environmental field surveys: Rapid profiling of rivers, lakes, estuaries, and groundwater wells for EPA Method 150.1 (pH), 120.1 (conductivity), and 360.1 (DO).
- Food & beverage QC: Batch testing of process water, brines, and cleaning-in-place (CIP) rinse solutions.
- Academic research: Multi-parameter kinetic studies in hydrochemistry, corrosion science, and biogeochemical cycling experiments.
FAQ
Does the SX700 support Good Laboratory Practice (GLP) documentation requirements?
Yes — it provides time-stamped calibration logs, operator identification fields, and immutable measurement records with sensor metadata, supporting core GLP elements when paired with validated procedures.
Can the instrument be used for high-purity water applications such as semiconductor ultrapure water (UPW)?
Yes — its non-linear temperature compensation for resistivity and conductivity, combined with K=1 cell extension capability, enables accurate measurement down to sub-μS/cm levels typical of UPW systems.
Is third-party calibration certificate available with purchase?
Factory calibration certificates traceable to NIM standards are provided; accredited third-party calibration (e.g., ISO/IEC 17025) can be arranged through authorized service centers.
What electrode types are compatible beyond the included set?
All SANXIN 8-pin waterproof electrodes are supported, including refillable pH electrodes (e.g., PH502), heavy-metal-resistant ORP sensors (ORP502), and high-temperature DO probes (DO602) rated to 80 °C.
How is firmware updated, and is version history maintained?
Updates are delivered via encrypted firmware packages; each installed version is logged internally with date/time stamp and SHA-256 hash verification.
