WTW Multi350i Portable Multiparameter Water Quality Analyzer
| Origin | Germany |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | Multi350i |
| Pricing | Available Upon Request |
Overview
The WTW Multi350i is a high-precision, handheld multiparameter water quality analyzer engineered for field-deployable and laboratory-grade measurements in environmental monitoring, wastewater treatment, drinking water verification, and aquatic research. Based on potentiometric (pH, ORP, ion-selective), amperometric (dissolved oxygen), and conductometric (conductivity, salinity, TDS, resistivity) measurement principles, the Multi350i delivers traceable, reproducible data across six core parameters—pH, dissolved oxygen (DO), oxidation-reduction potential (ORP), conductivity, temperature, and selective ion concentration (e.g., F⁻, Cl⁻)—in a single, ruggedized platform. Its modular electrode interface supports all current WTW laboratory-grade sensors—including IQ and TetraCon series pH/ORP electrodes, DurOx polarographic DO probes, and IonSelect™ ion-selective electrodes—enabling method flexibility without hardware replacement. Designed for compliance-critical workflows, the instrument meets fundamental requirements for ISO 5667 (water sampling), ASTM D1293 (pH of water), ASTM D888 (DO in water), and EN 27888 (conductivity), serving as a validated tool in GLP-aligned environmental laboratories.
Key Features
- Simultaneous real-time display of up to six parameters: pH, DO, ORP, conductivity, temperature, and ion concentration
- Large backlit graphical LCD with intuitive menu navigation and multilingual UI support (English, German, French, Spanish)
- Integrated NiMH rechargeable battery providing up to 1500 hours of standby operation or >100 hours of continuous use per charge
- 1500-measurement internal memory with automatic timestamping (date/time), electrode ID logging, and user-defined sample IDs
- Automatic range switching across five conductivity decades (0.0 µS/cm to 500 mS/cm) and dual-resolution pH/mV modes (0.001/0.01 pH; 0.1/1 mV)
- IP67-rated housing for dust/water resistance during field deployment; operating temperature range: –5.0 to +105.0 °C
- Calibration management with up to three-point pH, two-point DO (air saturation & zero), and multi-point conductivity/salinity calibration routines
Sample Compatibility & Compliance
The Multi350i is validated for aqueous matrices including freshwater, seawater, wastewater effluents, groundwater, and process water. It accommodates standard 12-mm and miniaturized 6-mm electrode formats, supporting WTW’s full portfolio of certified reference electrodes and ISEs (e.g., Fluoride ISE Model 9635TP, Chloride ISE Model 9617TP). All sensor interfaces comply with DIN EN ISO/IEC 17025 traceability requirements when used with WTW-certified calibration standards. Data integrity conforms to basic ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate), with optional PC connectivity enabling audit-ready export for regulatory reporting under EPA Method 150.1 (conductivity), USP (pH), and ISO 5814 (DO).
Software & Data Management
Data transfer occurs via USB-C or Bluetooth 5.0 to WTW’s LabX® Lite software (Windows/macOS), enabling secure export in CSV, PDF, or XML formats. The instrument logs calibration history, electrode diagnostics (e.g., slope, offset, response time), and measurement uncertainty estimates per parameter. While the Multi350i does not natively support FDA 21 CFR Part 11 electronic signatures, its data structure aligns with GMP/GLP documentation workflows when paired with LabX®’s optional audit trail module and user access control configuration.
Applications
- Regulatory field surveys for EPA Clean Water Act compliance and EU Water Framework Directive monitoring
- Real-time process control in municipal and industrial wastewater treatment plants
- Source water assessment and distribution system integrity verification
- Academic and ecological studies requiring portable, multi-analyte capability in lakes, rivers, and estuaries
- Calibration verification and performance qualification of fixed online analyzers
- Emergency response testing during chemical spills or algal bloom events
FAQ
Which ion-selective electrodes are compatible with the Multi350i?
All WTW IonSelect™ electrodes with BNC or mini-DIN connectors—including fluoride (F⁻), chloride (Cl⁻), nitrate (NO₃⁻), ammonium (NH₄⁺), and calcium (Ca²⁺) models—are fully supported.
Does the instrument support automatic temperature compensation (ATC) for all parameters?
Yes—ATC is applied in real time for pH, conductivity, salinity, TDS, resistivity, and DO measurements using integrated Pt1000 or NTC temperature sensors.
Can measurement data be exported directly to LIMS systems?
Via LabX® Lite, data can be exported as structured CSV or XML files compatible with most LIMS import protocols; direct API integration requires LabX® Professional edition.
What is the typical calibration frequency for routine field use?
Daily calibration is recommended for critical applications; weekly calibration suffices for stable, low-risk matrices—always verified against traceable NIST-traceable standards.
Is the Multi350i suitable for seawater measurements?
Yes—its extended conductivity range (up to 500 mS/cm) and salinity mode (0.0–70.0 ppt) are optimized for marine and brackish water analysis using K=1.0 or K=0.1/cm cells.
