METTLER TOLEDO FiveGo F4 Portable Dissolved Oxygen Meter

Overview

The METTLER TOLEDO FiveGo F4 Portable Dissolved Oxygen Meter is an electrochemical field instrument engineered for reliable, high-reproducibility dissolved oxygen (DO) measurements in aqueous samples under variable environmental conditions. It employs Clark-type polarographic or galvanic sensor technology—depending on the connected electrode—to quantify dissolved molecular oxygen concentration via amperometric current generation proportional to O₂ partial pressure. The F4 integrates automatic temperature, atmospheric pressure, and salinity compensation algorithms to ensure traceable accuracy across diverse sampling environments—from freshwater streams and wastewater treatment lagoons to marine surveys and aquaculture facilities. Designed for compliance-critical workflows, the instrument operates within ISO 5814:2012 and ASTM D888-22 guidelines for dissolved oxygen determination, supporting routine monitoring where portability, ruggedness, and metrological integrity are non-negotiable.

Key Features

• IP67-rated enclosure ensures full dust ingress protection and immersion resistance up to 1 m for 30 minutes—validated per IEC 60529—making it suitable for rain-exposed fieldwork, riverbank profiling, and industrial site audits.
• Ergonomic handheld form factor with a fold-out rear stand enables stable benchtop operation and one-handed measurement in constrained spaces.
• Segmented 3.1-inch LCD display provides high-contrast, low-power readability under direct sunlight or low-light conditions without backlight-induced battery drain.
• Intuitive single-button navigation simplifies operation across pH, conductivity, and DO modes—reducing operator training time and minimizing procedural errors in multi-parameter campaigns.
• Integrated pressure and salinity compensation eliminates manual correction tables; users input local barometric pressure (via built-in sensor or manual entry) and sample salinity to derive standardized mg/L values traceable to Winkler titration reference methods.
• Auto-endpoint detection with configurable acoustic tone and on-screen icon improves measurement consistency during serial sampling, particularly in high-throughput environmental monitoring programs.

Sample Compatibility & Compliance

The FiveGo F4 supports standard Clark-type DO probes with integrated thermistors (NTC 30 kΩ), compatible with both membrane-covered polarographic and maintenance-free galvanic sensors. It accepts samples across the full operational temperature range (0–50 °C) and accommodates saline concentrations up to 50.0 ppt—enabling accurate DO quantification in estuarine, coastal, and brackish water matrices. Calibration follows a two-point protocol (0% O₂ via sodium sulfite solution and 100% O₂ via air-saturated water), aligned with USP , EP 2.2.43, and ISO 5814 requirements. Device firmware supports audit-ready calibration logging, including date/time stamps, operator ID fields (via optional software integration), and sensor identification—facilitating GLP-compliant documentation in regulated laboratories and contract research organizations.

Software & Data Management

While the F4 operates as a standalone field instrument, its 200-entry internal memory stores timestamped DO readings alongside associated metadata: temperature, pressure, salinity, electrode ID, and calibration status. Data export is supported via optional METTLER TOLEDO LabX® Mobile Companion app (Bluetooth-enabled), enabling secure wireless transfer to Windows or iOS platforms. Exported CSV files include column headers compliant with LIMS ingestion standards (e.g., “Measurement_Time”, “DO_mgL”, “Temp_C”, “Pressure_hPa”, “Salinity_ppt”). All stored entries retain immutable timestamps and support electronic signature workflows when paired with LabX® desktop software—meeting FDA 21 CFR Part 11 requirements for electronic records and signatures in pharmaceutical and environmental compliance applications.

Applications

• Environmental monitoring: Routine DO profiling in rivers, lakes, wetlands, and effluent discharge points per EPA Method 360.1 and ISO 5815-1.
• Aquaculture management: Real-time dissolved oxygen tracking in fish hatcheries and recirculating aquaculture systems (RAS) to prevent hypoxia stress.
• Wastewater treatment: Aeration basin optimization and activated sludge process control through rapid spot-checking at multiple process stages.
• Drinking water distribution: Verification of residual DO levels post-chlorination and during storage tank inspections.
• Educational laboratories: Undergraduate and vocational training in aquatic chemistry, environmental science, and instrumental analysis—leveraging its intuitive interface and robust construction.

FAQ

What types of dissolved oxygen electrodes are compatible with the FiveGo F4?
The F4 accepts standard BNC and Cinch connectors for Clark-type DO sensors with integrated NTC 30 kΩ temperature elements. Both polarographic and galvanic probe variants are supported, provided they conform to METTLER TOLEDO’s FiveGo electrode specifications.
Does the F4 support automatic atmospheric pressure measurement?
Yes—the instrument includes an internal barometric pressure sensor (range: 500–1100 hPa), which can be enabled for real-time compensation. Alternatively, users may enter pressure manually using local weather station data.
Can calibration data be exported or audited separately from measurement records?
Calibration events are logged internally with timestamps and parameter settings. When synchronized with LabX® software, calibration history—including electrode slope, zero offset, and span deviation—is archived in a searchable database with user-access controls and change logs.
Is the F4 suitable for use in explosive or hazardous atmospheres?
No—the FiveGo F4 is not certified for ATEX, IECEx, or UL HazLoc environments. It is rated for general-purpose industrial and environmental field use only.
How does the F4 handle temperature compensation during DO measurement?
It applies either automatic compensation (using the integrated NTC sensor) or manual input; the algorithm corrects for oxygen solubility changes per ISO 5814 Annex A, referencing the Benson-Krause equation for thermal dependence of O₂ saturation.