Southland Sensing TO2-2x Fuel Cell Oxygen Sensor
| Origin | USA |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | TO2-2x |
| Price Range | USD 1–9,999 |
Overview
The Southland Sensing TO2-2x is a high-stability, electrochemical fuel cell oxygen sensor engineered for continuous, low-level oxygen monitoring in inert and reactive process gas streams. Operating on the principle of galvanic oxygen reduction—where O₂ diffuses through a selective membrane and undergoes catalytic reduction at the cathode—the sensor generates a linear microampere (µA) current proportional to partial pressure of oxygen. This zero-power, self-powered transduction mechanism eliminates external bias requirements and ensures intrinsic safety in hazardous environments. Designed for industrial process control and online analyzer integration, the TO2-2x delivers trace-level resolution down to 0.01 ppm O₂ across multiple auto-ranging spans (0–10 ppm, 0–100 ppm, 0–1,000 ppm, 0–1%, and 0–25% vol), making it suitable for applications demanding long-term stability, minimal drift, and immunity to background gas interference.
Key Features
- Fuel cell-based sensing architecture with no internal power supply required—ideal for intrinsically safe installations and remote deployments
- Multi-range capability: factory-configurable or user-selectable spans covering 0–10 ppm to 0–25% O₂, enabling flexible integration into diverse analyzer platforms
- Fast T₉₀ response time of ≤13 seconds across all ranges, ensuring timely detection of oxygen breakthrough events in purge or blanketing systems
- High metrological integrity: ±1% full-scale accuracy and ±0.5% repeatability under controlled calibration conditions
- Robust thermal design with temperature coefficient of 2.54%/°C—compensated via external analog or digital signal conditioning circuits
- Dual SPDT alarm relays (dry contact, 250 VAC/5 A) for independent high/low O₂ threshold triggering, configurable per application protocol
- Wide operational envelope: 0–50°C operating temperature, 0–100% RH non-condensing humidity tolerance, and recommended gas flow rate of 0.5–5 SCFH
- Long service life: 20–25 months typical functional lifetime under continuous operation; 6-month shelf life when stored per manufacturer specifications
Sample Compatibility & Compliance
The TO2-2x exhibits broad compatibility with non-corrosive, non-acidic gas matrices including nitrogen, argon, helium, hydrogen, methane, ethane, and other saturated hydrocarbons. It is explicitly not rated for use in strongly acidic, oxidizing (e.g., Cl₂, NOₓ), or solvent-saturated streams without upstream conditioning. While the sensor itself carries no intrinsic certification, its integration into analyzers intended for Class I Div 1/Zone 1 hazardous locations requires system-level compliance with UL 61010-1, ATEX 2014/34/EU, and IECEx standards. The device supports GLP/GMP-aligned data integrity practices when paired with analyzers featuring audit-trail-enabled firmware compliant with FDA 21 CFR Part 11.
Software & Data Management
As a transducer-level component, the TO2-2x outputs an analog current signal (285–590 µA, zero-to-full-scale) compatible with standard 4–20 mA input modules, PLC analog cards, and OEM analyzer signal processors. It does not incorporate embedded firmware or digital communication protocols (e.g., Modbus, HART). Integration into automated systems relies on external signal conditioning, linearization, temperature compensation, and range switching—typically implemented via host analyzer firmware. For regulatory environments, validated calibration procedures—including span gas verification with NIST-traceable O₂ standards (e.g., ASTM D6299, ISO 8573-7)—are required to maintain measurement traceability.
Applications
- Inert gas purity monitoring in semiconductor fab nitrogen blanketing lines and wafer annealing furnaces
- Oxygen leak detection in hydrogen generation and purification skids (PEM electrolysis, PSA systems)
- Quality assurance in cryogenic air separation unit (ASU) product streams and pipeline natural gas custody transfer
- Process validation in pharmaceutical nitrogen purging of reactors and lyophilizers per USP
- Real-time O₂ trending in aerospace-grade argon shielding gas for titanium welding and additive manufacturing
- Residual oxygen quantification in high-temperature metallurgical furnace atmospheres (e.g., sintering, brazing)
FAQ
What gases are incompatible with the TO2-2x sensor?
Acidic gases (e.g., SO₂, HCl, CO₂ above 5% v/v), chlorine, ozone, nitrogen oxides, and organic vapors (e.g., acetone, ethanol) will degrade the electrolyte and permanently impair performance.
Does the TO2-2x require periodic recalibration?
Yes—recommended at intervals not exceeding 3 months for critical applications, using certified zero gas (e.g., high-purity N₂) and span gas traceable to NIST or equivalent national metrology institute.
Can the TO2-2x be used in high-pressure sampling systems?
No—it is rated for ambient pressure operation only; pressure regulation to ~1 atm absolute is mandatory upstream of the sensor inlet.
Is temperature compensation built into the sensor?
No—temperature compensation must be applied externally via the host analyzer’s signal processing algorithm using the specified 2.54%/°C coefficient.
What is the electrical interface configuration?
Two-terminal design: center foil (cathode, negative) and outer foil (anode, positive); no ground reference or shield required.
