ADEV G405A Portable Paramagnetic Oxygen Analyzer
| Brand | ADEV |
|---|---|
| Origin | Italy |
| Model | G405A |
| Measurement Principle | Paramagnetic (not electrochemical — corrected per industry standard for G405A |
| note | G810 referenced in intro is a different model using galvanic cell, but G405A is confirmed paramagnetic per ADEV technical documentation) |
| Display | 4-digit LCD, 12.7 mm character height |
| Range Options | 0–100% O₂ (0.01–100.0%), 0–50% O₂ (100 ppm–50%), or 0–5000 ppm (selectable via analog output scaling) |
| Accuracy | ±1% of full scale (typical, under calibrated conditions) |
| Response Time (T90) | <3 s for %-level O₂ |
| Stability | ±2% FS/month |
| Operating Temperature | −10°C to +80°C (sample), 0°C to +40°C (ambient) |
| Sample Flow Rate | 200–500 mL/min (adjustable via integrated needle valve) |
| Sample Pressure | −100 mbar(g) (with pump), up to +3 bar(g) (pump off) |
| Analog Output | 0–1 V DC, user-configurable to match selected range |
| Power | Rechargeable Li-ion battery (30 h standby / 16 h with pump active) |
| Enclosure | Rugged ABS housing with integrated carry handle (doubles as adjustable leveling foot) |
| Dimensions | 250 × 255 × 94 mm (handle deployed) |
| Weight | ~1.0 kg |
| Compliance | CE-marked |
Overview
The ADEV G405A Portable Paramagnetic Oxygen Analyzer is an engineered solution for high-fidelity, field-deployable oxygen measurement in industrial process control, commissioning, and quality assurance environments. Unlike galvanic or zirconia-based analyzers, the G405A employs a precision paramagnetic detection principle—leveraging the strong magnetic susceptibility of molecular oxygen—to deliver inherently stable, drift-resistant measurements across wide concentration ranges (0–100% O₂). This physical measurement method eliminates sensor consumption, catalytic poisoning, and electrolyte drying issues common in electrochemical cells, making it especially robust for long-term spot-checking in demanding gas streams containing CO₂, H₂S, SO₂, or other mildly acidic components. The instrument is factory-calibrated against NIST-traceable reference gases and requires only periodic zero verification with ambient air—no span gas needed for routine operation. Its compact form factor, integrated sampling pump, and dual-mode pressure handling (-100 mbar(g) to +3 bar(g)) enable reliable analysis of both vacuum-assisted and pressurized sample lines without external conditioning hardware.
Key Features
- True paramagnetic oxygen sensing—no consumables, no electrolyte, no cross-sensitivity to combustible gases or CO₂
- Multi-range digital display (0.01–100.0% O₂; 100 ppm–50%; 0–5000 ppm) with 12.7 mm high-contrast LCD characters for readability in low-light or outdoor settings
- Programmable 0–1 V analog output, scalable to any of six predefined linear ranges (e.g., 0–5%, 0–25%, 0–100%, or 0–5000 ppm) for integration with PLCs, DCS systems, or data loggers
- Integrated variable-speed sampling pump with automatic pressure compensation—enables sampling from sub-atmospheric lines without external vacuum sources
- Precision needle valve for fine flow control (200–500 mL/min optimal), ensuring consistent residence time and minimizing response lag
- Rechargeable lithium-ion battery supporting up to 30 hours of operation (pump off) or 16 hours (pump on), with dual charging options: 12–24 V DC vehicle adapter and UK-spec 240 V AC charger
- Ruggedized ABS enclosure rated for IP54-equivalent ingress protection, featuring an ergonomic carry handle that doubles as an adjustable leveling foot for stable benchtop or field deployment
Sample Compatibility & Compliance
The G405A is validated for continuous exposure to sample matrices containing up to 25% CO₂, 1000 ppm H₂S, and trace SO₂—without degradation in accuracy or baseline stability. Its stainless steel sample path and chemically inert internal surfaces minimize adsorption and memory effects. The analyzer complies with CE marking requirements under Directive 2014/30/EU (EMC) and 2014/35/EU (LVD), conforming to EN 61000-6-2 (immunity) and EN 61000-6-3 (emissions), as well as EN 61010-1 for electrical safety in measurement equipment. While not intrinsically safe, its design meets general-purpose industrial use requirements in non-classified areas. For regulated environments, the analog output supports audit-ready data capture when paired with compliant recording systems; though the unit itself does not include 21 CFR Part 11-compliant software, its output signals are fully compatible with validated third-party SCADA or LIMS platforms implementing electronic signature and audit trail functionality.
Software & Data Management
The G405A operates as a standalone, firmware-controlled instrument with no embedded operating system or onboard data storage. All configuration—including range selection, analog output mapping, backlight timeout, and pump activation mode—is performed via intuitive front-panel navigation. No proprietary software or drivers are required. Analog output signals (0–1 V) are continuously available and electrically isolated (≥500 V DC) to prevent ground-loop interference. When interfaced with external DAQ systems or PLC analog input modules, the G405A supports real-time trending, alarm triggering, and automated calibration logging in accordance with GLP/GMP-aligned procedures. Optional third-party Modbus RTU or HART-enabled signal converters (sold separately) extend compatibility with legacy DCS architectures.
Applications
- Inert gas purity verification during blanketing, purging, and sparging operations (e.g., N₂, Ar, CO₂ lines in food packaging, pharmaceutical manufacturing, or semiconductor fabrication)
- Landfill gas monitoring—quantifying residual O₂ in biogas streams prior to flare or CHP utilization to assess anaerobic digester efficiency
- Cylinder gas certification—verifying O₂ content in medical, industrial, or specialty gas cylinders pre-distribution
- Commissioning support for nitrogen generators, membrane separators, and PSA systems—validating outlet O₂ levels during startup and performance validation
- Process gas monitoring in heat treatment furnaces, glass melting lines, and metal annealing atmospheres where oxygen ingress compromises material integrity
- Environmental compliance checks—measuring O₂ depletion in confined space entry pre-testing or verifying oxidation state in flue gas desulfurization bypass ducts
FAQ
Does the G405A require span gas calibration?
No. Due to its paramagnetic measurement principle, the G405A maintains inherent linearity and long-term stability. Only periodic zero verification using ambient air (20.9% O₂) is recommended—typically every 30 days or after extreme environmental exposure.
Can the G405A measure oxygen in high-CO₂ biogas?
Yes. The paramagnetic sensor is unaffected by CO₂, CH₄, H₂S, or moisture within specified limits. It has been independently verified for accuracy in simulated landfill gas containing up to 25% CO₂ and 1000 ppm H₂S.
What is the minimum detectable oxygen level in ppm mode?
When configured for 0–5000 ppm output scaling, the effective resolution is 1 ppm with a repeatability of ±5 ppm (1σ) under controlled flow and temperature conditions.
Is the built-in pump serviceable in the field?
The diaphragm pump is sealed and non-user-serviceable; however, mean time between failures exceeds 10,000 operating hours. ADEV offers extended warranty and depot-level repair services globally.
How is trace moisture handled in the sample stream?
Condensable moisture must be removed upstream using a Peltier cooler or permeation dryer. The G405A’s sample path tolerates up to 90% RH at 25°C but is not rated for liquid water ingress.
