AII GPR-2800 AIS Intrinsically Safe Oxygen Analyzer

Overview

The AII GPR-2800 AIS Intrinsically Safe Oxygen Analyzer is a field-mounted, continuous-duty electrochemical analyzer engineered for precise and reliable measurement of oxygen concentration in hazardous industrial environments. It operates on the principle of galvanic cell electrochemistry, where molecular oxygen diffuses through a selective membrane and undergoes a controlled redox reaction at the cathode, generating a current linearly proportional to the partial pressure of O₂ in the sample gas. This analog signal is conditioned, temperature- and pressure-compensated, and converted into a standardized 4–20 mA output. Designed for deployment in classified areas—specifically Class I, Division 1, Groups A–D (UL) and Zone 1 (ATEX)—the GPR-2800 AIS meets stringent intrinsic safety requirements when used with an approved safety barrier. Its robust NEMA 4X enclosure ensures protection against dust, water ingress, and corrosive atmospheres, supporting long-term operation in demanding process control, inerting verification, and confined-space monitoring applications.

Key Features

• Intrinsically safe design certified to ATEX II 2G Ex ia IIC T4 Ga and UL Class I, Division 1, Groups A–D — enabling direct installation in explosive atmospheres without purge or pressurization.
• Selectably ranged measurement from 0–1% to 0–100% O₂ full scale, optimized for both trace-level inerting validation and high-concentration ambient air monitoring.
• Maintenance-free electrochemical sensor (model GPR-11-32-4) with guaranteed minimum service life of 36 months at 25°C, eliminating routine electrolyte refills or membrane replacements.
• Integrated dual independent alarm outputs (programmable setpoints) for fail-safe process interlocks and operator notification.
• Real-time digital display (2.75″ × 1.375″) showing O₂ concentration, compensated temperature, and barometric pressure — all resolved to 0.01% O₂.
• Automatic temperature and atmospheric pressure compensation algorithms ensure measurement integrity across varying ambient and process conditions.
• True 2-wire, loop-powered architecture (12–28 VDC) simplifies wiring, reduces installation cost, and supports integration with existing DCS/PLC analog input cards.
• NEMA 4X-rated aluminum enclosure with IP66 protection, corrosion-resistant wetted materials (316 stainless steel, FKM elastomers, PTFE), and optional remote sensor capability (via XL-CX-2 extension kit).

Sample Compatibility & Compliance

The GPR-2800 AIS is validated for use with non-corrosive, non-condensing sample streams including nitrogen-, argon-, helium-, or hydrocarbon-based inerting gases, as well as ambient air and synthetic gas mixtures. It is not suitable for samples containing H₂S, Cl₂, SO₂, NOₓ, or high concentrations of CO₂ (>15%), which may poison the electrochemical sensor. The analyzer complies with CE marking directives (EMC 2014/30/EU, RoHS 2011/65/EU), carries UL listing per UL 61010-1 and UL 913 (for intrinsically safe apparatus), and conforms to IEC 60079-0, -11, and -26 for equipment protection by intrinsic safety. It supports GLP/GMP-aligned operational practices through documented calibration procedures and traceable standard gas usage, though it does not include built-in 21 CFR Part 11 audit trail functionality — external data loggers or DCS historians are recommended for regulated record retention.

Software & Data Management

The GPR-2800 AIS operates as a stand-alone analog transmitter with no embedded firmware or network connectivity. Configuration—including range selection, alarm thresholds, and zero/span calibration—is performed locally via sealed membrane keypad and displayed parameters. All settings are retained in non-volatile memory during power loss. While the unit lacks native digital communication protocols (e.g., HART, Modbus), its 4–20 mA output is fully compatible with industry-standard analog I/O systems, PLCs, SCADA platforms, and distributed control systems. For centralized monitoring, integration with third-party asset management software (e.g., Emerson DeltaV, Honeywell Experion, Siemens Desigo) is achieved via analog signal mapping and alarm forwarding. Calibration records must be manually logged per site-specific QA/QC protocols; no internal event logging or timestamped diagnostics are provided.

Applications

• Verification of inerting efficacy in chemical reactors, distillation columns, and storage tanks prior to maintenance or entry.
• Continuous oxygen monitoring in gloveboxes, dry rooms, and semiconductor fabrication environments where O₂ levels must remain below 1 ppm–1%.
• Safety-critical surveillance in hydrogen production, fuel cell testing, and battery manufacturing facilities.
• Process optimization in metal heat-treating furnaces, annealing lines, and sintering ovens utilizing nitrogen or forming gas atmospheres.
• Confined space entry pre-check and continuous ventilation monitoring per OSHA 1910.146 and NFPA 326 standards.
• Pharmaceutical lyophilization chamber atmosphere control and validation of nitrogen purge cycles.

FAQ

What certifications does the GPR-2800 AIS hold for hazardous area use?
It is certified to ATEX II 2G Ex ia IIC T4 Ga and UL Class I, Division 1, Groups A–D when installed with an approved intrinsically safe barrier (e.g., Pepperl+Fuchs KFD2-STC4-Ex1).
Can the analyzer measure below 0.1% O₂ accurately?
Yes — when configured to the 0–1% range, it achieves ±0.01% O₂ accuracy (±1% FS), making it suitable for critical inerting verification.
Is field calibration possible without specialized equipment?
Yes — single-point calibration using a certified span gas (≥80% of selected range) is supported via the front-panel interface; no PC or software is required.
How does pressure variation affect measurement?
Built-in absolute pressure sensing and real-time compensation correct for barometric drift and minor process pressure fluctuations, maintaining accuracy within specified limits.
What is the recommended sample flow rate and why?
1.0 L/min is optimal: lower flows risk diffusion-limited response; higher flows induce unnecessary pressure drop and mechanical stress on the sensor membrane.
Does the GPR-2800 AIS support remote sensor mounting?
Yes — with the optional XL-CX-2 cable assembly (up to 30 m), enabling sensor placement in extreme thermal or radiological zones while housing electronics in a safe, accessible location.