ONUEE UYI-U700 Tunable Diode Laser Absorption Spectroscopy (TDLAS) Online Gas Analyzer
| Brand | ONUEE |
|---|---|
| Origin | Guangdong, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | UYI-U700 |
| Linear Error | ≤±1% FS |
| Span Drift | ≤±1% FS |
| Response Time | ≤20 s (field-dependent) |
| Measurement Principle | TDLAS |
| Measurable Gases | CH₄, CO₂, CO, NH₃, H₂S, HF |
| Concentration Range | ppm to % vol |
| Accuracy | ≤±1% FS |
| Calibration Interval | ≤2 times/year |
| Power Supply | 220 VAC |
| Output Signals | 4–20 mA or RS485 |
| Operating Temperature | −20 °C to +60 °C |
| Sample Flow Rate | 20–30 L/h |
| Enclosure Dimensions | 500 × 500 × 200 mm (typical) |
| Compliance | Designed for industrial process environments requiring continuous emission monitoring and safety-critical gas detection |
Overview
The ONUEE UYI-U700 is a fixed-mount, in-situ or extractive online gas analyzer engineered for continuous, real-time concentration measurement of key process and hazardous gases—including methane (CH₄), carbon dioxide (CO₂), carbon monoxide (CO), ammonia (NH₃), hydrogen sulfide (H₂S), and hydrogen fluoride (HF). It operates on the physical principle of Tunable Diode Laser Absorption Spectroscopy (TDLAS), a highly selective spectroscopic technique that exploits narrow-line absorption features in the near-infrared (NIR) or mid-infrared (MIR) spectral region. By precisely tuning a semiconductor laser across a target gas’s rotational-vibrational absorption line—and employing long-path optical reflection (e.g., multipass cell or reflective probe configuration)—the UYI-U700 achieves high signal-to-noise ratio, minimal cross-sensitivity, and immunity to particulate scattering or background interference common in harsh industrial streams. Its design targets applications where regulatory compliance, process safety integrity, and long-term measurement stability are non-negotiable—such as flare gas monitoring, syngas composition control, boiler combustion optimization, and fugitive emission detection.
Key Features
- Core TDLAS platform with wavelength-scanned single-line detection, eliminating need for consumable reagents or optical filters
- Integrated long optical path architecture enabling sub-ppm detection limits and high dynamic range (ppm to % vol)
- Field-configurable probe or extractive sampling interface, compatible with high-dust, high-moisture, or corrosive process streams when paired with application-specific pre-conditioning systems
- Intrinsically safe and explosion-proof variants available (certified to IECEx/ATEX standards per customer specification)
- Low-maintenance optical path with sealed, alignment-free optics and self-diagnostic laser health monitoring
- Embedded edge intelligence supporting local data logging, alarm triggering, and protocol translation (Modbus TCP, MQTT, OPC UA upon request)
- Modular hardware architecture facilitating field-upgradable firmware, gas module swaps, and sensor redundancy integration
Sample Compatibility & Compliance
The UYI-U700 is validated for use with dry and wet sample matrices typical of refinery off-gas, biogas upgrading lines, cement kiln exhaust, and coal gasification syngas. When deployed with an ONUEE-engineered sample conditioning system—including heated filtration, condensate removal, pressure regulation, and flow stabilization—it maintains metrological performance under ISO 14001-aligned ambient conditions (−20 °C to +60 °C ambient; up to 95% RH non-condensing). The analyzer meets electromagnetic compatibility requirements per IEC 61326-1 and functional safety guidelines aligned with IEC 61508 SIL 2 for safety-related subsystems. While not pre-certified to US EPA PS-15 or EN 15267, its measurement traceability supports validation against NIST-traceable calibration gases and enables compliance documentation for ISO 50001 energy management systems and EU Industrial Emissions Directive (IED) reporting frameworks.
Software & Data Management
The UYI-U700 runs ONUEE’s proprietary embedded firmware v3.2+, featuring dual-mode operation: standalone mode with local LCD interface and full remote supervision via Ethernet or optional cellular gateway. Configuration, diagnostics, and trend analysis are accessible through a secure web-based HMI compliant with TLS 1.2 and role-based user authentication. All analog (4–20 mA) and digital (RS485/Modbus RTU) outputs support configurable scaling, damping, and fault signaling. Audit trails—including calibration events, zero/span adjustments, and firmware updates—are stored with timestamps and operator IDs, satisfying GLP/GMP-aligned record retention requirements. Optional cloud integration enables time-series visualization, predictive maintenance alerts, and automated report generation compatible with enterprise SCADA and MES platforms.
Applications
- Natural gas transmission: Real-time CH₄ purity verification and H₂S slip monitoring at custody transfer points
- Coal chemical plants: Syngas composition control (CO/CO₂/H₂ ratios) for Fischer–Tropsch reactor feed optimization
- Power generation: Combustion efficiency tuning via O₂–CO co-monitoring in flue gas ducts
- Waste-to-energy facilities: NH₃ slip detection post-SCR and HF concentration tracking in incinerator scrubber bypass streams
- Cement and steel production: CO monitoring in kiln preheater zones and blast furnace top gas for safety interlock integration
- Biogas upgrading: CH₄/CO₂ ratio feedback control in membrane separation and pressure swing adsorption units
FAQ
What gases can the UYI-U700 measure simultaneously?
The UYI-U700 is configured for single-gas measurement per optical channel. Multi-gas capability requires multiple laser modules or sequential scanning with shared optics—custom configurations are available upon technical review.
Is factory calibration traceable to national standards?
Yes. Each unit ships with a calibration certificate referencing NIST-traceable standard gases. Field recalibration uses certified reference materials per ISO 6141 and follows procedures aligned with ASTM D6299 for instrumental gas analysis.
Can the analyzer operate in high-humidity or particulate-laden streams?
Direct in-situ installation is limited to clean, low-particulate environments. For dirty streams, ONUEE provides application-engineered extractive sampling systems with heated probe housings, ceramic filtration, and condensate traps.
What is the recommended maintenance interval?
Under normal operating conditions, optical alignment verification and laser output power check are recommended annually; full system calibration is required no more than twice per year per manufacturer specifications and ISO/IEC 17025 guidance.
Does the UYI-U700 support FDA 21 CFR Part 11 compliance?
The embedded firmware supports electronic signatures, audit trail export, and user access controls. Full Part 11 compliance depends on site-specific validation protocols and IT infrastructure configuration—not inherent to the device alone.
