Technical Specifications:

• Measurement Gas: O2 (Oxygen)
• Measurement Principle: TDLAS (Tunable Diode Laser Absorption Spectroscopy) at 760 nm wavelength
• Measurement Range: 0 to 25% O2 (configurable, typical: 0–5%, 0–25%)
• Accuracy: ±0.1% of reading (0 to 25% O2 range)
• Resolution: 0.01% O2
• Response Time (T90): ≤2 seconds
• Sample Temperature: -20°C to +150°C (in-situ, no sample conditioning required)
• Sample Pressure: 0.1 to 2.0 MPa (absolute)
• Process Connection: 1/2″ NPT male (standard), flange options available (DN50, DN80)
• Output Signal: 4 to 20 mA DC (HART 7), RS-485 (Modbus RTU)
• Laser Source: Distributed Feedback (DFB) laser diode, 760 nm, single-mode
• Optical Path Length: Up to 30 m (multipass cell, in-situ installation)
• Protection Rating: NEMA 4X / IP66 (analyzer housing)
• Power Supply: 100 to 240 V AC, 50/60 Hz (analyzer electronics)
• Laser Safety Class: Class 1 (enclosed beam path — safe for all operating conditions)

Functional Features:

• Zero cross-sensitivity to CO2, H2O, CO, NOx — TDLAS measures only O2 absorption line
• In-situ installation — laser beam passes directly through the process, no sample extraction needed
• Automatic alignment verification — built-in reference channel monitors optical alignment drift
• HART 7 communication — remote configuration, calibration, and diagnostics
• Dual-wavelength reference — compensates for window fouling and dust buildup
• Built-in data logger — stores up to 10,000 data points with timestamps

Performance Parameters:

Material Composition:

• Analyzer Housing: 316L Stainless Steel (electropolished, Ra ≤ 0.4 μm)
• Optical Windows: Sapphire (Al2O3) — transmission >85% at 760 nm, hardness 9 Mohs
• Laser Module Housing: Aluminum alloy with gold-plated thermal interface
• Cable Gland: 316L Stainless Steel with nickel plating, IP68 rated
• Internal Optics: Gold-coated mirrors, ZnSe beam splitter (anti-reflection coated at 760 nm)

Structural Characteristics:

• Dimensions: 280 mm (W) × 350 mm (H) × 220 mm (D) (analyzer head)
• Weight: Approximately 12 kg (analyzer head only, excluding mounting bracket)
• Mounting: Pipe-mount (1/2″ NPT) or flange-mount (DN50/DN80)
• Optical Access: Front-facing (transmitter/receiver pair, 30 m path, retro-reflector at opposite side)
• Display: 128 × 64 pixel LCD with white backlight, 4-line text + real-time bar graph

Working Principle:
The YS1700 emits a narrow-linewidth laser beam at 760 nm, precisely tuned to an O2 absorption line. The beam travels through the process gas along a multipass optical path (up to 30 m effective length) using a retro-reflector mounted on the opposite side of the duct/pipe. O2 molecules absorb a fraction of the laser light proportional to their concentration (following the Beer-Lambert Law: I = I0 × e^(−αCL), where α = absorption coefficient, C = concentration, L = path length). A photodetector measures the transmitted intensity, and the microprocessor calculates O2 concentration by comparing it to a reference wavelength (non-absorbed) to compensate for window fouling and optical drift. The result is output as 4–20 mA + HART.

Key Advantages:

• TDLAS technology — zero cross-sensitivity — the gold standard for O2 measurement accuracy
• In-situ measurement — no sample conditioning, no lag time, no maintenance of sample systems
• Sapphire optical windows — resist fouling and corrosion in harsh combustion environments
• Class 1 laser safety — no laser safety interlocks or restricted areas required

Applicable Industries:

• Combustion optimization (boilers, furnaces, heaters, kilns)
• Safety monitoring (O2 deficiency/enrichment alarms in confined spaces)
• Cement plant kiln and preheater O2 control
• Glass furnace atmosphere control
• Steel reheat furnace optimization
• Waste incineration flue gas monitoring

Installation Requirements:

• Install retro-reflector on opposite side of duct/pipe, aligned within ±0.5° of laser beam axis
• Ensure optical path is clear of obstructions (no supports, brackets, or flow disturbances in the beam path)
• Mount analyzer head at ambient temperature 0°C to +55°C (electronics section)
• Process connection: 1/2″ NPT male — use PTFE tape (3 wraps) on threads
• Bond analyzer housing to plant ground (impedance < 1 Ω)
• Minimum duct/pipe diameter: ≥150 mm (for 30 m optical path)

Usage Precautions:

• Never look directly into the optical path when the laser is active — although Class 1, avoid intentional exposure
• Clean sapphire windows every 3 months in dusty/fouling environments using isopropyl alcohol and lint-free cloth
• Do not exceed 2.0 MPa process pressure — will damage optical window seal
• Verify zero calibration with N2 purge gas before commissioning (not with air, which has 20.9% O2)
• Perform span calibration with certified O2 gas mixture (e.g., 5% O2 in N2) at process temperature and pressure
• Store spare sapphire windows in original packaging — scratches reduce transmission permanently