NWSPEC

UV-DOAS Gas Analyzer

High-Precision Ultraviolet Differential Optical Absorption Spectroscopy for Emission Monitoring

Features

Integrated UV spectrometer, optical gas cell, UV light source, and proprietary algorithm — all independently designed and manufactured by NWSPEC
High spectral resolution for accurate gas identification
Excellent thermal stability and vibration resistance for harsh industrial environments
Modular design with optional spectral range and absorption path length configurations
Compact structure enables easy assembly and system integration
Simple USB-based software upgrades

Applications

Real-time analysis of UV-absorbing gases including SO₂, NO, and NO₂ for:

Industrial flue gas emission monitoring
Automobile exhaust analysis
Marine vessel emissions compliance
Odorous gas detection and control

Technical Specifications

Parameter	Specification	Notes
Target Gases	SO₂, NO	Expandable to NO₂
Measurement Principle	DOAS (Differential Optical Absorption Spectroscopy)	UV wavelength range
Measurement Range	0 – 200 ppm (SO₂, NO)	Custom ranges available
Detection Limit	0.01 ppm (SO₂/NO)	High sensitivity detection
Linearity Error	≤ ±1.5% F.S.	Full scale accuracy
Repeatability	≤ ±0.5% F.S.	Precision measurement
Zero Drift	≤ ±1.5% F.S./7 days	Long-term stability
Span Drift	≤ ±1.5% F.S./7 days	Minimal calibration required
Response Time (T90)	< 30 seconds	Rapid detection capability
Sample Flow Rate	1.0 L/min (optimal)	Continuous flow operation
Digital Outputs	2 source contacts + 3 dry contacts	Programmable max/min alarms
Communication Interface	Modbus RTU (RS485 default / RS232 optional)	Industrial standard protocol
Display	7-inch capacitive touchscreen, RGB color	Linux-based interface
Power Supply	220 VAC, 50 Hz	< 2A peak current
Power Consumption	< 60 W (average)	Energy efficient
Operating Temperature	0°C to +40°C	Industrial environment rated
Operating Humidity	0 – 95% RH (non-condensing)	Wide humidity tolerance
Atmospheric Pressure	86 – 108 kPa	Altitude compensation

System Architecture

The analyzer employs a robust UV-DOAS configuration featuring NWSPEC's proprietary spectrometer design, high-stability deuterium or xenon light source, and temperature-controlled optical gas cell. The integrated Linux-based control system provides local data logging, real-time concentration display, and seamless SCADA integration via Modbus protocols.

$1,000.00 USD