Analyzer LaserGas™ Q SO2 (QCL)


NEO Monitors LaserGas™ Q SO2 (QCL edition) is using Tuneable Laser AbsorptionSpectroscopy(TLAS) i.e a non-contact optical measurement method employing solid-state laser sources. The sensor remains unaffected by contaminants corrosives and does not require regular maintenance. The absence of extractive conditioning systems further improves availability of the measurements and eliminates errors related to sample handling. The  monitor is mounted directly onto flanges, which include purge gas connections and a tilting mechanism for easy alignment. Continuous purge flow prevents dust and other contamination from settling on the optical windows. Once power and data lines are connected, measurements are performed in real-time.

Technical data

Optical path length: Typically 0.5 – 6 m
Response time: Typically 10 – 20 sec (other response time on request)
Accuracy: Application dependet
Repeatability: 1% of range (gas & application specific)
Range SO2: 0 – 2000 ppm (other ranges on request)
Detection limit: 1 ppm
Temperature: 200 ºC – 400 ºC (other temperatures on request)
Pressure: 0.7 – 1.5 bar abs
Windows material: CaF2

Environmental conditions
Operating temperature: -20 ºC to +55 ºC
Storage temperature: -20 ºC to +55 ºC
Protection classification: IP66

Inputs / Outputs
Analog output (3): 4 – 20 mA current loop (concentration, transmission)
Digital output: RS – 232 format, Optional 10 or 10/100 Base T Ethernet, Optional fiber optic (ASCII – format)
Relay output (3): High gas-, Maintenance-, Warning – and Fault relays (normally closed-circuit relays)
Analog input (2): 4 – 20 mA process temperature and pressure reading

Input power supply unit: 100 – 240 VAC, 50/60 Hz
Output power supply unit: 24 VDC, 900 – 1000 mA
Input transmitter unit: 18 – 36 VDC, max. 20W
4 – 20 mA output: 500 Ohm max. isolated
Relay output: 1 A at 30 V DC/AC

Installation and Operation
Flange dimension alignment: DN50/PN10 or ANSI 2’’/150lbs (other dimensions on request)
Alignment tolerances: Flanges parallel within 1.5°
Purge flow: Dry and oil-free pressurised air or nitrogen 10 – 50 l/min (application dependent)
Purging of laser: Clean dry air, ≈ 15 l/min (Mandatory)
Purging of windows: Dry and oil-free pressurized air or gas, or by fan

Visual inspection: Recommended every 6 – 12 months
Calibration: Check recommended every 12 months

Laser class: Class 1 according to IEC 60825-1
CE: Certified
EMC: Conformant with directive 2014/30/EU

Dimension and weight
Transmitter unit: 340 x 270 x 170 mm, 6.9 kg
Receiver unit: 260 x 270 x 170 mm, 5.5 kg
Power supply unit: 180 x 85 x 70 mm, 1.6 kg

Additional information


NEO Monitors


Cement plants, Chemical and petrochemical industry, Coke plants and steelworks, Gas industry, Heavy industry, Laboratories and research institutes, Power and heat, Production of technical gases, Sugar-factory, Waste incineration plants

Measured parameters

Sulfur dioxide (SO2)