AtLAS - Model 900 – Extractive -Tunable Diode Laser Absorption Spectroscopy (TDLAS) Analyser

• Oxygen [O2]
• Water [H2O]
• Hydrogen Fluoride [HF]
• Acetylene [C2H2]
• Carbon Monoxide [CO]
• Hydrogen Sulphide [H2S]
• Ammonia [NH3]
• Ethylene [C2H4]
• Carbon Dioxide [CO2]
• Hydrogen Chloride [HCl]
• Methane [CH4]

• Carbon Monoxide + Carbon Dioxide [CO+CO2]
• Ammonia + Water [NH3 + H2O]
• Hydrogen Chloride + Water [HCL + H2O]
• Hydrogen Fluoride + Water [HF + H2O]

High Performance

• Adopting wavelength-modulation-spectroscopy allows better signal/noise ratio and anti-interference capability of dust and background gas
• Single line spectrum technology, free from interference of background gas
• No cross sensitivity due to the presence of solvents
• Extremely high stability and repeatability
• Almost instantaneous response time

Easy to Use

• Modular design makes field maintenance operations very easy
• Simple to clean in case dirty deposits on the optical parts

Low Costs of Ownership

• It requires a simple sampling system
• No depleting or consumable parts that need to be periodically replaced or refilled

Interface

• I/O interface, self-diagnosis and alarm s
• Local OLED display with magnetic keys, operated by magnetic pen without opening the housing 

European Compliance

• Low Voltage Directive 2014/35/EU
• EMC Directive 2014/30/EU

ATEX

ATEX certification for Zone 1 / Zone 21 with protection mode:

• II 2 G DEx db op is IIC T6 Gb Ex
• Ex tb op is IIIC T80°C Db
• Ta = -20°C to +60°C
• ATEX Certificate Number CML 18 ATEX 1400X

SIL 2

• SIL 2 [ pending ]

Performance Specification

• Measuring Principle TDLAS (Tunable Diode Laser Absorption Spectroscopy)
• Light Source Semiconductor Laser
• Accuracy ≤ ±1% FS
• Linearity Error ≤ ±1% FS
• Repeatability ≤ ±1% FS
• Span Drift ≤ ±1% FS / 6 months
• Zero Drift ≤ ±1% FS / 6 months
• Maintenance Cycle ≤ 2 times / year (clean optical window)
• Calibration Cycle ≤ 2 times / year
• Enclosure Rating IP66
• Response Time ≤ 1 sec. at T90
• Optical Path Minimum 350 mm for O2

Signals

• Analog Output 2 x 4-20 mA isolated (max. load 750 Ω)
• Analog Input 2 x 4-20 mA isolated (for temperature and pressure compensation, if necessary)
• Digital Output RS485 / RS232
• Relay Output 3 x (24V, 1A)

Operative Specification

• Sample Flow Rate 2000 ÷ 5000 cc/min.
• Pressure Max. 3 bar abs.
• Power Supply 24 Vdc or 100…240 Vac, ≤ 20W
• Ambient Temperature -20°C….+60°C
• Ambient Humidity ≤ 90% non-condensing
• Installation Extractive
• Pneumatic Connections 2 x fittings for tube O.D. 8 mm (In / Out)
• Wiring Connections
• 1 x armored cable gland for cable 6.5÷10.5 mm.
• 3 x threaded hole M20 x 1.5 (with plug)
• 1 x threaded hole M25 x 1.5 (with plug)

Physical Specification

• Dimensions Refer to dimensional layout
• Weight 26 Kg. total
• Wet Parts Materials
• Analyser: K9/JGS2 Quartz, Teflon
• Analysis tube: SS 304 or SS304 Teflon-Coated

• Inerting Control
• Centrifuges
• Reactors
• Chemical and Pharmaceutical Industry
• Biogas & Landfill Gas
• Solvents Recovery
• Fertilizers

The AtLAS-900, configured as extractive, needs an external sampling system able to deliver the sample gas to the analyser. The sample gas only contacts Quartz and Teflon (or AISI) and this makes the analyser parts totally free from most of the aggressive substances. Again, there are not moving parts and the analyser can even withstand with the direct ingress of liquid and it can be sterilized.

The extremely simplified and resilient design allows to reduce to the minimum the sampling systems components upstream the analyser.

TDLAS (Tunable Diode Laser Absorption Spectroscopy) mainly uses the character that Tunable laser’s narrow band and wavelength change with the current. So, by precisely modulating the current of tunable laser, it can scan a certain absorption peak of detected gas (no absorption of background gas).

And after obtaining the second harmonics absorbed by detected gas, it finally works out the concentration of detected gas by using this second harmonics and line-width.

The TDLAS technology has been developed into a kind of high sensitivity, high resolution, fast response time and high selectivity of gas detection technology, widely used in industrial process monitoring control.

 By using a tunable semiconductor laser, AtLAS-900 scans the specific absorption line of the measured gas (no background gas) to get the second harmonic of the gas. Through processing and analyzing the second harmonic and the broadening information of the gas, the concentration of the gas is obtained.