Teledyne Analytical Instruments

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Teledyne Analytical Instruments

• LGA 4000 Analyzer

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Overview

• Theory of Operation
• Electromagnetic Spectroscopy
• Laser Tunable Diode
• Wavelength Selection
• LGA 4000 In-situ Analyzer
• LGA 4000 Extractive Analyzer
• Instrument Specifications
• Applications

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Theory of Operation

• Electromagnetic Spectroscopy

DE hn

• Molecules absorb EM radiation
• Raise energy level of electrons at certain
  wavelengths
• Each molecule has unique frequency response

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Theory of Operation

• Emit EM radiation through sample gas
• Measure absorbance A log10 (Io/It)
• Beer Lambert Relationship
• Aebc
• emolar absorption
• bpath length
• cgas concentration

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Theory of Operation

• Diode Laser Absorption Spectroscopy
• Monochromatic bandwidth
• Bandwidth 0.0001nm
• Adjust laser temperature, current

6
Theory of Operation

• Laser spectral scan is larger than gas absorption
  spectral line width
• Reference signal is compared to sample gas signal
• Calculation of TTb/Ta provides accurate
  concentration measurement

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Theory of Operation
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Theory of Operation

• Spectral analysis of background gases and sample
  gas
• Frequency must be found such that only sample gas
  is attenuated

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LGA 4000 In-Situ Analyzer
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LGA 4000 In-Situ Analyzer
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LGA 4000 Extractive Analyzer
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Analyzer Specifications
In-Situ System
Extractive System

• Optical Path Length lt 15m
• Response Time lt 1s
• Linear Accuracy lt /-1 FS
• Span Drift lt /- 1 FS
• Calibration 2/year
• Enclosure IP65
• Explosion Proof Expxmd IICT5
• Power 24VDC/110VAC/220VAC
• Ambient Temperature -30 to 60C

• Optical Path Length 0.5m or 1.1m
• Response Time lt 5s (T90)
• Gas Temperature -30 to 140C
• Gas Pressure 0.5 to 3 Bara

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Applications
Gas LDL Range Gas LDL Range
O2 0.01 Vol. 0-1 Vol., 0-100 Vol. CO 40 ppm 0-8000 ppm, 0-100 Vol.
CO2 20 ppm 0-2000 ppm, 0-100 Vol. H2O 0.03 ppm 0-3 ppm, 0-70 Vol.
H2S 2 ppm 0-200 ppm, 0-30 Vol. HF 0.01 ppm 0-1 ppm, 0-10000 ppm
HCL 0.01 ppm 0-7 ppm, 0-8000 ppm HCN 0.2 ppm 0-20 ppm,0-1 Vol.
NH3 0.1 ppm 0-10 ppm, 0-1 Vol. CH4 10 ppm 0-200 ppm, 0-10 Vol.
C2H2 0.1 ppm 0-10 ppm, 0-70 Vol. C2H4 1.0 ppm 0-100 ppm, 0-70 Vol.