Conventional detection of acetylene primarily relies upon gas chromatograph (GC), which comes with a high cost of ownership, high requirements for operator expertise, intensive maintenance and slow (several minutes) measurement response times. This paper will introduce TDL analyzers SpectraSensors developed for C2H2 measurements in various stages of the ethylene production process. This paper will describe system design and present both lab experiment and field operation data for C2H2 measurements in the range of 0-10 ppmv, 0-100 ppmv and 0-5000 ppmv. Employing 2nd-harmonic (2f) spectroscopy, multipass Herriott cells, advanced spectroscopy analysis algorithms, a fast Reduced Instruction Set Computer (RISC) and compact modular sample handling systems, these analyzers have demonstrated fast response time (in seconds), superior detection sensitivity and reading repeatability. The analyzers achieved 3σ repeatability of better than ±50ppbv for 0-10 ppmv measurement range, better than +/- 2% of full scale for 0-100 ppmv and 0-5000 ppmv ranges.
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