ABB LS4000 Diode laser analyzer
ABB LS4000 Diode laser analyzer
Introduction Application and design The LS4000 is an in situ cross-duct analyzer for measuring gas component concentrations. It applies the highly selective optical measuring principle of tunable diode laser (TDL) ab sorption spectroscopy. The LS4000 is a stand-alone system which consists of a transmitter unit with a laser light source and a receiver unit with a photodetector. Both units are mounted opposite each other on the process pipe or stack and are connected by a junction box. Measuring principle – TDLAS The LS4000 employs the optical measuring technique of absorption spectroscopy, which utilizes the fact that a specific gas absorbs specific light wavelengths. The light beam is emitted from a tunable laser diode located in the transmitter unit. The laser light passes through the process gas and strikes the photodetector in the receiver unit. The measured gas component present in the optical path absorbs the laser light, attenuating the light received. A sophisticated signal algorithm processes the amount of light attenuation and calculates the gas concentration on the basis of the Beer-Lambert law. The influence of temperature and pressure variations is eliminated by dynamic automatic correction.
Measurement components and measurement ranges NH3, H2O, NH3 + H2O Min./max. measurement range NH3 0–10/0–1000 ppm Min./max. measurement range H2O 0–10/0–50 vol.-% Max. abs. pressure 0.5–1.7 bar (7–24 psi) Max. temperature 450 °C (842 °F) Optical path lengths (OPL) 0.5–5 m (1.6–16.4 ft) H2O Min./max. measurement range 0–10/0–50 vol.-% Max. abs. pressure 0.5–1.7 bar (7–24 psi) Max. temperature 450 °C (842 °F) Optical path lengths (OPL) 0.5–5 m (1.6–16.4 ft)
Process purging Depending on the application, purging on the process side is typically necessary. It is not required to purge the instrument housing. Available flange size DN 50 / PN 10, ANSI 2 in.-150 lb, JIS 10K 50A Material Flanges: AISI 304 (1.4301), standard AISI 316L (1.4404), optional O-rings (process): FPM (standard), FFKM Weight 3,1 kg Gas port for purging 1/4 in. Swagelok connectors for tubes with 8 mm outer diameter. Purging medium Instrument air (dry and oil-free, compliant with standard ISO 8573.1, Class 2–3) or nitrogen (depending on the application) Electrical interfaces Analog outputs Up to three 4–20 mA outputs (one for each measurement component and transmission), working resistance max. 500 Ω, not isolated Analog inputs Up to two 4–20 mA inputs for dynamic process temperature and pressure correction, working resistance max. 100 Ω, not isolated Digital outputs Up to two digital outputs, 1 A at 30 V DC/AC, NO, for error and gas alarm Service port Ethernet See page 8 for connection drawing.
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