Opsis Ab

Svante Wallin

Leif Uneus

The present invention relates to a method () for determining a content of HS in a process gas comprising HS. The method () comprises extracting () a sample of the process gas, performing oxidation () of at least a major portion of HS of the sample, whereby oxidation products comprising elemental sulfur are formed, analysing () the oxidized sample by optical absorption spectroscopy at wavelengths above 310 nm, and determining () the content of HS in the process gas based on the analysing. The invention further relates to a system () for determining a content of HS in a process gas comprising HS, and use of system ().

Method and system for determining a content of HS

A device for radiation absorption measurements may include a radiation source emitting electromagnetic radiation having a wavelength in the interval 0.2 &#x3bc;m-20 &#x3bc;m, a detector detecting the electromagnetic radiation, when in a measurement mode at least a portion of the radiation has passed through a medium and been reflected by a surface at a distance from the radiation source, before reaching the detector. The device may further include a fluid calibration cell, which is adapted to be arranged in the path of the electromagnetic radiation between the radiation source and the detector. A method for calibrating a device for radiation absorption measurements may involve emitting electromagnetic radiation having a wavelength in the interval 0.2 to 20 &#x3bc;m, directing at least a portion of the electromagnetic radiation through a fluid calibration cell, and detecting the electromagnetic radiation.

Device for radiation absorption measurements and method for calibration thereof

Optical analysing equipment includes a light source, a light receiver and an optical arrangement for producing a measuring beam and a calibrating beam from the light of the light source. A calibrating channel and a measuring channel extend form the light source to the light receiver. The light source and the light receiver can be arranged on opposite sides of the duct. In this case, the calibrating channel and the measuring channel include two tubes extending in parallel across the duct between the light source and the light receiver. The light source and the light receiver can alternatively be arranged on the same side of the duct. In this case, the measuring channel extends partially into the duct. The calibrating channel may then extend into the duct or be positioned entirely outside the duck. By light control means, the light receiver receives either the measuring beam or the calibrating beam.

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Bjärred, Sweden

Svante Wallin