Abstract: An electrode for use in industrial processes is provided with a mark. The marking apparatus comprises an information unit for providing a mark (110) representing some form of information relating to the electrode (100). The mark is arranged as a part of the electrode. A corresponding electrode mark reading apparatus for providing information related to an electrode includes a radiation unit for directing radiation towards the electrode, a detection unit for detecting radiation reflected by or transmitted through at least a part of the electrode, and for converting the detected radiation into a converted signal. A decoding unit is adapted to transform the converted signal into a decoded signal. A part of the decoded signal is related to a mark on the electrode. Conversion elements for converting the decoded signal into an electrode code is provided for obtaining code representing a feature related to the electrode.

Abstract: Gas detection or monitoring apparatus mainly comprising, an optical source unit including a tunable diode laser, an optical detection unit including a light sensitive detector, the source and the detector being arranged so that light from the source propagates through a gas measurement volume prior to being received by the detector, and the source being adapted to scan the light wavelength across one or more expected absorption lines of gases in the measurement volume, a control and processing unit for control and modulation of the source and processing of the detected signal and for calculating at least one digital value representing (a) gas concentrations in the gas measurement volume, wherein said control and processing unit is coupled to the source via a digital-to-analogue (D/A) converter, and the detector output signal is coupled to the input of an analogue-to-digital (A/D) converter, and the output of the A/D converter is coupled to the processing unit.