Abstract: A mercury-free high-pressure metal-halide ultraviolet gas-discharge lamp comprising a primary filling of at least one of osmium, germanium and tellurium, and a secondary filling comprising at least one of tin, antimony, indium, tantalum and gold. In a preferred embodiment, the primary filling is TeI2 and the secondary filling is SbI3.

Abstract: A mercury-free high-pressure metal-halide ultraviolet gas-discharge lamp comprising a primary filling of at least one of osmium, germanium and tellurium, and a secondary filling comprising at least one of tin, antimony, indium, tantalum and gold. In a preferred embodiment, the primary filling is TeI2 and the secondary filling is SbI3.

Abstract: A device for conditioning a fluid flow in a duct around an irradiating element such as an UV element, comprising means for generating multiple vortices in a fluid flow wherein the generating means comprises a flow conditioning body with an orifice, whereby the orifice shape is defined by an inner edge of the body arranged such that the distance from the centre of the orifice to the inner edge of the body varies substantially sinusoidally around at least part of the inner edge of the body.

Abstract: A sensor housing (10) in which a radiation sensor can be inserted through a sensor aperture (28) has blocking means (30, 32) that can move between an open position and a closed position. When the blocking means (30, 32) are in the closed position they prevent radiation from passing out of the sensor aperture (28). The blocking means may take the form of shutters that that close when the radiation sensor is removed, thus stopping radiation from passing through the housing (10).

Abstract: A sensor housing (10) in which a radiation sensor can be inserted through a sensor aperture (28) has blocking means (30, 32) that can move between an open position and a closed position. When the blocking means (30, 32) are in the closed position they prevent radiation from passing out of the sensor aperture (28). The blocking means may take the form of shutters that that close when the radiation sensor is removed, thus stopping radiation from passing through the housing (10).

Abstract: A lamp mounting assembly that mounts a UV lamp within a flow control structure includes a mount assembly that mounts at an end of the flow control structure. The mount assembly includes a conductor housing receiving opening extending therethrough. A socket base structure includes a socket base and a conductor housing extending outwardly from the socket base. The conductor housing is sized to be received by the conductor housing receiving opening of the mount assembly. A lamp socket is connected to the conductor housing to allow an electrical connection between the lamp socket and a power source. The lamp socket has a lamp engaging surface arranged offset from vertical when mounted to the flow control structure.

Abstract: A transmission meter (1) and a method for measuring the transmittance of a fluid, the meter (1) comprises an analysis chamber for passage of the fluid therethrough, means for receiving an electromagnetic source (9) within said chamber and three sensors (D1, D2 and D3) each configured to measure the output from said source (9), wherein each of the three sensors (D1, D2 and D3) are located at different distances from the source (9). The transmission meter may be used in a disinfection system either to measure the transmittance of the untreated water or to measure the transmittance of the water as it is purified.

Abstract: The invention relates to measuring the ultra-violet radiation received from tubular ultra-violet source mounted within a quartz sleeve, the radiation passing through water within a tubular circuit coaxial with the source and sleeve. A sensor probe fits within a socket formed in the wall of the conduit. The probe comprises a plane quartz window at one end and an ultra-violet sensor tube at the other end. Radiation from the window passes through an iris, whose size and position are chosen so that the source projects an image through the iris which is at least twice the size of the sensitive area on the sensor. In order to minimize inconsistencies due to faulty positioning of the sensor tube, the axis of the tube is preferably at right angles to the axis of the source. The output of the sensor is connected with a logic circuit which has means for providing a multi-state indication of radiation within the conduit.

Abstract: The invention relates to apparatus 1 for monitoring the intensity of a UV source, for example a water sterilizer, in which there is an optical detection unit (2) which detects UV radiation and converts that radiation into an electrical signal which is comparable to the intensity of the UV radiation detected, the optical detection unit (2) being operatively connected with a device including a converter (8) and adapted to indicate the intensity of UV radiation from the source dependent on the electrical signal from the optical detection unit.