Abstract: The present disclosure relates to determining, in a fluid sample, particle(s) having a predetermined size or range of sizes within a detection zone using a particle detector, and includes: providing first and second lights to illuminate the sample within the detection zone; the first light being: a first polarisation at a first wavelength; a single wavelength having a first polarisation; or an unpolarised first wavelength; the second light being: a second polarisation at a second wavelength; the single wavelength having a second polarisation; or an unpolarised second wavelength; first sensor means obtaining a first response signal responsive to the first light impinging a particle; a second sensor means obtaining a second response signal responsive to the second light impinging a particle; determining a light scattering intensity at each light and a quotient thereof; and determining size of particle(s) by correlating light intensity values with values in a look-up table.

Abstract: An aspirating smoke detector detects blockages and interruptions in a pipe system. Air is aspirated, by a ventilator and via the pipe system, from rooms and devices that are to be monitored, and monitoring takes place for any characteristics of burning. The air flow of at least one part of the aspirated air is measured, as is the air temperature. A blockage signal is emitted if the air flow falls below a predetermined lower limit value and/or an interruption signal is emitted if the air flow rises above a predetermined upper limit value. The rotational speed of the ventilator is increased as air temperature rises and reduced as air temperature lowers.

Abstract: Particles to be detected are irradiated by first wavelength light and second wavelength light. The light that is scattered by the particles is converted into a first and second scattered-light signals. The two scattered-light signals are normalized with respect to one another such that the amplitude profile thereof approximately corresponds to larger particles such as dust and steam. Furthermore, an amplitude ratio is formed between the two scattered-light signals and an amplitude comparison value (90%) is set, which corresponds to a predeterminable particle dimension in the cross-over region between smoke and dust/steam. Mainly the first scattered-light signal is evaluated if the amplitude ratio exceeds the amplitude comparison value (90%) and a dust/steam-density signal is emitted. In the other case, mainly the second scattered-light signal that is evaluated and a smoke-density signal is emitted.

Abstract: An aspirating smoke detector detects blockages and interruptions in a pipe system. Air is aspirated, by a ventilator and via the pipe system, from rooms and devices that are to be monitored, and monitoring takes place for any characteristics of burning. The air flow of at least one part of the aspirated air is measured, as is the air temperature. A blockage signal is emitted if the air flow falls below a predetermined lower limit value and/or an interruption signal is emitted if the air flow rises above a predetermined upper limit value. The rotational speed of the ventilator is increased as air temperature rises and reduced as air temperature lowers.

Abstract: Particles to be detected are irradiated by first wavelength light and second wavelength light. The light that is scattered by the particles is converted into a first and second scattered-light signals. The two scattered-light signals are normalized with respect to one another such that the amplitude profile thereof approximately corresponds to larger particles such as dust and steam. Furthermore, an amplitude ratio is formed between the two scattered-light signals and an amplitude comparison value (90%) is set, which corresponds to a predeterminable particle dimension in the cross-over region between smoke and dust/steam. Mainly the first scattered-light signal is evaluated if the amplitude ratio exceeds the amplitude comparison value (90%) and a dust/steam-density signal is emitted. In the other case, mainly the second scattered-light signal that is evaluated and a smoke-density signal is emitted.

Abstract: The present invention relates to the field of the detection, analysis and/or determination of matter or particles suspended in fluid. In one particular form, the present invention relates to smoke detectors, which detect unwanted pyrolysis or combustion of material. In another form, the present invention relates to smoke detectors of the early detection type, and which may be applied to ventilation, air-conditioning or duct monitoring of a particular area. In yet another form, the present invention relates to adjusting the sensitivity of particle detectors.

Abstract: The present invention relates to the field of the detection, analysis and/or determination of matter or particles suspended in fluid. In one particular form, the present invention relates to smoke detectors, which detect unwanted pyrolysis or combustion of material. In another form, the present invention relates to smoke detectors of the early detection type, and which may be applied to ventilation, air-conditioning or duct monitoring of a particular area. In yet another form, the present invention relates to surveillance monitoring, such as building, fire or security monitoring. In still another form, the present invention relates to environment monitoring, such as monitoring, detection and/or analysis of a fluid, zone, area and/or ambient environment, including commercial and industrial environments.

Abstract: The present invention relates to the field of the detection, analysis and/or determination of matter or particles suspended in fluid. In one particular form, the present invention relates to smoke detectors, which detect unwanted pyrolysis or combustion of material. In another form, the present invention relates to smoke detectors of the early detection type, and which may be applied to ventilation, air-conditioning or duct monitoring of a particular area. In yet another form, the present invention relates to surveillance monitoring, such as building, fire or security monitoring. in still another form, the present invention relates to environment monitoring, such as monitoring, detection and/or analysis of a fluid, zone, area and/or ambient environment, including commercial and Industrial environments.

Abstract: The present invention relates to the field of the detection, analysis and/or determination of matter or particles suspended in fluid. In one particular form, the present invention relates to smoke detectors, which detect unwanted pyrolysis or combustion of material. In another form, the present invention relates to smoke detectors of the early detection type, and which may be applied to ventilation, air-conditioning or duct monitoring of a particular area. In yet another form, the present invention relates to adjusting the sensitivity of particle detectors.

Abstract: The present invention relates to the field of the detection, analysis and/or determination of matter or particles suspended in fluid. In one particular form, the present invention relates to smoke detectors, which detect unwanted pyrolysis or combustion of material. In another form, the present invention relates to smoke detectors of the early detection type, and which may be applied to ventilation, air-conditioning or duct monitoring of a particular area. In yet another form, the present invention relates to surveillance monitoring, such as building, fire or security monitoring. In still another form, the present invention relates to environment monitoring, such as monitoring, detection and/or analysis of a fluid, zone, area and/or ambient environment, including commercial and industrial environments.

Abstract: The present invention relates to the detection of particles suspended in fluid particularly smoke detectors suitable for mounting on ducting for the early detection of smoke created by unwanted pyrolysis or combustion of materials in a protected area or fire zone to which the duct is connected. The present invention provides alternately illuminating a detection zone with one of either a first or a second illumination. The improvement embodied in the current invention is the ability to retain sensitivity to a wide range of particle sizes and also to discriminate between different kinds of smoke or dust according to particle size, whilst also achieving relatively long service life, small size, light weight and low cost.

Abstract: The present invention relates to the detection of particles suspended in fluid particularly smoke detectors suitable for mounting on ducting for the early detection of smoke created by unwanted pyrolysis or combustion of materials in a protected area or fire zone to which the duct is connected. The present invention provides alternately illuminating a detection zone with one of either a first or a second illumination. The improvement embodied in the current invention is the ability to retain sensitivity to a wide range of particle sizes and also to discriminate between different kinds of smoke or dust according to particle size, whilst also achieving relatively long service life, small size, light weight and low cost.

Abstract: The present invention relates to the detection of particles suspended in fluid particularly smoke detectors suitable for mounting on ducting for the early detection of smoke created by unwanted pyrolysis or combustion of materials in a protected area or fire zone to which the duct is connected. The present invention provides alternately illuminating a detection zone with one of either a first or a second illumination. The improvement embodied in the current invention is the ability to retain sensitivity to a wide range of particle sizes and also to discriminate between different kinds of smoke or dust according to particle size, whilst also achieving relatively long service life, small size, light weight and low cost.

Abstract: A manifold valve assembly for use in a smoke/pollution detection system in which gas is drawn from a plurality of zones under surveillance and delivered to a smoke/pollution detector. The assembly has a manifold provided with a plurality of inlet ports communicating with the zones and an outlet communicating with the detector. A valve within the housing is reciprocable between a first position in which the outlet communicates with all of said inlet ports and a second position in which only one of said inlet ports communicates with the outlet. The valve is rotated incrementally in response to its reciprocation to enable each of the inlet ports to communicate with the outlet successively.

Abstract: A sampling point (110) for use in a pollution/smoke detection system for fixture to an apertured panel in a building, this system including a plurality of said sampling points (110) for connection to an aspirated gas reticulation system for drawing gas from said sampling points (110) exposed to a space under surveillance, said sampling point including a portion (19) for securement to a retaining means (10) and a capillary tube (15a) communicating between the sampling point (110) and said aspirated gas reticulation system, the sampling point (110) having an orifice (116) of a predetermined size to communicate between an area to be surveyed and the gas reticulation system, said capillary tube (116) conforming to standard smoke detection requirements as to bore strength flexibility and crush resistance, said sampling point (110) being adapted to be fitted from either the visible or blind side of the apertured panel and including collapsible shroud means (17, 18) capable of passing through said apertured panel an