Embodiments of a continuous dust accumulation monitoring system comprise an enclosure adapted for use in electrical hazardous locations, a sample area for collecting ambient dust, a dust accumulation sensor assembly installed in the enclosure configured to generate a signal based on the amount of ambient dust collected on the sample area and a circuit board within the enclosure configured to receive the signal from the dust accumulation sensor assembly. The continuous dust accumulation monitoring system may be connected to system control hardware.

Embodiments of a continuous dust accumulation monitoring system comprise an enclosure adapted for use in electrical hazardous locations, a sample area for collecting ambient dust, a dust accumulation sensor assembly installed in the enclosure configured to generate a signal based on the amount of ambient dust collected on the sample area and a circuit board within the enclosure configured to receive the signal from the dust accumulation sensor assembly. The continuous dust accumulation monitoring system may be connected to system control hardware.

The objective of the present invention is to provide a particle detection device and a particle detection method that can individually and continuously detect a wide range of particles. The objective is achieved by a particle detection device including: a particle separation channel through which particles are separated according to particle sizes in a perpendicular direction to the flow of fluid; and two or more particle recovery channels that are connected to and branched from the particle separation channel, in which each of the particle recovery channels includes a particle detection unit that includes an aperture and an electric detector.

The present invention relates to methods and systems for testing for the presence of a material such as one or more analyte types within a sample and more particularly, for improved single enzyme-linked immunosorbent assay (sELISA) testing as well as other variants of single-enzyme linked molecular analysis (SELMA). Background and false positives are reduced due to the presence of at least two detection cycles where each detection cycle comprises the steps of a) triggering a signal from captured and labelled analyte(s), b) recording of the number and positions of capture sites exhibiting a signal from the captured and labelled analyte(s), c) and before a further detection cycle is performed, deactivation of signal(s).

Embodiments of a continuous dust accumulation monitoring system comprise an enclosure adapted for use in electrical hazardous locations, a sample area for collecting ambient dust, a dust accumulation sensor assembly installed in the enclosure configured to generate a signal based on the amount of ambient dust collected on the sample area and a circuit board within the enclosure configured to receive the signal from the dust accumulation sensor assembly. The continuous dust accumulation monitoring system may be connected to system control hardware.

A method of determining the condition of a metal powder for use in an additive manufacturing process, involving processing an image of the powder to measure a surface property of the powder, such as colour, texture or particle shape. The proportion of powder whose measured surface property falls outside a pre-determined range is determined and can be used to decide whether or not the powder is suitable for re-use. The proportion is determined by identifying individual particles in the image which are identified as statistical outliers amongst all of the particles shown in the image when considering a measured surface property. The relevant proportion may be determined statistically.

The invention as herein described discloses a test apparatus (1) for testing dust suppression systems and a method for testing dust suppression systems using said test apparatus (1). Said test apparatus (1) comprises a housing (100) with at least two chambers (101,102) being separated from each other by a window (103) which comprises at least one transfer vent (104). Therein particle counting means (110, 120) are detachably mounted to at least one of said two chambers (101,102). Further, the first chamber (101) of said at least two chambers (101,102) comprises a door (121) and is equipped with supply means for supplying the first chamber (101) with particulate free air, and wherein the second chamber (102) of said at least two chambers (101, 102) is equipped with exit means for releasing air from the second chamber (102).

Provided is an apparatus for measuring particulate matter, the apparatus including an air inflow device configured to receive air including particulate matter particles, two or more light sources configured to respectively emit light of different wavelengths to the air received, a pattern measuring device configured to measure scattering patterns for each wavelength of light based on detecting light that is forward-scattered by the particulate matter particles and light that is back-scattered by the particulate matter particles, and a processor configured to obtain a size of the particulate matter particles and a concentration of the particulate matter particles based on the scattering patterns for each wavelength of light.

This invention relates to a method of evaluating a squeegeeing property of powder for lamination shaping by stable criteria. In this method, the squeegeeing property is evaluated using at least a satellite adhesion ratio of the powder and an apparent density of the powder. The satellite adhesion ratio is the ratio of the number of particles on which satellites are adhered to the number of all particles. If the satellite adhesion ratio is equal to or less than 50%, and the apparent density is equal to or more than 3.5 g/cm.sup.3, the squeegeeing property is evaluated as that the powder can be spread into a uniform powder layer in the lamination shaping. Furthermore, if the 50% particle size of a powder obtained by a laser diffraction method is 3 to 250 m, the squeegeeing property is evaluated as that the powder can be spread into a uniform powder layer in the lamination shaping.

The present invention intends to provide a method by which the scattering property of a powder can be more clearly evaluated. There is provided a method for evaluating a scattering property of a powder, the method including dropping a powder to be evaluated onto a liquid placed in a box, thereby scattering the powder as dust in the box, and measuring a dust concentration in air in the box with a dust meter. There is also provided an apparatus for evaluating a scattering property of a powder, the apparatus including a box in which a liquid is to be placed, and a dust meter that measures a dust concentration in air in the box when the powder to be evaluated drops onto the liquid placed in the box and scatters as dust.