A smoke detector for an air duct includes a photoelectric detection system and a sampling space in fluid communication with the air duct wherein the sampling space is enclosed by a removable sampling space enclosure having an optic window, and the photoelectric detection system is located adjacent to the optic window. The sampling space enclosure can be removed or replaced without removing or replacing the entire smoke detector.

A method for determining a chance to enable a zeroing of gas analysis is disclosed herein. The method includes emitting radiation, and receiving emitted radiation, the received radiation comprising a first wavelength range absorbed by the at least one desired gas component and one or more disturbing factor, and a second wavelength range absorbed by the disturbing factor, the first wavelength range differing from the second wavelength range. The method also includes providing to a processing unit a first signal data indicative of a concentration of the at least one desired gas component and absorption of the disturbing factor, and a second signal data indicative of absorption of the disturbing factor. The method also includes determining a stability of the first and second signal data as a function of time, and if they are substantially stable enabling the zeroing to improve a measurement accuracy.

A system for analysis of vent gas of a urea plant, comprising: a Raman spectroscope; a sampling conduit that connects the spectroscope to a main pipe of the urea plant configured to convey a sample stream to be analysed to the spectroscope; and a temperature-adjusting device, operated by a temperature controller and acting on at least one thermal treatment portion of the conduit configured to adjust the temperature of the sample stream circulating in the conduit.

An inhalation device for inhaling a vaporized substance that includes metering capabilities to inform a user when a particular amount of substance has been consumed. The inhalation device can include a sensor that senses the vaporized substance and a processor that utilizes data from the sensor to meter the amount consumed. The inhalation device can also define a session, which is a time in which a user can consume a particular amount. During the session, a user can start and stop inhaling and resume inhaling. When the user stops inhaling the inhalation device will halt vapor production and will resume production when the user resumes inhaling.

A system and method for compositional analysis of a process stream in an industrial process transports a liquid process stream through an absorption/desorption packed column (A/D column), along with a carrier gas. A gas phase combination of the carrier gas and one or more solutes from the liquid process stream is passed out of the A/D column to a flow cell for analysis by an analyzer to determine presence and concentration of the one or more solutes within the gas phase. A processor uses the concentration of the solutes within the gas phase to perform a headspace analysis to determine the concentration of the solutes in the process stream.

A laser gas analyzer includes a light emitter which emits a laser light irradiated onto a gas to be measured; a light receiver which receives a laser light which transmitted the gas to be measured; a plurality of optical-axis adjustment mechanisms, one of which is provided in the light emitter and the other one of which is provided in the light receiver; a main display which is provided in one of the light emitter and the light receiver and displays thereon the measured result acquired by receiving the laser light which transmitted the gas to be measured; and a sub-display which is provided in the other one of the light emitter and the light receiver and displays thereon a part of the measured result displayed on the main display.

An apparatus includes: measurement flow passage portions as part of a respective plurality of supply paths of fluids to be supplied to a substrate, the measurement flow passage portions constituting measurement regions for measurement of foreign matter in the fluids, and being disposed so as to form a row with each other; a light irradiating unit configured to form an optical path in one of the flow passage portions, the light irradiating unit being shared by the plurality of flow passage portions; a moving mechanism configured to move the light irradiating unit relatively along a direction of arrangement of the flow passage portions to form the optical path within the flow passage portion selected among the plurality of flow passage portions; a light receiving unit including a light receiving element, the light receiving element receiving light transmitted by the flow passage portion; and a detecting unit configured to detect foreign matter in the fluid on a basis of a signal output from the light receiving element. Consequently, the number of necessary light irradiating units can be reduced, and the apparatus can be miniaturized.

Process for measuring emission for a flame in an open combustion environment. A captured image is received from each of a plurality of image capturing devices in at least one selected spectral band. Each of the plurality of image capturing devices is trained on the flame from the combustion process from a different perspective view angle. A spectral path length of the flame in the at least one spectral band is estimated from the captured images. Emitted radiance of the flame is estimated from the captured images, and a temperature of the flame is estimated from the estimated emitted radiance. A gas species concentration of the flame is estimated from the temperature of the flame and the spectral path length of the flame. Emission for the flame is measured from the gas species concentration.

A method of determining the concentration of a species in a portion of a furnace atmosphere is described. The method comprises the steps of measuring first, second and third intensities of electromagnetic radiation in the furnace at first, second and third wavelengths respectively. The third wavelength is selected to be representative of absorption of electromagnetic radiation by the species. A fourth intensity of electromagnetic radiation is calculated, being an estimate of the intensity of electromagnetic radiation in the furnace at the third wavelength absent any absorbing species in the furnace atmosphere. The third intensity and the fourth intensities are used to determine a parameter that is proportional to the concentration of absorbing species in the portion of the furnace atmosphere. Apparatus for carrying out the method is also described.

Gas detection apparatus for the detection of a target gas in a gas mixture, having a radiation source, a first measurement chamber and a second measurement chamber, as well as a first and second measurement detector. A first gas mixture flows through the first measurement chamber, and a second gas mixture flows through the second measurement chamber. Electromagnetic radiation emitted by the radiation source passes initially through the first measurement chamber and subsequently through the second measurement chamber. The first measurement detector registers a physical effect in the first measurement chamber, this physical effect correlating with the intensity of the radiation passing through the first measurement chamber, and generates a first signal correlating with the physical effect. The second measurement detector is correspondingly configured for the second measurement chamber. A second measurement point is thus provided without requiring a second radiation source.