Abstract: Various embodiments of the present disclosure provide a sampling device, system, and method. The sampling device includes a sample inlet nozzle fluidly coupled to a dilution body. A carrier fluid delivery conduit is also fluidly coupled to the dilution body. In one implementation, the carrier fluid delivery conduit is coupled to a source of heated carrier fluid. Carrier fluid is delivered around a perforated portion of the sample inlet nozzle, in one configuration. In some cases, the sampling device includes a mixing device configured to produce laminar flow of carrier fluid about a fluid sample. In other cases, the mixing device produces turbulent flow of carrier fluid and fluid sample. Systems including the sampling device include, in some implementations, a sample separator, such as an inertial droplet separator. In further implementations, systems including the sampling device further include an atmospheric dispersion simulator.

Abstract: In accordance with one embodiment of the present invention, an apparatus for separating a particulate-containing gas flow into particulate and substantially non-particulate flow portions is provided. The apparatus comprises a sample gas inlet, a radial separating ring, a separation draw, a separated gas outlet, a bypass eductor, and a bypass gas outlet. The radial separating ring comprises a separating ring gap defined between an inlet ring orifice and an outlet ring orifice, and is positioned such that a sample gas flow moving downstream from the sample gas inlet through the bypass eductor to the bypass gas outlet passes across the separating ring gap. The radial separating ring is configured such that the inlet ring orifice and the outlet ring orifice are relatively large, in relation to the size of the separating ring gap, and are positioned in close proximity to each other along the direction of the sample gas flow.

Abstract: Dilution stack sampling apparatus, for analyzing gaseous components of a gas stream from a stack containing particulate material of varying size therein. A passageway has a first end communicating at an angle with the probe intermediate its ends to receive a sample of gas and to change its flow direction to inertially remove most of the particulate material. An eductor connected to the second end of the passageway mixes dilution air with the sample of gas to provide a diluted sample. A filter upstream of the second end of the passageway removes remaining particulate material from the sample of gas which is not the inertially separated. Instrument air can be provided in a back-flow direction at the upstream side of the filter to periodically remove particulate material from the filter. The diluted sample and the dilution gas are supplied to gas analyzer, and the mass flow rate of the dilution gas and diluted gas are measured.

Abstract: A photometric analyzer for measuring differential total reduced sulfur in a sample gas stream is provided. It includes a supply for a sulfur bearing gas sample, an oven having an inlet connected to the supply for converting TRS to SO.sub.2 and an outlet through which the gas sample is discharged. A valve is connected to the outlet of the oven. An SO.sub.2 bypass line is connected between the supply and the valve. A sample cell with transparent ends has an inlet adjacent one end connected to the valve for alternately receiving sample gas from either the oven or the bypass line and has an outlet adjacent the other end. A pump connected to the sample cell outlet draws the gas sample through the sample cell. A light source at the one end of the sample cell directs light of a predetermined wave length through the sample cell. A light sensing device at the other end detects the amount of light passing through the sample cell at any given time and provides an output signal to an analyzer.

Abstract: Sample air is divided into two paths. One path leads through a thermal converter where ambient NO.sub.2 is changed into NO. The other path passes through equivalent tubing to keep the air samples synchronized. Both samples then go to separate cells where each combines with ozone. The resulting chemical reaction produces light, chemiluminescence, which is measured by separate photo-multiplier tubes. Electronic circuits translate the results into simultaneous readings of NO.sub.x and NO concentrations. A difference amplifier subtracts the NO from the NO.sub.x to give a continuous NO.sub.2 value.