An apparatus for use in determining the presence and/or concentration of one or more selected materials in a matrix stream of materials within a process pipe, reactor or other process vessel, including (a) a support member having a first, internal end for inserting into the matrix stream when the apparatus is placed in service and a second end positioned externally of the pipe, reactor or other vessel in use, wherein the support member defines a groove therein of which at least a portion extends...

A sample processing system for use with analysis apparatus includes tubular structure that defines a continuous elongated flow chamber. The tubular structure has an inlet port at one end, an outlet port at the other end, and a sample inlet port in communication with the continuous elongated flow chamber between the inlet and outlet ports. A first pump flows diluent at a first rate through the inlet port for flow through the continuous elongated flow chamber, and a second pump flows a liquid mixt...

Gain control for an optical reader having a scanned photocell array producing a multiplexed analog signal stream by cyclically sampling the signals on channels leading from the cells in the array. A memory stores digital coded words, one word for each given channel with each word representative of the response characteristics of a given channel. A multibit digital-to-analog converter receives the multiplexed signal. In synchronism with multiplexing the signals, gain control words are read from m...

Apparatus and process provide qualitative and quantitative analysis of sample constituent(s) in a fluid, relatively free from qualitative ambiguities and quantitative zero displacements due to slowly changing contamination in the measurement stream. Slowly changing zero displacement in the stream is cancelled out by the taking of continuous measurements at two points along the stream and continuously manipulating the two measurements as by subtraction.

A sample injection system for a gas chromatograph or other analysis instrument is described. The sample injection system can be used in conventional gas chromatographs containing a detecting device and an internal heat source to provide temperature-programming capability for analyses involving thermal extraction of hydrocarbons and other gaseous products from a solid or liquid sample. The injection system includes a sample chamber having a sample inlet and an outlet, means to control the tempera...

A sample metering valve for both liquid samples and slurry samples with entrained gas bubbles. The sample metering valve for liquids is comprised of a piston with sample chambers formed in the side thereof said piston moving freely into and out of a cylinder having an aperture matching the size of the piston. Sealing is provided by a seal which has no dead volume which cold flows under a spring bias to maintain the seal under various operating conditions. The sample metering valve for slurry sam...

A sample metering valve for both liquid samples and slurry samples with entrained gas bubbles. The sample metering valve for liquids is comprised of a piston with sample chambers formed in the side thereof said piston moving freely into and out of a cylinder having an aperture matching the size of the piston. Sealing is provided by a seal which has no dead volume which cold flows under a spring bias to maintain the seal under various operating conditions. The sample metering valve for slurry sam...

A sample and stat feeding system for sequentially supplying a renewable supply of cuvettes with aliquots of sample liquids in a continuous processing mode. The sample liquids are contained in a annular sample tray having a plurality of sample vessels molded into the tray. The sample containers form two or more annular rows on the outer edge of the tray in which routine samples are maintained in an ordered sequence. Emergency samples (stats) and controls (standards) are maintained in separate aux...

An improved sample holder for a spectrophotometer includes a stationary base that forms a cylindrical cavity and supports a fiber optic head assembly over the cavity for analyzing the color of a sample that is positioned adjacent the base and under the cavity. The fiber optic head assembly covers the top of the cavity and the area of the sample that is to be color analyzed is not visible to an operator of the spectrophotometer. A shutter mechanism is arranged to be moved in an opening in the bas...

A sample display rack comprising one or more horizontal bars upon which hook-like members are affixed at evenly spaced intervals for purposes of receiving supporting handles and the like on individual samples of planar nature, such as rugs and carpet material, the hook-like members having receiving means for said handles which extend substantially horizontally and at similar acute angles to said bar so as to dispose the hanging samples in shingle fashion in which preferably substantially half of...