1
Jones Robert H, Johnston Michael B: Nitrogen constituent analysis. Beckman Instruments, Steinmeyer R J, Harder P R, April 15, 1975: US3877875 (41 worldwide citation)

A unitary system is provided with separate channels for detecting and analyzing different types of nitrogen-containing compounds, particularly those which may be encountered in waste treatment or in pollution control or in food product analysis. The channels are so designed that an injected sample i ...


2
Neti Radhakrishna M, Turner George S: Chemiluminescent ammonia detection. Beckman Instruments, Steinmeyer R J, Harder P R, September 9, 1975: US3904371 (37 worldwide citation)

Ammonia content of a gaseous mixture is determined by converting the ammonia to nitric oxide and measuring the nitric oxide. A gaseous mixture sample is passed through a heated mixture of oxides of platinum group metals and/or copper oxide together with vitreous carbon whereby any gaseous ammonia is ...


3
Sternberg James C: Rate sensing batch analyzer. Beckman Instruments, Steinmeyer R J, Harder P R, December 31, 1974: US3857771 (31 worldwide citation)

A portable, automated chemical analyzer having a polarographic oxygen electrode submerged in a batch of stirred solution. The signal from the electrode is directly differentiated and amplified to produce a signal proportional to the time rate of change of oxygen concentration. The membrane of the po ...


4
Houser Edwin A, Schwindt Bernell W: Water quality analysis system with multicircuit single shell heat exchanger. Beckman Instruments, Steinmeyer R J, Harder P R, March 18, 1975: US3871444 (22 worldwide citation)

A modular water quality analysis system for steam electric power generating plants is disclosed which includes a novel single shell multicircuit heat exchanger having means to individually vary the rate of flow of cooling water through each of the multiple circuits therein so that the single heat ex ...


5
Neti Radhakrishna M: Nitrogen dioxide analysis. Beckman Instruments, Steinmeyer R J, Harder P R, March 11, 1975: US3870468 (14 worldwide citation)

A method and apparatus for converting nitrogen dioxide to nitric oxide for the ultimate reaction with ozone to cause a chemiluminescent reaction, the intensity of which is a function of the nitric oxide concentration. The method comprises passing the nitrogen dioxide through a small, confined volume ...


6
Jones Robert H, Hummel Charles V: Liquid sampling device. Beckman Instruments, Steinmeyer R J, Harder P R, August 26, 1975: US3901653 (13 worldwide citation)

A device for dispensing a predetermined quantity of a liquid sample has an S-shaped dosing tube with an inlet connected through a collecting vessel to an air supply for receiving air during vacuum, vent and pressure portions of an operation cycle and an outlet connected to deliver the sample to a re ...


7
Cederstrand Carl N, Keenan Charles A: Dual lighthouse detector. Beckman Instruments, Stienmeyer R J, Harder P R, October 7, 1975: US3911277 (11 worldwide citation)

A sensor unit is provided for selective detection of one or another of gaseous pollutants by response to absorption of infrared radiation by the pollutant to be detected. The unit contains a pair of thermistor elements mounted back to back in a housing having two opposite windows, in each of which f ...


8
Jones Robert H: Liquid transfer system. Beckman Instruments, Steinmeyer R J, Harder P R, September 30, 1975: US3909205 (8 worldwide citation)

A pneumatic transfer system is provided for supplying liquid from a storage vessel to the reservoir of a doser which dispenses fixed quantities of a liquid and maintaining the level of liquid in the reservoir substantially constant. The doser reservoir is at a higher elevation than the storage vesse ...


9
Houser Edwin A, Schwindt Bernell W: Water quality analysis system with multicircuit single shell heat exchanger. Steinmeyer R J, Harder P R, April 29, 1975: US3880226 (8 worldwide citation)

A modular water quality analysis system for steam electric power generating plants is disclosed which includes a novel single shell multicircuit heat exchanger having means to individually vary the rate of flow of cooling water through each of the multiple circuits therein so that the single heat ex ...


10
Cederstrand Carl N, Keegan Jack J: Piggyback optical bench. Beckman Instruments, Steinmeyer R J, Harder P R, November 18, 1975: US3920993 (8 worldwide citation)

An optical bench having a gas flow cell with an infrared source at one end and an infrared sensor at the other end is provided with an attachment or 'piggyback' for determining the concentration of a second constituent or pollutant in a sample. The attachment comprises a sensor inserted into the gas ...