JOHN A ROBERTS
Engineering in South Lynnfield, MA
License number
Massachusetts 6616
Expiration Date
Jun 30, 1990
Type
Mechanical Engineer
Address
Address
South Lynnfield, MA 01940
Professional information
Ceramic Spaced Sensor Assembly For A Gas Leak Detector
US Patent:
3979625, Sep 7, 1976
Filed:
Jun 10, 1975
Appl. No.:
5/585643
Inventors:
John A. Roberts - Lynnfield MA
Assignee:
General Electric Company - Schenectady NY
International Classification:
H01J 2700
US Classification:
313230
Abstract:
A sensor assembly for a halogenated gas leak detector is characterized by having a porous ceramic spacer element positioned around a central electrode and around portions of the turns of a helical heater coil in order to hold these component parts and the respective turns of the coil in fixed, spaced-apart relationship. The central electrode and the turns of the heater coil are formed of fine, closely spaced, flexible wire that must be held in a predetermined position when the sensor is assembled. To construct the sensor pursuant to a preferred method of the invention, a coating of porous ceramic material is deposited and cured on the central electrode and the pores of this coating are loaded with an alkali metal salt. The central electrode is then positioned within the heater coil, from which it is insulated by the coating of ceramic material, and a slurry of ceramic cement is applied to completely surround the coated portion of the central electrode and to at least partially surround each of the turns of the heater coil. The slurry is cured to form a ceramic spacer block that serves to position the central electrode and the respective turns of the heater coil in fixed spaced-apart relationship.
Wet Chlorine Gas Generator For Instrument Applications
US Patent:
4040936, Aug 9, 1977
Filed:
Aug 2, 1976
Appl. No.:
5/711024
Inventors:
Edward D. Orth - Boxford MA
John A. Roberts - Lynnfield MA
Raymond J. D. Smith - Morrison IL
John A. Roberts - Lynnfield MA
Raymond J. D. Smith - Morrison IL
Assignee:
General Electric Company - Schenectady NY
International Classification:
C25B 126, C25B 900
US Classification:
204271
Abstract:
A wet chlorine generator for providing precisely controlled rates of gas flow for instrumentation purposes, characterized by a safe and reliable gas source provided by precisely controllable electrolysis of a metal chloride electrolyte to form chlorine gas that is then passed through a flow regulating device into a gas conduit that guides the gas from the generator to associated instrumentation.
Sensor Assembly For A Halogen Gas Leak Detector
US Patent:
3991360, Nov 9, 1976
Filed:
May 16, 1975
Appl. No.:
5/577986
Inventors:
Edward D. Orth - Boxford MA
John A. Roberts - Lynnfield MA
John A. Roberts - Lynnfield MA
Assignee:
General Electric Company - Schenectady NY
International Classification:
G01N 2762, H01J 724
US Classification:
324 33
Abstract:
A sensor assembly for a halogen gas leak detector characterized by including a tubular, porous, high purity Alumina (Al. sub. 2 O. sub. 3) element for supporting electrode and heater components in spaced-apart relationship relative to one another and a surrounding housing. The porous Alumina element is doped with an alkali metal by methods that cause the alkali metal to be distributed throughout the porous Alumina structure. The assembly is further characterized by incorporating a ribbon-like heater coil helically wound around the tubular Alumina element. In one embodiment of the invention the Alumina element is provided with a stepped end structure that effectively insulates the ends of an electrode mounted within the tubular element from the surrounding housing.
Pneumatic System For A Gas Sensor
US Patent:
4056967, Nov 8, 1977
Filed:
Jul 16, 1976
Appl. No.:
5/705988
Inventors:
John A. Roberts - Lynnfield MA
Assignee:
General Electric Company - Schenectady NY
International Classification:
G01N 3100
US Classification:
73 1G
Abstract:
A pneumatic system for controlling admission of gas samples to a toxic gas monitoring sensor, characterized by including an internally isolated, series pneumatic circuit for continuously circulating purging gas through the sensor, in combination with a gas sampling circuit for introducing gas samples from one or more sources into the relatively isolated series circuit. The gas sampling circuit is further characterized by including a calibration loop having a standard gas leak that is periodically energized to assure the accuracy of readings indicated by the gas sensor in the internal isolated series loop. Also, the gas sampling circuit includes a zero gas source that is selectively operable to feed purifying gas into the gas sampling circuit and thence to the series circuit including the sensor in order to enable flow meters in the system to be calibrated periodically.
Toxic Gas Monitor Having Automatic Calibration
US Patent:
4151738, May 1, 1979
Filed:
Nov 3, 1977
Appl. No.:
5/848200
Inventors:
Donald R. Hyer - Lynnfield MA
John A. Roberts - Lynnfield MA
John A. Roberts - Lynnfield MA
Assignee:
General Electric Company - New York NY
International Classification:
G01N 3100
US Classification:
73 1G
Abstract:
A gas monitor for monitoring the concentration of particular atmospheric constituent includes a sensor and a signal processor that provides concentration-indicating output signals in response to successive samples admitted to the sensor. The processor multiplies the sensor signals by a calibration signal. It automatically recalibrates the monitor by periodically causing a sample having a standard concentration to be admitted to the sensor and adjusting the calibration signal to provide a corresponding predetermined output signal level.