Abstract: A strip of material is reacted in situ with a chemical agent so as to create a chemical change affecting the magnetic properties of the material. From past history with the same kind of strip under identical conditions of reactions with the chemical agent, data such as time of exposure, temperature and partial pressure are recorded providing a calibration of any sensed magnetic property changes in such strip. An accurate direct measurement is thus made possible with an identical strip exposed to unknown temperature or partial pressure, by sensing of the degree of magnetization of the strip.

Abstract: A composition is disclosed of a metal dithiocarbamate, a resinous carrier, and a solvent. The composition is applied to a portion of an electrical apparatus which is exposed to a gas stream. The solvent in the composition is evaporated to produce a thermoparticulating coating. When the electrical apparatus overheats the metal dithiocarbamate in the coating forms particles in the gas stream which are detected by the monitor.

Abstract: A composition is disclosed of a blocked isocyanate, a resinous carrier, and a solvent. The composition is applied to a portion of an electrical apparatus which is exposed to a gas stream. The solvent in the composition is evaporated to produce a thermoparticulating coating. When the electrical apparatus overheats the blocked isocyanate in the coating forms particles in the gas stream which are detected by a monitor.

Abstract: A conducting non-aqueous colloidal polyamic acid electrodeposition composition is made by reacting (1) 1 part polyamic acid and 29-37 parts non-aqueous, organic solvent for the acid with (2) 0.8-1.2 parts of a nitrogen containing base to form an organic salt which is added to 50-150 parts of a non-aqueous, organic non-electrolizable, non-solvent for the acid salt.

Abstract: A composition is disclosed of a malonic acid derivative, a resinous carrier, and a solvent. The composition is applied to a portion of an electrical apparatus which is exposed to a gas stream. The solvent in the composition is evaporated to produce a thermoparticulating coating. When the electrical apparatus overheats the malonic acid derivative in the coating forms particles in the gas stream which are detected by a monitor.

Abstract: The occurrence of excessively high temperatures in areas of a generator exposed to a cooling gas stream is visually indicated by passing a portion of the gas stream through an indicator device which comprises a filter holder containing a gas-permeable, particulate-collecting filter on which is an indicator which produces a visual effect when contacted by particulates. A valve controls the flow of the gas to the device and is opened by a monitor when the monitor detects particulates in the gas stream.

Abstract: A composition is disclosed of a sulfonic acid or amine salt thereof, a resinous carrier, and a solvent. The composition is applied to a portion of an electrical apparatus which is exposed to a gas stream. The solvent in the composition is evaporated to produce a thermoparticulating coating. When the electrical apparatus overheats the sulfonic acid or amine sulfonate in the coating forms particles in the gas stream which are detected by a monitor.

Abstract: A method of coating a copper substrate comprises the steps of: anodically microsmoothing the copper substrate in an acid bath to provide a substantially smooth surface; electrocoating the microsmoothed substrate with a pin hole free nickel film having a thickness of between about 2.5 microns to about 12.5 microns; single step, non-aqueous electrocoating the microsmoothed, nickel coated substrate with a pin hole free polyamic acid polymer, and curing the polyamic acid coating to form a polyimide film free of copper ion contamination.

Abstract: A composition is disclosed of a diazonium salt, a resinous carrier, and a solvent. The composition is applied to a portion of an electrical apparatus which is exposed to a gas stream. The solvent in the composition is evaporated to produce a thermoparticulating coating. When the electrical apparatus overheats the diazonium salt in the coating forms particles in the gas stream which are detected by a monitor.

Abstract: A conducting, non-aqueous, colloidal, polysulfone electrodeposition composition is made by mixing: (1) 1 part polysulfone polymer and 20-37 parts non-aqueous, organic, aprotic solvent for the polysulfone polymer with (2) 0.8-1.2 parts of a nitrogen containing base, to form a polysulfone polymer solution, which is added to (3) 25-150 parts of a non-aqueous, non-solvent for the polysulfone polymer, which is miscible with the aprotic solvent.

Abstract: A composition is disclosed of a malonic acid derivative, a resinous carrier, and a solvent. The composition is applied to a portion of an electrical apparatus which is exposed to a gas stream. The solvent in the composition is evaporated to produce a thermoparticulating coating. When the electrical apparatus overheats the malonic acid derivative in the coating forms particles in the gas stream which are detected by a monitor.

Abstract: A composition is disclosed of a diazonium salt, a resinous carrier, and a solvent. The composition is applied to a portion of an electrical apparatus which is exposed to a gas stream. The solvent in the composition is evaporated to produce a thermoparticulating coating. When the electrical apparatus overheats the diazonium salt in the coating forms particles in the gas stream which are detected by a monitor.

Abstract: A composition is disclosed of a metal acetylacetonate, a resinous carrier, and a solvent. The composition is applied to a portion of an electrical apparatus which is exposed to a gas stream. The solvent in the composition is evaporated to produce a thermoparticulating coating. When the electrical apparatus overheats the metal acetylacetonate in the coating forms particles in the gas stream which are detected by a monitor.

Abstract: A composition is disclosed of malonic acid, a resinous carrier, and a solvent. The composition is applied to a portion of an electrical apparatus which is exposed to a fluid stream. The solvent in the composition is evaporated to produce a thermo-particulating coating. When the electrical apparatus overheats the malonic acid in the coating forms particles in the fluid stream which are detected by a monitor.

Abstract: A sampling system monitors a gas stream of a power generator and automatically samples the gas stream if its characteristics indicate that a material in the power generator is being thermally degraded. A gas stream monitoring device generates a first signal if it detects degradation occurring. A time-delay relay determines whether the first signal is continuous, and if it is the relay acts to prevent the monitor from monitoring the gas stream. If the first signal then terminates, a second signal is generated which activates an alarm and permits gas to flow into a sampling device. The sampling device has three sections which collect large particles, small particulates, and vapors and gases. The products collected can be analyzed to determine which material in the power generator was thermally degraded.

Abstract: A thermoparticulating tape is disclosed which comprises a flexible fibrous material, a compound which thermoparticulates at a temperature below 200.degree.C dispersed throughout the flexible fibrous material, and a flexible outer coating over the flexible fibrous material through which the products formed when the compound thermoparticulates can pass. The tape is best made by dissolving the thermoparticulating compound in a solvent, immersing the fibrous material in the solution, evaporating the solvent, and applying the outer coating to the fibrous material. An adhesive backing can be applied to the tape if desired. The tape is placed in an electrical apparatus cooled by a gas stream, in a position exposed to the gas stream. When overheating occurs the tape darkens and emits particles into the gas stream which are detected by a monitor.

Abstract: A grease of a telomer of polytetrafluoroethylene and a perfluoroalkyl polyether is used to protect electrical apparatus from overheating. The grease is applied to a portion of an electrical apparatus which is exposed to a gas stream, particularly to portions subjected to operating temperatures of about 100.degree. to about 130.degree.C. When the coated portion of the electrical apparatus overheats the grease forms particles in the gas stream which are detected by a monitor. The apparatus can then be shut down or its load reduced.

Abstract: A conducting electrodeposition composition contains a resinous polymer dissolved in concentrations to the saturation point in a balanced solvent system of two miscible liquids, one of the liquids being a solvent for the polymer and the other being a non-solvent for the polymer.

Abstract: Monomers having both an amine group and an anhydride or two carboxylic acid or salt groups are electropolymerized in solution. In an alcohol solvent the polymer forms as a coating on the anode, and in an aprotic solvent the polymer remains in solution. The polymer is cured to form a polyimide.