-
公开(公告)号：GB2019642B
公开(公告)日：1982-12-15
申请号：GB7845803
申请日：1978-11-23
Applicant: ISOTEC IND LTD
IPC: G08B17/113 , H01J41/08 , H01J39/28
-
公开(公告)号：GB1599834A
公开(公告)日：1981-10-07
申请号：GB560078
申请日：1978-02-13
Applicant: WESTINGHOUSE ELECTRIC CORP
Abstract: Apparatus for sensing overheated electrical insulation through the detection of thermoparticulates in a dynamoelectric machine's cooling gas system is disclosed. The cooling gas as it circulates will entrain thermoparticulates produced in the system when there is overheating. This gaseous carrier is then withdrawn and conducted to an ionization chamber where it is ionized. Downstream from the ionization chamber there is placed a first ion collector for collecting ions with relatively small radii. A second ion collector which is biased for collecting ions with relatively large radii is also placed downstream from the ionization chamber. By comparison of ion current from the first ion collector with ion current from the second ion collector it is possible to detect the presence of thermoparticulates in the cooling gas relatively independent of gas pressure, flow rate through the monitor, and effectiveness of the radiation source.
-
公开(公告)号：CA1109570A
公开(公告)日：1981-09-22
申请号：CA301975
申请日：1978-04-19
Applicant: ISOTEC IND LTD
Inventor： MALLORY JOHN , TURLEJ ZBIGNIEW
IPC: G08B17/113 , H01J41/08 , G01T1/18
Abstract: In an electronic smoke sensing and alarm device, a dual ionization chamber arrangement comprises a single source of radioactive material and first and second chambers separated by a common electrically conductive electrode. A portion of the radioactive material ionizes the air in the first chamber and another portion of the radioactive material ionizes the air in the second chamber. This arrangement provides an accurate control on the current flow through each chamber.
-
公开(公告)号：DE1900888C3
公开(公告)日：1981-07-16
申请号：DE1900888
申请日：1969-01-09
Applicant: VIGIFEU, AUBERVILLIERS, FR
Inventor： VERZICHT DES ERFINDERS AUF NENNUNG
IPC: G08B17/12 , G08B17/113 , H01J41/08 , H01J47/02 , G08B17/10
-
公开(公告)号：SE417025B
公开(公告)日：1981-02-16
申请号：SE7601595
申请日：1976-02-12
Applicant: GAMEWELL CORP
Inventor： SOLOMO E E
Abstract: An ionization detecting fire alarm device that comprises a double chamber structure, a source disposed in at least one of the chambers and a vernier adjusting screw electrode protruding into one chamber. The chamber containing the adjustable electrode is more open to the atmosphere than the other chamber. Porting is provided between chambers and detection occurs by sensing the rate of change of ionization current in the chamber structure. The source or sources, one being in each chamber, is a beta source such as a nickel 63 source. A change in ionization current is detected by a unique circuit of this invention which comprises a programmable unijunction transistor oscillator circuit.
-
Patent Agency Ranking
公开(公告)号：CA1083219A
公开(公告)日：1980-08-05
申请号：CA295960
申请日：1978-01-31
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： FORT EMIL M
Abstract: RELIABLE DYNAMOELECTRIC MACHINE CONDITION MONITOR Apparatus for sensing overheated electrical insulation through the detection of thermoparticulates in a dynamoelectric machine's cooling gas system is disclosed. The cooling gas as it circulates will entrain thermoparticulates produced in the system when there is overheating. This gaseous carrier is then withdrawn and conducted to an ionization chamber where it is ionized. Downstream from the ionization chamber there is placed a first ion collector for collecting ions with relatively small radii. A second ion collector which is biased for collecting ions with relatively large radii is also placed downstream from the ionization chamber. By comparison of ion current from the first ion collector with ion current from the second ion collector it is possible to detect the presence of thermoparticulates in the cooling gas relatively independent of gas pressure, flow rate through the monitor, and effectiveness of the radiation source.
-
-
公开(公告)号：AU506039B2
公开(公告)日：1979-12-13
申请号：AU1088876
申请日：1976-02-06
Applicant: COMMW IND GASES
Inventor： POWER B D , PRIESTLAND C R D
-
公开(公告)号：DK139326C
公开(公告)日：1979-07-02
申请号：DK51076
申请日：1976-02-09
Applicant: GAMEWELL CORPORATION
Inventor： SOLOMON E E
Abstract: An ionization detecting fire alarm device that comprises a double chamber structure, a source disposed in at least one of the chambers and a vernier adjusting screw electrode protruding into one chamber. The chamber containing the adjustable electrode is more open to the atmosphere than the other chamber. Porting is provided between chambers and detection occurs by sensing the rate of change of ionization current in the chamber structure. The source or sources, one being in each chamber, is a beta source such as a nickel 63 source. A change in ionization current is detected by a unique circuit of this invention which comprises a programmable unijunction transistor oscillator circuit.
-
公开(公告)号：GB1542146A
公开(公告)日：1979-03-14
申请号：GB1610176
申请日：1976-04-21
Applicant: GAMEWELL CORP
Abstract: An ionization detecting fire alarm device that comprises a double chamber structure, a source disposed in at least one of the chambers and a vernier adjusting screw electrode protruding into one chamber. The chamber containing the adjustable electrode is more open to the atmosphere than the other chamber. Porting is provided between chambers and detection occurs by sensing the rate of change of ionization current in the chamber structure. The source or sources, one being in each chamber, is a beta source such as a nickel 63 source. A change in ionization current is detected by a unique circuit of this invention which comprises a programmable unijunction transistor oscillator circuit.
-
-
-
-
-
-
-
-
-
Search Results
216
records
(took 0.019 seconds)
