公开(公告)号：AU2002365479A8

公开(公告)日：2003-06-10

申请号：AU2002365479

申请日：2002-11-20

Applicant: ION SCIENCE LTD

Inventor： STOCKDALE MARK JULIAN ,  DEAN WILLIAM FRANCIS HOULTON

IPC: G01N27/62 ,  G01N33/00

Abstract: An ionization detector includes a third (fence) electrode ( 55 ) between the counter electrode ( 53 ) and the sensing electrode ( 54 ). The fence electrode ( 53 ) is maintained at or near the potential of the sensing electrode ( 54 ) and traps charge movement (electrolytic current) along the detector walls associated with condensation and/or contamination within the detector. In a photoionisation detector, the fence electrode is also adapted to trap photo-induced current originating from the cathode ( 53 ). Current drawn from the fence electrode ( 53 ) provides a measure of the degree of contamination or condensation within the detector and of lamp efficiency.

公开(公告)号：AU2002365479A1

公开(公告)日：2003-06-10

申请号：AU2002365479

申请日：2002-11-20

Applicant: ION SCIENCE LTD

Inventor： DEAN WILLIAM FRANCIS HOULTON ,  STOCKDALE MARK JULIAN

IPC: G01N27/62 ,  G01N27/00

Abstract: An ionization detector includes a third (fence) electrode ( 55 ) between the counter electrode ( 53 ) and the sensing electrode ( 54 ). The fence electrode ( 53 ) is maintained at or near the potential of the sensing electrode ( 54 ) and traps charge movement (electrolytic current) along the detector walls associated with condensation and/or contamination within the detector. In a photoionisation detector, the fence electrode is also adapted to trap photo-induced current originating from the cathode ( 53 ). Current drawn from the fence electrode ( 53 ) provides a measure of the degree of contamination or condensation within the detector and of lamp efficiency.

公开(公告)号：CA2467859A1

公开(公告)日：2003-06-05

申请号：CA2467859

申请日：2002-11-20

Applicant: ION SCIENCE LTD

Inventor： DEAN WILLIAM FRANCIS HOULTON ,  STOCKDALE MARK JULIAN

IPC: G01N27/62 ,  G01N33/00

Abstract: An ionisation detector includes a third (fence) electrode (55) between the counter electrode (53) and the sensing electrode (54). The fence electrode (53) is maintained at or near the potential of the sensing electrode (54) an d traps charge movement (electrolytic current) along the detector walls associated with condensation and/or contamination within the detector. In a photoionisation detector, the fence electrode is also adapted to trap photo- induced current originating from the cathode (53). Current drawn from the fence electrode (53) provides a measure of the degree of contamination or condensation within the detector and of lamp efficiency.

公开(公告)号：GB2537361A8

公开(公告)日：2016-10-26

申请号：GB201506150

申请日：2015-04-10

Applicant: ION SCIENCE LTD

Inventor： STOCKDALE MARK JULIAN ,  DEAN WILLIAM FRANCIS HOULTON ,  WITTY ANDREW

IPC: G01N27/66 ,  G01N33/00 ,  G01N33/18

Abstract: Apparatus for detecting the presence of gaseous analytes in water comprises a submersible housing 10 enclosing a waterproof sensing chamber 20 having a wall 22 made of material transparent to UV light from source 12 and a wall 18 of a gas permeable membrane for admitting into the chamber gas dissolved in water in which the housing is immersed, first and a second spaced sensing electrodes 24, 26 within the chamber, and a circuit connected to the electrodes for measuring current flowing through the sensing electrodes from ionisation of a gas in the chamber by UV light, characterised in that a third electrode 28 is in the sensing chamber and the circuit applies a sufficient voltage across the third electrode and the first sensing electrode 24 to reduce condensation within the sensing chamber by hydrolysing condensation in electrical contact with the first and third electrodes.

公开(公告)号：GB2449664B

公开(公告)日：2011-12-14

申请号：GB0710287

申请日：2007-05-30

Applicant: ION SCIENCE LTD

Inventor： STOCKDALE MARK JULIAN ,  EAGLING KARA MICHELE

IPC: H01R13/436 ,  G01N27/66 ,  H01J1/88 ,  H01J1/92 ,  H01J1/94 ,  H01R13/40 ,  H01R13/514

Abstract: A demountable pellet is disclosed for use as an electrode contact assembly. The pellet comprises a base 1 upon which is mounted a plurality of electrodes 18,19,20 arranged in respective spaced parallel planes and having respective contacts 23,24,25 protruding from them. A closure 2 for the base 1 has a member 11,12,13 engaging at least one of the electrode contacts. In an unassembled condition of the pellet, with the closure 2 separate from the base 1 and each closure member disengaged from its respective electrode contact, the contacts 23,24,25 lie in respective spaced parallel planes. In the assembled condition of the pellet with each closure member engaging its respective electrode contact, at least one of the contacts 23,24,25 lies in a plane other than that in which it lay in the unassembled condition of the pellet.

公开(公告)号：DE60222304T2

公开(公告)日：2008-06-05

申请号：DE60222304

申请日：2002-11-20

Applicant: ION SCIENCE LTD

Inventor： DEAN WILLIAM FRANCIS ,  STOCKDALE MARK JULIAN

IPC: G01N33/00 ,  G01N27/62

Abstract: An ionization detector includes a third (fence) electrode ( 55 ) between the counter electrode ( 53 ) and the sensing electrode ( 54 ). The fence electrode ( 53 ) is maintained at or near the potential of the sensing electrode ( 54 ) and traps charge movement (electrolytic current) along the detector walls associated with condensation and/or contamination within the detector. In a photoionisation detector, the fence electrode is also adapted to trap photo-induced current originating from the cathode ( 53 ). Current drawn from the fence electrode ( 53 ) provides a measure of the degree of contamination or condensation within the detector and of lamp efficiency.

公开(公告)号：GB2345969A

公开(公告)日：2000-07-26

申请号：GB9828293

申请日：1998-12-22

Applicant: ION SCIENCE LTD

Inventor： STOCKDALE MARK JULIAN ,  LING ALAN EDWARD ,  DEAN FRANK WILLIAM HOULTON

IPC: G01M3/20 ,  G01M3/22 ,  G01N1/22 ,  G01M3/16

Abstract: A system for detecting a leak in a container 18 comprises means for extracting a sample of gas from an enclosure 11 surrounding the container and delivering it to a photo-ionisation detector (PID) 16. The delivery means may include apparatus for extracting and diluting a sub-sample of the gas sample with a carrier gas CG, such as a gas-driven Venturi extraction system 15. The system may include an automatic purging arrangement, which is triggered when the detector indicates an excessive amount of contaminating material.