公开(公告)号：US20180348094A1

公开(公告)日：2018-12-06

申请号：US15771507

申请日：2016-10-20

Applicant: Gas Measurement Instruments Limited

Inventor： Andrew Corr ,  George McGregor

IPC: G01N1/22 ,  G01N33/00

CPC classification number: G01N33/0014 ,  G01N1/2205

Abstract: A gas inlet nozzle assembly comprises an inlet tube (10) having an inlet end (10a) and an outlet end (10b). A hydrophobic filter (15) is removably engageable in the inlet tube (10) through the inlet end (10a), and a particulate filter (12) is removably engageable in the inlet tube (10) through the inlet end (10a). A retainer (13) is lockingly engageable in the inlet end (10a) of the inlet tube (10) so as to retain the hydrophobic filter (15) and the particulate filter (12) in the inlet tube (10).

公开(公告)号：US20180217056A1

公开(公告)日：2018-08-02

申请号：US15747516

申请日：2016-07-27

Applicant: Gas Measurement Instruments Limited

Inventor： Crawford MASSIE ,  Fraser MATHIESON ,  Andrew GLENDINNING

IPC: G01N21/3518 ,  G01N21/31

CPC classification number: G01N21/3518 ,  G01J1/1626 ,  G01J2001/161 ,  G01N21/314 ,  G01N21/3504 ,  G01N33/0059 ,  G01N2021/3166 ,  G01N2201/1215

Abstract: A detector has a sensor responsive to a first wavelength, a sensor responsive to a second wavelength, and a sensor for collecting reference readings. A gas sample is analysed to obtain readings corresponding to the first wavelength, the second wavelength and a reference. A first absorption figure is calculated using the first reading and the reference reading, and a second absorption figure using the second reading and the reference reading. A lineariser function is applied to the first and second absorption figures to calculate first and second concentration figures. The sensor for each wavelength is calibrated for detecting the first gas such that the data collected at each wavelength gives the same reading when only the first gas is present. The ratio of the first concentration figure to the second concentration figure is used to identify whether only the first gas is present.

公开(公告)号：US10545089B2

公开(公告)日：2020-01-28

申请号：US16274919

申请日：2019-02-13

Applicant: GAS MEASUREMENT INSTRUMENTS LIMITED

Inventor： Crawford Massie ,  Fraser Mathieson ,  Andrew Glendinning

IPC: G01N21/25 ,  G01N21/3518 ,  G01N21/31 ,  G01J1/16 ,  G01N21/3504 ,  G01N33/00

Abstract: A method of identifying the presence of a first gas such as methane within a sample, for example containing natural gas. A detector is provided having a sensor responsive to a first wavelength, a sensor responsive to a second wavelength, and a sensor for collecting reference readings. A gas sample is analysed to obtain a first absorption reading corresponding to the first wavelength, a second absorption reading corresponding to the second wavelength and a reference reading. A first absorption figure is calculated using the first absorption reading and the reference reading, and a second absorption figure using the second absorption reading and the reference reading. The sensor for each wavelength is calibrated for detecting the first gas such that the data collected at each wavelength gives the same reading when only said first gas is present in a sample.

公开(公告)号：US10247666B2

公开(公告)日：2019-04-02

申请号：US15747516

申请日：2016-07-27

Applicant: Gas Measurement Instruments Limited

Inventor： Crawford Massie ,  Fraser Mathieson ,  Andrew Glendinning

IPC: G01N21/00 ,  G01N21/3518 ,  G01N21/3504 ,  G01N21/31 ,  G01J1/16 ,  G01N33/00

Abstract: A detector has a sensor responsive to a first wavelength, a sensor responsive to a second wavelength, and a sensor for collecting reference readings. A gas sample is analyzed to obtain readings corresponding to the first wavelength, the second wavelength and a reference. A first absorption figure is calculated using the first reading and the reference reading, and a second absorption figure using the second reading and the reference reading. A linearizer function is applied to the first and second absorption figures to calculate first and second concentration figures. The sensor for each wavelength is calibrated for detecting the first gas such that the data collected at each wavelength gives the same reading when only the first gas is present. The ratio of the first concentration figure to the second concentration figure is used to identify whether only the first gas is present.

公开(公告)号：US20180306682A1

公开(公告)日：2018-10-25

申请号：US15771456

申请日：2016-10-20

Applicant: Gas Measurement Instruments Limited

Inventor： Andrew Glendinning ,  Ian Binns ,  Fraser Mathieson

IPC: G01N1/24 ,  G01N1/22 ,  G01N33/00 ,  G01N1/14

CPC classification number: G01N1/24 ,  G01N1/14 ,  G01N1/2273 ,  G01N33/0009

Abstract: A diaphragm pump (1) in a gas detection instrument has an inlet (2) which is in fluid communication with a pump chamber (4), and an outlet (3) through which fluid in the pump chamber (4) can be expelled from the pump (1). A wall of the pump chamber (4) is formed by a circuit board 6 on an inner surface of which is mounted a pressure sensor (5) so as to be in fluid communication with the interior of the pump chamber 4 for detecting and monitoring the pressure of the gas passing through the pump chamber (4).