HK1244739A1 - 用於通過電容法確定填充水平的傳感器和傳感器組件 - Google Patents

用於通過電容法確定填充水平的傳感器和傳感器組件

Info

Publication number
HK1244739A1
HK1244739A1 HK18104311.4A HK18104311A HK1244739A1 HK 1244739 A1 HK1244739 A1 HK 1244739A1 HK 18104311 A HK18104311 A HK 18104311A HK 1244739 A1 HK1244739 A1 HK 1244739A1
Authority
HK
Hong Kong
Prior art keywords
sensor
filling level
capacitive determination
sensor assembly
assembly
Prior art date
Application number
HK18104311.4A
Other languages
English (en)
Inventor
Thomas Klemm
Michael Schabbach
Michael Meindl
Robert Lurf
Andreas Oberleitner
Martin Beisteiner
Original Assignee
Sanofi Aventis Deutschland
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sanofi Aventis Deutschland filed Critical Sanofi Aventis Deutschland
Publication of HK1244739A1 publication Critical patent/HK1244739A1/zh

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/24Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61JCONTAINERS SPECIALLY ADAPTED FOR MEDICAL OR PHARMACEUTICAL PURPOSES; DEVICES OR METHODS SPECIALLY ADAPTED FOR BRINGING PHARMACEUTICAL PRODUCTS INTO PARTICULAR PHYSICAL OR ADMINISTERING FORMS; DEVICES FOR ADMINISTERING FOOD OR MEDICINES ORALLY; BABY COMFORTERS; DEVICES FOR RECEIVING SPITTLE
    • A61J1/00Containers specially adapted for medical or pharmaceutical purposes
    • A61J1/14Details; Accessories therefor
    • A61J1/20Arrangements for transferring or mixing fluids, e.g. from vial to syringe
    • A61J1/22Arrangements for transferring or mixing fluids, e.g. from vial to syringe with means for metering the amount of fluid
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/20Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/24Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
    • G01D5/2405Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by varying dielectric
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/26Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G01F23/263Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
    • G01F23/265Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors for discrete levels
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/26Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G01F23/263Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
    • G01F23/266Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors measuring circuits therefor
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/26Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G01F23/263Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
    • G01F23/268Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors mounting arrangements of probes
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00General characteristics of the apparatus
    • A61M2205/33Controlling, regulating or measuring
    • A61M2205/3317Electromagnetic, inductive or dielectric measuring means
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00General characteristics of the apparatus
    • A61M2205/33Controlling, regulating or measuring
    • A61M2205/3379Masses, volumes, levels of fluids in reservoirs, flow rates
    • A61M2205/3389Continuous level detection
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142Pressure infusion, e.g. using pumps
    • A61M5/145Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons
    • A61M5/1452Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/168Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
    • A61M5/16831Monitoring, detecting, signalling or eliminating infusion flow anomalies
    • A61M5/1684Monitoring, detecting, signalling or eliminating infusion flow anomalies by detecting the amount of infusate remaining, e.g. signalling end of infusion
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F25/00Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
    • G01F25/20Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level

Landscapes

  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • General Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Anesthesiology (AREA)
  • Vascular Medicine (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Electromagnetism (AREA)
  • Pharmacology & Pharmacy (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
HK18104311.4A 2015-04-16 2018-03-29 用於通過電容法確定填充水平的傳感器和傳感器組件 HK1244739A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP15163896 2015-04-16
PCT/EP2016/058440 WO2016166338A1 (en) 2015-04-16 2016-04-15 Sensor and sensor assembly for capacitive determination of a filling level

Publications (1)

Publication Number Publication Date
HK1244739A1 true HK1244739A1 (zh) 2018-08-17

Family

ID=52875056

Family Applications (1)

Application Number Title Priority Date Filing Date
HK18104311.4A HK1244739A1 (zh) 2015-04-16 2018-03-29 用於通過電容法確定填充水平的傳感器和傳感器組件

Country Status (6)

Country Link
US (1) US10953157B2 (zh)
EP (2) EP3283145B1 (zh)
JP (1) JP6918702B2 (zh)
CN (1) CN107787233B (zh)
HK (1) HK1244739A1 (zh)
WO (1) WO2016166338A1 (zh)

Families Citing this family (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3268078B1 (en) 2015-03-10 2020-11-04 Regeneron Pharmaceuticals, Inc. Aseptic piercing system
CN108206048A (zh) * 2016-12-19 2018-06-26 广东东阳光药业有限公司 注射器用数据采集方法及自动采集刻度数据的注射器
US11058321B2 (en) 2016-12-20 2021-07-13 Boston Scientific Scimed Inc. Current driven sensor for magnetic navigation
CN110430909B (zh) 2017-01-26 2022-03-01 赛诺菲-安万特德国有限公司 用于注射装置的柔性模块
WO2018152241A1 (en) * 2017-02-15 2018-08-23 Abbott Diabetes Care Inc. Systems, devices, and methods for integration of an analyte data reader and medication delivery device
US10219981B2 (en) * 2017-03-31 2019-03-05 Integra Lifesciences Switzerland Sàrl Fluid containers and systems and methods for detecting a fluid level therein
SG11201908539VA (en) 2017-05-05 2019-11-28 Regeneron Pharma Auto-injector
US10216304B2 (en) * 2017-05-08 2019-02-26 Dell Products Lp Touch screen display device with improved ESD protection
WO2018206439A1 (en) * 2017-05-09 2018-11-15 Novo Nordisk A/S Flexible electronic label device
WO2018218167A1 (en) * 2017-05-25 2018-11-29 West Pharmaceutical Services, Inc. Smart syringe using nfc communication and capacitance detection
DE102017218551A1 (de) * 2017-10-18 2019-04-18 Robert Bosch Gmbh Haftetikett für einen Behälter
EP3710082A1 (en) * 2017-11-14 2020-09-23 Sanofi Wireless electronics assembly for injection devices
CN112041681A (zh) 2017-12-18 2020-12-04 赛诺菲 包含可充电电池的独立使用nfc血糖仪
SG10201801940VA (en) * 2018-03-08 2019-10-30 Bosch Gmbh Robert A drug delivery system
WO2019219797A1 (en) * 2018-05-17 2019-11-21 Sanofi Touch sensitive label for an injection device
DE102018111960A1 (de) * 2018-05-17 2019-11-21 Vega Grieshaber Kg Impedanzgrenzstandsensor
EP3598082A1 (de) * 2018-07-20 2020-01-22 VEGA Grieshaber KG Messgerät mit nahfeldinteraktionseinrichtung
CA3114912A1 (en) * 2018-10-01 2020-04-09 Elemental Machines, Inc. Method and apparatus for local sensing
WO2020112227A1 (en) * 2018-11-30 2020-06-04 Carrier Corporation Printed capacitive liquid level sensor for fire suppression
GB201819828D0 (en) * 2018-12-05 2019-01-23 Adelie Health Ltd Device for measuring fluid and method of use
FR3096774B1 (fr) * 2019-05-27 2021-05-28 Kapflex Capteur de mesures capacitives intégré en paroi
US20230103467A1 (en) * 2019-12-17 2023-04-06 Merck Sharp & Dohme Llc Non-invasive continuous capacitance level detector
EP3971776A1 (en) 2020-09-18 2022-03-23 Becton Dickinson France Medical container comprising an rfid tag for remote identification
WO2022093972A1 (en) * 2020-10-30 2022-05-05 Analog Devices, Inc. Sensor module
CN112304390A (zh) * 2020-11-18 2021-02-02 上海理工大学 一种基于柔性基板的液位传感器的感应电容
CN112268597A (zh) * 2020-11-18 2021-01-26 上海理工大学 一种基于导电涂料的感应电容
EP4094791A1 (en) * 2021-05-26 2022-11-30 Becton Dickinson France Medical device with rfid tag directly printed on one part of this medical device
EP4406062A1 (en) * 2021-09-24 2024-07-31 Sanofi Arrangement for a drug delivery device, drug delivery device and user interface module
USD1007676S1 (en) 2021-11-16 2023-12-12 Regeneron Pharmaceuticals, Inc. Wearable autoinjector
AU2022401512A1 (en) * 2021-11-30 2024-05-30 Insulet Corporation Capacitance sensing for component positioning detection
DE102022204944A1 (de) * 2022-05-18 2023-11-23 Volkswagen Aktiengesellschaft Sensoranordnung mit integrierter Elektronik

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6110148A (en) 1994-07-22 2000-08-29 Health Hero Network, Inc. Capacitance-based dose measurements in syringes
ES2498966T3 (es) 2001-05-21 2014-09-26 Scott Laboratories, Inc. Etiqueta de RF-ID para un envase médico
US7086593B2 (en) 2003-04-30 2006-08-08 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Magnetic field response measurement acquisition system
JP2009530001A (ja) 2006-03-20 2009-08-27 ノボ・ノルデイスク・エー/エス カートリッジの識別コードの非接触読取り
US20090318876A1 (en) * 2006-07-07 2009-12-24 Novo Nordisk A/S Determination of a Type and an Amount of a Medicament by Inductive Means
US8482298B2 (en) * 2006-12-18 2013-07-09 Schrader Electronics Ltd. Liquid level and composition sensing systems and methods using EMF wave propagation
JP4698702B2 (ja) 2008-05-22 2011-06-08 三菱電機株式会社 電子機器
JP2010066088A (ja) * 2008-09-10 2010-03-25 Toray Ind Inc センサー用フィルム電極及びその製造方法
JP5881208B2 (ja) * 2012-03-14 2016-03-09 矢崎総業株式会社 静電容量式液面レベルセンサ及び静電容量式液面レベルセンサの製造方法
AT512504B1 (de) 2012-03-22 2013-09-15 Seibersdorf Labor Gmbh Vorrichtung und Verfahren zur Bestimmung der Kapazität
AT513452B1 (de) 2012-10-05 2014-08-15 Ait Austrian Inst Technology Abgabevorrichtung für Medikamente
US9488513B2 (en) 2012-12-05 2016-11-08 Molex, Llc Flexible fluid level sensor with improved measurement capability
JP5597789B2 (ja) * 2013-06-06 2014-10-01 亀岡電子株式会社 静電容量式液面レベルセンサ
JP6209367B2 (ja) * 2013-06-07 2017-10-04 矢崎総業株式会社 液面レベルセンサ

Also Published As

Publication number Publication date
EP3283145C0 (en) 2024-08-28
CN107787233B (zh) 2021-06-01
US10953157B2 (en) 2021-03-23
US20180093042A1 (en) 2018-04-05
JP2018511425A (ja) 2018-04-26
EP3283145B1 (en) 2024-08-28
WO2016166338A1 (en) 2016-10-20
CN107787233A (zh) 2018-03-09
EP4442296A2 (en) 2024-10-09
EP3283145A1 (en) 2018-02-21
JP6918702B2 (ja) 2021-08-11

Similar Documents

Publication Publication Date Title
HK1244739A1 (zh) 用於通過電容法確定填充水平的傳感器和傳感器組件
GB2559573B (en) Touch Sensor
GB2559569B (en) Touch sensor
PT3505877T (pt) Deteção do nível de tinta
GB201405713D0 (en) Fluid sensor
HK1253212A1 (zh) 壓力感測器
GB2529898B (en) Touch sensors
GB2559575B (en) Touch sensor
EP3631609C0 (en) CAPACITIVE SENSOR DEVICE
GB2556783B (en) Touch sensor
GB2559574B (en) Touch sensor
GB201718625D0 (en) Liquid level sensor
GB202107460D0 (en) Capacitive sensor
GB201418200D0 (en) Determining an absorption coefficient of a liquid
EP3388928A4 (en) CAPACITIVE SENSOR
EP3082026C0 (en) CAPACITIVE TOUCH SENSOR SYSTEM
EP3246797A4 (en) Capacitive sensor
PT3143480T (pt) Caneta eletrónica implementando compensação de flutuações do sensor
EP3246798A4 (en) Capacitive sensor
SG11201607892WA (en) Capacitive touch sensor
GB201617060D0 (en) Capacitive sensing
GB2553156B (en) Pressure sensor
EP3195476A4 (en) Capacitive touch sensor
GB2570295B (en) Capacitive sensing
GB2568196B (en) Capacitive gas sensor