GB1345101A - Instrument for measurement of dewpoints or partial water vapour pressures - Google Patents

Instrument for measurement of dewpoints or partial water vapour pressures

Info

Publication number
GB1345101A
GB1345101A GB1345101DA GB1345101A GB 1345101 A GB1345101 A GB 1345101A GB 1345101D A GB1345101D A GB 1345101DA GB 1345101 A GB1345101 A GB 1345101A
Authority
GB
United Kingdom
Prior art keywords
water vapour
membrane
dewpoint
mirror
air
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Crutchley N A
OMNIA ENG Ltd
Original Assignee
Crutchley N A
OMNIA ENG Ltd
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 Crutchley N A, OMNIA ENG Ltd filed Critical Crutchley N A
Publication of GB1345101A publication Critical patent/GB1345101A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/56—Investigating or analyzing materials by the use of thermal means by investigating moisture content
    • G01N25/66—Investigating or analyzing materials by the use of thermal means by investigating moisture content by investigating dew-point
    • G01N25/68—Investigating or analyzing materials by the use of thermal means by investigating moisture content by investigating dew-point by varying the temperature of a condensing surface

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)

Abstract

1345101 Partial pressure measurement - determining dewpoint OMNIA (ENG) Ltd and N A CRUTCHLEY 21 Jan 1972 2888/72 Headings G1A G1S The partial water vapour pressure of a substance in a container 3 Fig.1, is determined by measuring the temperature of a thermo-electric Peltier-effect cooled dewpoint-sensing mirror 6 exposed to a jet of air in an enclosed air flow system which comprises a narrow bore tubular water vapour permeable membrane 2 immersed in container 3. The air is circulated by a pump 4, and the circuit includes a dryer 20 which may be by-passed by a valve 7. The deposit of water vapour on the mirror 6 is detected photoelectrically by lamp 12 and photo-cell 13 through light guides 10, 11. The system includes a second cell 17 providing a radiation reference, and the temperature of the mirror is maintained at the dewpoint by the photo-cell output. A thermister 21 indicates the temperature and thus the partial pressure. A second embodiment, Fig.2 (not shown), includes a pair of Peltier cooled mirrors together with their sensing systems and the partial pressures are measured before and after passing through the membrane. Chamber 3 may be a flow pipe in a process and the output may indicate the moisture content. The membrane may be in the form of a coiled micro-bore tube or panels of membrane material having an air space between them and bounded at their sides by metal.
GB1345101D 1972-01-21 1972-01-21 Instrument for measurement of dewpoints or partial water vapour pressures Expired GB1345101A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB288872 1972-01-21

Publications (1)

Publication Number Publication Date
GB1345101A true GB1345101A (en) 1974-01-30

Family

ID=9747903

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1345101D Expired GB1345101A (en) 1972-01-21 1972-01-21 Instrument for measurement of dewpoints or partial water vapour pressures

Country Status (1)

Country Link
GB (1) GB1345101A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2188163A (en) * 1986-03-18 1987-09-23 British Petroleum Co Plc Testing degradation of a sample under thermal cycling
DE3619301A1 (en) * 1986-06-07 1987-12-10 Ruhrgas Ag METHOD AND DEVICE FOR MEASURING ALDEHYDE CONCENTRATION IN EXHAUST GASES
GB2206697A (en) * 1987-06-11 1989-01-11 Junichi Nishizawa Measuring very low water content in gas

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2188163A (en) * 1986-03-18 1987-09-23 British Petroleum Co Plc Testing degradation of a sample under thermal cycling
DE3619301A1 (en) * 1986-06-07 1987-12-10 Ruhrgas Ag METHOD AND DEVICE FOR MEASURING ALDEHYDE CONCENTRATION IN EXHAUST GASES
GB2206697A (en) * 1987-06-11 1989-01-11 Junichi Nishizawa Measuring very low water content in gas
GB2206697B (en) * 1987-06-11 1991-12-18 Junichi Nishizawa Measuring the dew-point or frost-point of a gas

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee