US3645134A - Psychrometer wick and psychrometer having such a wick - Google Patents

Psychrometer wick and psychrometer having such a wick Download PDF

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Publication number
US3645134A
US3645134A US845965A US3645134DA US3645134A US 3645134 A US3645134 A US 3645134A US 845965 A US845965 A US 845965A US 3645134D A US3645134D A US 3645134DA US 3645134 A US3645134 A US 3645134A
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United States
Prior art keywords
wick
psychrometer
bulb
thermometer
plug
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Expired - Lifetime
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US845965A
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English (en)
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Oskar Alfred Kreiberg
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Individual
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Individual
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    • 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
    • G01N25/62—Investigating or analyzing materials by the use of thermal means by investigating moisture content by psychrometric means, e.g. wet-and-dry bulb thermometers

Definitions

  • the invention relates to a psychrometer wick having a hoseshaped wick part adapted to sheathe a thermometer bulb and to reach down into a water vessel.
  • Such wicks have to be replaced frequently because they are rapidly polluted by dust and fat from the surrounding air whereby the suction effect of the wick is reduced and the psychrometer will not show the correct value.
  • a psychrometer wick is aimed at having a longer life than known wicks.
  • the psychrometer wick according to the invention is characterized in that at least the part of the wick intended to be situated beneath the thermometer bulb has a great cross section area of suctorial material.
  • the invention is based on the recognition that the said pollution occurs only in the outermost layers of the wick. lf therefore the cross section area of suctorial material is sufficiently great the wick will retain its suction effect for a very long time.
  • the part of the wick adapted to be situated beneath the thermometer bulb may have a greater cross section area of suctorial material than the part adapted to sheathe the thermometer bulb. In this case the outer dimension of the wick may be reduced without the suction effect being decreased.
  • the greater cross section area of suctorial material can be obtained by the fact that in the part of the wick adapted to be situated beneath the thermometer bulb a cylindrical plug of suctorial material is inserted.
  • This plug is protected against pollution by the surrounding hose-shaped wick part and will therefore retain its suction effect for a long time.
  • the hose-shaped wick part now only has to lift the water a little distance by capillary action, viz a distance corresponding almost tothe height of the thermometer bulb, since the well-protected plug lifts the water through the first distance. It has been proved in practice that hereby a substantial prolongation of the life of the wick is obtained.
  • thermometer bulb Another advantage of this wick is that it gets a more pleasant appearance because it retains its shape not only in the part surrounding the thermometer bulb but over its entire length.
  • the plug is of a comparatively stiff material.
  • the wick has substantially the same cross section over its whole length but also that the wick is straight which gives a pleasant appearance.
  • the plug may be made by rolling a suctorial paper, e.g., crepe paper.
  • the invention also relates to a psychrometer having a wick according to the invention sheathed on the thermometer bulb and reaching down into a water vessel, said psychrometer being characterized in that the bottom of the water vessel is shaped to support the wick.
  • the wick remains around the thermometer bulb without it being necessary, as with the known wicks, to bind it to the thermometer bulb or secure it in another way and furthermore that the plug reaches the bottom of the thermometer bulb.
  • thermometers 2 and 3 On a plate 1 two thermometers 2 and 3 are arranged each having its own scale 4 and 5.
  • the bulb 6 of the thermometer 2 is sheathed by a wick having a hose-shaped wick part 7 and a plug 8 of suctorial material inserted therein.
  • the wick reaches down into water in a water vessel 9 arranged on the plate 1.
  • the plug 8 of suctorial material may be formed in any suitable manner such as by rolling a sheet of crepe paper.
  • thermometer shows less than the thermometer 3.
  • the evaporation from the wick and thereby the difference between the readings of the two thermometers depend on the relative humidity of the surrounding air and this humidity can therefore be determined from the difference between the temperature readings.
  • a table may be provided between the two thermometers 2 and 3 at the levels of the temperature indications of the scale 5, this table has horizontal series of numbers indicating the relative humidity of the air for a number of differences between the thermometer readings.
  • the table may be so designed that there is only one series of numbers for every second indication of degree of the scale 5.
  • the plug 8 which is well protected within the hose-shaped wick part 7 is substantially not polluted by dust and fat from the surrounding air and will therefore retain its suction capacity almost unaltered for a very long time.
  • the wick part 7 now only has to lift the water a distance corresponding almost to the length of the thermometer bulb and this effect is maintainai for a much longer period than the capacity of this wick part to suck water the whole way from the water level in the vessel 9.
  • the wick as a whole gets a very long life.
  • the plug 8 is preferably comparatively rigid and fits rather exactly in the hose-shaped part 7, so that the wick as a whole is straight and has substantially the same outer dimension throughout its whole length which gives a pleasant appearance.
  • the plug preferably reaches from the lower end of v the wick to a place immediately beneath the thermometer bulb 6, whereby it functions in an optimal way as a wick.
  • a projection 10 in the bottom of the water vessel 9 and a lid 11 the wick is supported in the desired vertical posi tion.
  • the plug 8 preferably contacts the bottom of the thermometer bulb 6.
  • the projection 10 may have another shape. It may for instance be constituted by a stud fitting into the hose-shaped wick part 7 in which case the plug preferably not reaches the whole way down to the lower end of the hose-shaped wick part.
  • the projection may also be constituted by a rib which completely or partly surrounds the lower part of the wick.
  • the plug 8 preferably has substantially the same diameter as the thermometer bulb 6, whereby is obtained that it fills the hose-shaped wick part 7 which fits well around the thermometer bulb 6.
  • the hose-shaped wick part and the plug may be of circular cross section or may have any other cross section. They may for instance be of polygonal or star-shaped cross section.
  • thermometer bulb instead of the plug described use may be made of an increased wall thickness which may, if desired, be present only in the part lying beneath the thermometer bulb.
  • a psychrometer wick structure comprising an elongated hose-shaped wick member of suctorial material, and a body of suctorial material in the form of a cylindrical plug positioned in and at least substantially filling the cross section of said hoseshaped wick member over a substantial portion of its length, said hose-shaped wick member having at least one end thereof extending axially outward from said body of suctorial material for receiving a thermometer bulb.
  • a psychrometer comprising a dry bulb thermometer, a wet bulb thermometer, a water vessel beneath said thermometers, a hose-shaped wick having its upper end sheathing the bulb of said wet bulb thermometer and its lower end reaching the bottom of said water vessel, and a relatively rigid plug of suctorial material substantially filling the portion of said hose shaped wick not sheathing said bulb of said wet-bulb thermometer.
  • the psychrometer as claimed in claim 3 further comprising means on the bottom of said water vessel adapted to engage and prevent said wick from moving laterally in at least one direction.

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  • 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)
  • Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
US845965A 1968-07-31 1969-07-30 Psychrometer wick and psychrometer having such a wick Expired - Lifetime US3645134A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK369568AA DK118160B (da) 1968-07-31 1968-07-31 Psychrometervæge samt psychrometer med en sådan væge.

Publications (1)

Publication Number Publication Date
US3645134A true US3645134A (en) 1972-02-29

Family

ID=8125755

Family Applications (1)

Application Number Title Priority Date Filing Date
US845965A Expired - Lifetime US3645134A (en) 1968-07-31 1969-07-30 Psychrometer wick and psychrometer having such a wick

Country Status (7)

Country Link
US (1) US3645134A (de)
BE (1) BE736705A (de)
CH (1) CH492979A (de)
DE (1) DE1938464C3 (de)
DK (1) DK118160B (de)
FR (1) FR2014072A1 (de)
NL (1) NL6911717A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4625550A (en) * 1983-09-13 1986-12-02 Sorensen Ansgar C H Method and apparatus for the continuous psychrometric measurement of the concentration of a vaporous component in a gas
US4763522A (en) * 1986-10-31 1988-08-16 Exergen Corporation Radiation detector psychrometer
NL9301362A (nl) * 1993-08-04 1995-03-01 Marinus Gerrit Mol Verbeterde hygrometer alsmede verbeterde vloeistof voor bevochtiging van de natte thermometer van een hygrometer.

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4116223A1 (de) * 1991-05-17 1992-11-19 Bayerische Motoren Werke Ag Kraftfahrzeug mit einem abnehmbaren, festen aufsetzdach
DE19722093A1 (de) * 1997-05-27 1998-12-03 Inst Agrartechnik Bornim E V Anordnung zur Messung der Luftfeuchte in Pflanzenbeständen
CN113791119A (zh) * 2021-10-14 2021-12-14 云南省烟草农业科学研究院 一种密集烤房干湿球温度传感器

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US168505A (en) * 1875-10-05 Improvement in psychrometers
US1176425A (en) * 1914-09-08 1916-03-21 Bristol Company Hygrometer.
US1586351A (en) * 1924-03-15 1926-05-25 Foxboro Co Fitting for thermometers
US2095237A (en) * 1932-08-13 1937-10-12 Donald B Brooks Continuous ventilating psychrometer
US3196683A (en) * 1963-03-20 1965-07-27 Exxon Research Engineering Co Psychrometric wet-bulb water supply system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US168505A (en) * 1875-10-05 Improvement in psychrometers
US1176425A (en) * 1914-09-08 1916-03-21 Bristol Company Hygrometer.
US1586351A (en) * 1924-03-15 1926-05-25 Foxboro Co Fitting for thermometers
US2095237A (en) * 1932-08-13 1937-10-12 Donald B Brooks Continuous ventilating psychrometer
US3196683A (en) * 1963-03-20 1965-07-27 Exxon Research Engineering Co Psychrometric wet-bulb water supply system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4625550A (en) * 1983-09-13 1986-12-02 Sorensen Ansgar C H Method and apparatus for the continuous psychrometric measurement of the concentration of a vaporous component in a gas
US4763522A (en) * 1986-10-31 1988-08-16 Exergen Corporation Radiation detector psychrometer
NL9301362A (nl) * 1993-08-04 1995-03-01 Marinus Gerrit Mol Verbeterde hygrometer alsmede verbeterde vloeistof voor bevochtiging van de natte thermometer van een hygrometer.

Also Published As

Publication number Publication date
DE1938464C3 (de) 1980-08-21
CH492979A (de) 1970-06-30
DK118160B (da) 1970-07-13
DE1938464B2 (de) 1979-12-13
DE1938464A1 (de) 1970-02-12
FR2014072A1 (de) 1970-04-10
BE736705A (de) 1969-12-31
NL6911717A (de) 1970-02-03

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