EP0884705A2 - Feuchtigkeitsschutzeinrichtung für Bewegungsmelder - Google Patents
Feuchtigkeitsschutzeinrichtung für Bewegungsmelder Download PDFInfo
- Publication number
- EP0884705A2 EP0884705A2 EP98106944A EP98106944A EP0884705A2 EP 0884705 A2 EP0884705 A2 EP 0884705A2 EP 98106944 A EP98106944 A EP 98106944A EP 98106944 A EP98106944 A EP 98106944A EP 0884705 A2 EP0884705 A2 EP 0884705A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- water
- motion detector
- water outlet
- filter
- 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.)
- Withdrawn
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000004033 plastic Substances 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims abstract description 5
- 239000000919 ceramic Substances 0.000 claims abstract description 3
- 239000002184 metal Substances 0.000 claims abstract description 3
- 230000005855 radiation Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
- G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
- G08B13/19—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems
Definitions
- the invention relates to a moisture protection device of a motion detector with plastic housing.
- Motion detectors especially passive infrared motion detectors, used outdoors used by buildings are weather influences, in particular Exposed to rain.
- the known design of commercially available motion detectors is guaranteed not completely watertight. This also applies to devices with high Moisture protection class.
- the causes of possible water ingress are diverse, such as Capillary action on sealing edges, manufacturing defects on housing parts, Joining tolerances of the assembly parts, cable entries, leaks in the area of operating elements, e.g. Potentiometer axes or switches.
- Water present in the housing of a motion detector can vary depending on the speed of entry and quantity lead to errors and problems of different kinds. For example, there is a risk of electrical short circuits, device failure, a violation of protection against accidental contact as well as a fire. An evaporation Ingress of water increases the humidity in the device and can cause moisture to build up on components such as IR detectors and lead optical components.
- the moisture in the device also affects the transmissivity of the atmosphere in the device for the heat radiation to be detected is significantly influenced. Likewise, condensed water is almost impermeable to heat radiation. water and water vapor in the device lead to a considerable one for these reasons Loss of range.
- a possible measure to enable water to be removed is consists in the arrangement of a drainage hole on the housing.
- Such Housing opening is made at the lowest point of the housing to the installation position specified by the manufacturer. If the opening is sufficient large, penetrated water flows away safely. Such a relatively large one But opening also allows for a significant airflow that leads to partial temperature differences on an infrared lens system used in the housing can. Partial and temporally variable temperature differences can Changes in the intrinsic radiation of the lenses and, as a result, incorrect detection to lead. In the case of an unfavorable installation position, water can also flow through the housing opening penetrate freely into the housing, which then causes the above Problems are more likely to occur.
- the invention is therefore based on the object for motion detectors with a plastic housing to provide improved moisture protection.
- Figure 1 shows the housing 1 of a passive infrared motion detector with a optical system 2 on the front of the housing for detecting infrared rays.
- the housing 1 is on a vertical mounting wall 3, e.g. a building wall assembled.
- a water drain opening 5 is present, into which a porous solid filter 6 is inserted is.
- Solid state filters are known from applications in the chemical laboratory equipment industry. They are used to filter gases or liquids and are used in glass vessels or other equipment. Porous solid-state filters are available on the market in tablet form, for example, as pressed, sintered ceramic or as porous metal or plastic filters in various forms. For use in housings of motion detectors, however, care must be taken to ensure that solid-state filters with hydrophilic behavior must attract water and release them in droplet form on the underside of the filter. A desired speed of the Water drainage "can be achieved by choosing a suitable porosity and the filter material.
- a hydrophobic filter that is also available on the market would be for use in motion detectors not suitable as it is water repellent by itself, and for a liquid transport a pressure difference between the interior of the housing and would require the outside, which is not given.
- a disk-shaped solid filter can, depending on the material of the housing 1 in the Opening 5, for example glued or pressed in or molded there will.
- the housing base 4 has a recess 7 into which the solid-state filter can be inserted, e.g. is snapped.
- the housing 1 in the area of the water drain opening 5 can be provided with a water drainage edge 8, for example prevents water running along the housing from coming into direct contact with the filter.
- the filter is wetted from the outside and possible Water transport by capillary force inwards counteracts gravity.
- the size of the capillary force can be adjusted by the choice of the porosity, so that a Quasi-valve effect is achievable. Also due to the hydrophilic nature Water sucked in by the filter does not counter gravity into the interior of the housing submitted.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
- Filtering Materials (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
- Fig. 1
- eine Prinzipdarstellung eines Bewegungsmelders mit Festkörperfilter an der Gehäuseunterseite, und
- Fig. 2
- einen Schnitt durch den Gehäuseboden mit Filter.
Claims (3)
- Einrichtung zum Feuchtigkeitsschutz eines Bewegungsmelders, der ein Kunststoffgehäuse (1) mit einer Wasserablauföffnung (5) an der im montierten Zustand tiefstgelegenen Stelle des Gehäusebodens (4) aufweist, dadurch gekennzeichnet, daß die Wasserablauföffnung (5) mit einer porösen Festkörperfilterscheibe (6) verschlossen ist, die hydrophile Eigenschaften aufweist.
- Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die poröse Filterscheibe (6) aus Metall, Keramik oder Kunststoff besteht.
- Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß im Bereich der Wasserablauföffnung (5) auf der Außenseite des Gehäuses (1) eine Wasserablaufkante (8) angeformt ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19725080 | 1997-06-13 | ||
DE1997125080 DE19725080A1 (de) | 1997-06-13 | 1997-06-13 | Feuchtigkeitsschutzeinrichtung für Bewegungsmelder |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0884705A2 true EP0884705A2 (de) | 1998-12-16 |
EP0884705A3 EP0884705A3 (de) | 2000-03-15 |
Family
ID=7832427
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98106944A Withdrawn EP0884705A3 (de) | 1997-06-13 | 1998-04-16 | Feuchtigkeitsschutzeinrichtung für Bewegungsmelder |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0884705A3 (de) |
DE (1) | DE19725080A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10336429B4 (de) * | 2003-08-08 | 2011-12-22 | Abb Ag | Spritzwassergeschütztes, elektrisches Aufputz-Installationsgerät |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19952111C2 (de) * | 1999-10-29 | 2001-11-15 | Audi Ag | Verteilerkasten |
DE10241507A1 (de) * | 2002-09-07 | 2004-03-18 | Zf Friedrichshafen Ag | Vorrichtung zum Schutz elektrischer oder elektronischer Bauteile und Geräte |
DE102015108546B4 (de) | 2015-05-29 | 2021-12-09 | Volkswagen Ag | Vorrichtung zum Auslassen einer in eine elektrische Vorrichtung eingedrungenen Flüssigkeit, elektrische Vorrichtung sowie Fahrzeug |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0745842A1 (de) * | 1995-06-02 | 1996-12-04 | Staefa Control System Scs Ag | Feuchtefühler |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT193615B (de) * | 1953-12-17 | 1957-11-25 | Deutsche Edelstahlwerke Ag | Metallischer Sinterkörper und Verfahren zu seiner Herstellung |
US3066462A (en) * | 1959-02-09 | 1962-12-04 | Shell Oil Co | Demisting gas with mats |
DE4011453A1 (de) * | 1990-04-09 | 1991-10-10 | Abb Patent Gmbh | Passiv-infrarot-bewegungsmelder |
DE4208195A1 (de) * | 1992-03-14 | 1993-09-16 | Mesroc Gmbh | Selbsttragendes, beschichtetes filterelement |
GB9214716D0 (en) * | 1992-07-10 | 1992-08-19 | Emmark Technology | Tracheostomy filter |
US5546804A (en) * | 1994-08-11 | 1996-08-20 | Rosemount Inc. | Transmitter with moisture draining housing and improved method of mounting RFI filters |
-
1997
- 1997-06-13 DE DE1997125080 patent/DE19725080A1/de not_active Withdrawn
-
1998
- 1998-04-16 EP EP98106944A patent/EP0884705A3/de not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0745842A1 (de) * | 1995-06-02 | 1996-12-04 | Staefa Control System Scs Ag | Feuchtefühler |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10336429B4 (de) * | 2003-08-08 | 2011-12-22 | Abb Ag | Spritzwassergeschütztes, elektrisches Aufputz-Installationsgerät |
Also Published As
Publication number | Publication date |
---|---|
EP0884705A3 (de) | 2000-03-15 |
DE19725080A1 (de) | 1998-12-17 |
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Effective date: 20021023 |