Koninklijke Philips Corporation N.v.

Achim Gerhard Koerber

Rainer Hilbig

Robert Peter Scholl

Johannes Baier

Peter Josef Schmidt

Cornelis Reinder Ronda

Thomas Juestel

Johannes Marra

The present invention relates to a device and method for determining the pollution status of a particle filter () for an air-cleaning device () with increased accuracy at low extra costs. The device comprises a sheet resistance input () for obtaining sheet resistance information () indicating or allowing to determine an electrical sheet resistance of the particle filter (); a humidity input () for obtaining humidity information () indicating the relative humidity of the filter's environment; and a processor () for comparing the electrical sheet resistance indicated by or determined from the obtained sheet resistance information () with a reference sheet resistance of a clean particle filter at the relative humidity () indicated by the obtained humidity information and given at the time of acquisition of said electrical sheet resistance and for generating, based on said comparison, a control signal () for control of the air-cleaning device and/or a status information () indicating the pollution status of the particle filter ().

Device and method for determining the pollution status of a particle filter in an air-cleaning device

A low-pressure gas discharge lamp includes a gas discharge vessel containing an inert gas filling as a buffer gas, and electrodes for generating and maintaining a low-pressure gas discharge. The lamp contains at least one tin halide.

Low-pressure gas discharge lamp with gas filling containing tin

A low-pressure gas discharge lamp provided with a gas discharge vessel containing a mercury-free gas filling with an indium compound in an amount of about 1 to 10 microgram per cubic centimeter and a partial pressure in the range from 1.0 to 30 micro bar, and a buffer gas for emitting radiation in a continuous spectrum in the visible and near UVA regions of the electromagnetic spectrum, which low-pressure gas discharge lamp is also provided with electrodes and a ballast for controlling the ignition and operation of the lamp.

Low-pressure gas discharge lamp having a mercury-free gas filling with an indium compound

A low-pressure gas discharge lamp having a gas discharge vessel containing a gas filling with a chalcogenide of the elements of the 4th main group of the periodic systems of elements and a buffer gas, and having inner or outer electrodes and means for generating and maintaining a low-pressure gas discharge.

Low-pressure gas discharge lamp with a mercury-free gas filling

A low-pressure gas discharge lamp having a gas discharge vessel containing a gas filling including a copper compound. The copper compound is selected from the oxides, chalcogenides, hydroxides, hydrides and the metalorganic compounds of copper. In addition to the copper compound, the gas filling includes a buffer gas such as argon, and may also include a thallium compound and/or a copper halogenide.

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Kerkrade, Netherlands

Achim Gerhard Koerber