Drager Sicherheitstechnik Gmbh

Dragerwerk Aktiengesellschaft

Dräger Safety Ag&co. Kgaa

Klaus Ammann

Wolfgang Bather

Gerhold Muhmel

Michael Dietrich

Benjamin Brandenburg

Andre Freund

Björn Wiese

Julia Wirschal

A sorption agent comprising activated carbon and an impregnation of the activated carbon for the sorption of air pollutants, wherein the impregnation contains a zinc compound and a molybdenum compound, as well as a gas-filtering element, such as a respirator canister, containing said sorption agent.

Sorption agent comprising an activated carbon impregnated with a zinc compound and a molybdenum compound and gas-filtering element containing the sorption agent

A device for displaying the exhaustion of a gas filter filled with an adsorbent (3). A toxic gas detector (14) determines the toxic gas content at a sampling site (8) within the adsorbent (3). A reference sampling site (12) is located in the area of a gas inlet point (6) of the gas filter (2). The toxic gas detector is designed such that it determines the toxic gas content alternately at the sampling sites (8, 12), and the exhaustion of the filter is determined by a comparison of the toxic gas content at the sampling site (8) with the toxic gas content at the reference sampling site (12).

Device and process for displaying the exhaustion of a gas filter

A device and a process for indicating the exhaustion of an adsorption filter to indicate a necessary filter change in time is provided. The monitoring device has a gas concentration-measuring device (8), a temperature-measuring device (9) for determining the temperature of the ambient air, a memory unit (3) with a first memory field (4), in which filter data sets associated with individual filters are stored, with a second memory field (5), in which data specific of toxic substances are stored, and with a third memory field (6), which contains preset values for the ambient air humidity and the respiratory minute volume, as well as an input unit (7) for selecting preset values from the memory fields (4, 5, 6). A timer (10) with a start button (13), which provides an output of the service life t of the adsorption filter is also provided. An evaluating circuit (2) is provided, which determines a remaining capacity of the adsorption filter from the values selected with the input unit (7), the measured toxic substance content in the ambient air, the temperature of the ambient air, and the service life t, and an alarm means (11) for generating a filter exhaustion signal when the remaining capacity is lower than or equal to a preset limit value.

Device and process for indicating the exhaustion of a filter

A gas filter media with a parallel layer structure, which comprise individual layers of adhesive and adsorbent particles, wherein the thermoplastic adhesive is solvent-free and is preferably based on polypropylene or polyethylene. Using the manufacturing process according to the present invention, it is possible to intentionally prepare gas filter media with adjustable packing density and pressure drop. The gas filter media according to the present invention can be used in respirator filters, room air filters, in ventilation filters for vehicles, or in apparatus filters.

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Sereetz, Germany

Klaus Ammann