Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1999-05-27
2000-03-21
Lefkowitz, Edward
Communications: electrical
Condition responsive indicating system
Specific condition
340607, 95 25, 95273, 96 18, 96 26, G08B 2100
Patent
active
060407778
ABSTRACT:
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.
REFERENCES:
patent: 4203734 (1980-05-01), Winter
patent: 4332734 (1982-06-01), Hengst et al.
patent: 5080699 (1992-01-01), Ho et al.
Gerry O Wood Jan. 1994 Estimating Service Lives of Organic Vapor Cartridges AISA Journal.
Ammann Klaus
Bather Wolfgang
Drager Sicherheitstechnik GmbH
Lefkowitz Edward
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