B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 53/30 (2006.01) B01D 46/46 (2006.01)
Patent
CA 2279671
The present invention relates to a device and a method for indicating exhaustion of an adsorption filter in order to provide timely indication of the need to replace the filter. The monitoring device according to the present invention is characterized by a gas-concentration measuring device (8), a temperature measuring device (9) to determine the temperature of the ambient air, a memory unit (3) with a first memory field (4) that contains filter-data sets associated with individual adsorption filters, a second memory field (5) in which data specific to hazardous substances are stored, and with a third data field (6) that contains given values for ambient air humidity and respiration rate/volume; also provided are an input unit (7) for selecting given values from the memory field (4, 5, 6), a timer (10) with a start button (13), which yields the time t for which the adsorption filter has been used, and analyzer circuit (2) that calculates the remaining capacity of the adsorption filter from the values selected with the input unit (7), from the measured content of hazardous substance in the ambient air, from the temperature of the ambient air, and the time of use t, and an alarm system (11) that emits a signal indicating filter exhaustion if the remaining capacity is smaller than or equal to a given limiting value. 16
Ammann Klaus
Bather Wolfgang
Drager Sicherheitstechnik Gmbh
Fetherstonhaugh & Co.
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