Method and device for cleaning an optical entrance window of a fire alarm
AssigneeMinimax GmbH & Co. KG
InventorArne Stamer
Life of this patent
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Abstract
A method is provided for cleaning an optical entry window (1) of a fire detector (2), wherein an intermittent gas stream is discharged from at least one gas exit opening (7) onto the surface of the optical entry window (1) of the fire detector (2), wherein the intermittent gas stream having a number of pressure pulses (14) is discharged onto the optical entry window (1), and to an apparatus for cleaning an optical entry window. The method has the advantage that the optical entry window of a fire detector can be cleaned from contamination intermittently and corresponding to the intensity of contamination with a matched and low consumption of gas.
Claims16
A method for cleaning an optical entry window of a fire detector, comprising the steps:
- forming at least one gas exit opening proximate the optical entry window with a gas discharge means that encompasses the optical entry window, and
- discharging an intermittent gas stream from the at least one gas exit opening uniformly onto a surface of the optical entry window of the fire detector, wherein the intermittent gas stream having a number of pressure pulses is discharged onto the optical entry window;
- wherein a duration (t1) of the pressure pulse amounts to 10 milliseconds up to 5 seconds;
- and
- wherein a time (t2) between two pressure pulses amounts to 10 milliseconds up to 5 seconds.
A method for cleaning an optical entry window of a fire detector, comprising:
- discharging an intermittent gas stream from a gas exit opening onto a surface of the optical entry window of the fire detector, and uniformly distributing the intermittent gas stream onto the optical entry window, wherein the gas exit opening comprises an annular gap opening, wherein the intermittent gas stream is uniformly distributed through the annular gap opening, and wherein a duration (t1) of a pressure pulse of the intermittent gas stream amounts to 10 milliseconds up to 5 seconds;
- and
- wherein a time (t2) between two pressure pulses of the intermittent gas stream amounts to 10 milliseconds up to 5 seconds.
A method for cleaning an optical entry window of a fire detector, comprising the steps:
- forming at least one gas exit opening at the circumference of the optical entry window of the fire detector;
- and
- discharging an intermittent gas stream from the at least one gas exit opening onto a surface of the optical entry window of the fire detector, wherein a duration (t1) of a pressure pulse of the intermittent gas stream amounts to 10 milliseconds up to 5 seconds;
- wherein a time (t2) between two pressure pulses of the intermittent gas stream amounts to 10 milliseconds up to 5 seconds and;
- wherein the forming the at least one gas exit opening at the circumference of the optical entry window comprises locating a gas discharge means above the optical entry window.
Dependencies are inferred from the claim text.