Flame detector and protective cover with wide spectrum characteristics

• US 5,773,826 A
• Filed: 03/01/1996
• Issued: 06/30/1998
• Est. Priority Date: 03/01/1996
• Status: Expired due to Term

• Current Assignee: Honeywell International Inc.
• Original Assignee: Fire Sentry Systems, Inc. (Honeywell International Inc.)
• Inventors: Castleman, David A., Selstad, Chris A.
• Primary Examiner(s): Porta, David P.
• Assistant Examiner(s): HANIG, RICHARD E
• Application Number:
  US08/609,740
• Time in Patent Office: 851 Days
• Field of Search: 250/339.15, 250/339.14, 250/339.01, 340/578
• US Class Current: 250/339.15
• CPC Class Codes: G08B 17/12 Actuation by presence of radiation or particles, e.g. of infrared radiation or of ions
• CPC Class Codes: G08B 25/002 Generating a prealarm to the central station
• CPC Class Codes: G08B 29/24 Self-calibration, e.g. compensating for environmental drift or ageing of components

Abstract

The present invention relates to a flame detector and protective cover with wide spectrum characteristics. The novel flame detector has wide spectrum sensitivity, which facilitates increased sensitivity to any sign of a flame or fire. The protective cover has wide spectrum transmittance characteristics. The protective cover facilitates reduced cleaning requirements and less disruption of the automated process for cleaning purposes. The wide spectrum transmittance characteristics of the protective cover enable it to be used with any flame detector utilizing non-ultraviolet sensing techniques.

Claims

1. A protective cover for use with a flame detector disposed within a housing having a viewing window, said flame detector with sensitivity for a visible band, near band infrared, and a wide infrared spectrums, said protective cover for preventing accumulation of paint, grime or the like on the viewing window, comprising:

a one-piece configuration shaped to completely surround said viewing window, said one-piece configuration having wide spectrum transmittance characteristics that transmit radiant energy in said visible band, said near band, and said wide infrared spectrums to which said flame detector is sensitive.

2. A protective cover according to claim 1, wherein said one-piece configuration further comprising:

a circular portion with a groove running along its circumference; and

a flange located at a base of said circular portion with a plurality of reinforcing members.

3. A protective cover for use with a flame detector according to claim 1, wherein said wide spectrum transmittance characteristics of said one-piece configuration accommodate transmission of radiant energy including visible and infrared (IR) energy within a range of 700 nanometers to 5 nanometers.

4. A protective cover for use with a flame detector according to claim 1, wherein said one-piece configuration is fabricated from a clear material with rigidity and resilience.

5. A protective cover for use with a flame detector according to claim 1, wherein said one-piece configuration is fabricated from polyvinyl chloride (PVC).

6. A protective cover for use with a flame detector according to claim 1, wherein said one-piece configuration comprises a coating of an anti-static agent.

7. A protective cover for use with a flame detector according to claim 6, wherein said anti-static agent is "ORVIS®

-K."

8. An apparatus for flame detection within a given monitored area, further comprising:

a flame detector disposed within a housing having a viewing window, said flame detector comprising a sensor array with wide spectrum sensitivity including visible band, near band infrared, and wide infrared spectrums for detecting any ignition within said monitored area; and

a protective cover for use with said flame detector and for preventing accumulation of paint, grime or the like on said viewing window that may impact said wide spectrum sensitivity of said flame detector, said protective cover having wide spectrum transmittance characteristics that match the wide spectrum sensitivity of said flame detector.

9. An apparatus according to claim 8, wherein said protective cover further comprises:

a one-piece configuration shaped to completely surround said viewing window.

10. An apparatus for flame detection within a given monitored area according to claim 8, wherein said one-piece configuration further comprises:

a cylindrical portion with a groove running along its circumference; and

a flange located at a base of said circular portion with a plurality of reinforcing members.

11. An apparatus for flame detection within a given monitored area according to claim 8, wherein said wide spectrum transmittance characteristics of said one-piece configuration accommodate transmission of radiant energy including visible and infrared (IR) within a range of 700 nanometers to 5 nanometers.

12. An apparatus for flame detection within a given monitored area according to claim 8, wherein said one-piece configuration is fabricated from a clear material with rigidity and resilience.

13. An apparatus for flame detection within a given monitored area according to claim 8, wherein said one-piece configuration is fabricated from polyvinyl chloride (PVC).

14. An apparatus for flame detection within a given monitored area according to claim 8, wherein said one-piece configuration comprises a coating of an anti-static agent.

15. An apparatus for flame detection within a given monitored area according to claim 14, wherein said anti-static agent is "ORVIS®

-K."

16. An apparatus for flame detection with a given monitored area according to claim 8, further comprising:

a computer for processing data on radiant energy supplied by said sensor array.