Duct detector with remote airflow test capability

Patent metadata

Field	Value
Publication number	US-9459208-B2
Application number	US-201314046157-A
Country	US
Kind code	B2
Filing date	Oct 4, 2013
Priority date	Oct 4, 2013
Publication date	Oct 4, 2016
Grant date	Oct 4, 2016

Abstract

A device and method for facilitating convenient measurement of airflow in a duct detector. The device may include a detector assembly and an airflow sensor mounted within the detector assembly. The airflow sensor may be coupled to a remote control device, such as via control circuitry. A method for testing airflow in the duct detector may be performed by measuring airflow in the detector assembly, generating a signal that corresponds to the measured airflow in the detector assembly, and determining whether the generated signal exceeds a predetermined threshold signal level. If the generated signal does not exceed the threshold signal level, alarms may be activated and/or blowers in a ventilation system may be deactivated.

First claim

The invention claimed is:

1. A particulate detector for use in a ventilation duct, comprising:
a detector assembly including an assembly housing, a filter screen, a labyrinth, a detector chamber, a light emitter, and a light detector;
an airflow sensor disposed within the assembly housing; and
control circuitry configured to deactivate a blower associated with a duct in which the particulate detector is installed if a signal generated by the airflow sensor does not exceed a predetermined threshold signal level.

2. The particulate detector of claim 1 , wherein the airflow sensor is operatively coupled to a remote control device.

3. The particulate detector of claim 2 , wherein the remote control device is coupled to the airflow sensor via a wired connection.

4. The particulate detector of claim 2 , wherein the remote control device is coupled to the airflow sensor via a wireless connection.

5. The particulate detector of claim 2 , wherein the remote control device is housed in a fixed-location panel within a building.

6. The particulate detector of claim 2 , wherein the remote control device is a portable unit.

7. The particulate detector of claim 2 , wherein the remote control device communicates with the airflow sensor through control circuitry associated with the duct detector.

8. The particulate detector of claim 1 , wherein when the particulate detector is in a clean condition, airflow through the detector assembly is sufficient to cause the signal generated by the airflow sensor to exceed a predetermined threshold signal level.

9. The particulate detector of claim 1 , wherein when the particulate detector is not in a clean condition, airflow through the detector assembly is insufficient to cause the signal generated by the airflow sensor to exceed a predetermined threshold signal level.

10. The particulate detector of claim 1 , wherein the airflow sensor comprises an anemometer.

11. A method for testing airflow in a particulate detector comprising:
measuring airflow in a detector assembly of the particulate detector using an airflow sensor;
generating a signal that corresponds to the measured airflow in the detector assembly;
determining whether the measured airflow exceeds a predetermined threshold airflow value; and
automatically deactivating a blower associated with a duct in which the particulate detector is installed if the generated signal does not exceed the predetermined threshold signal level.

12. The method of claim 11 , wherein determining whether the measured airflow exceeds a predetermined threshold airflow value comprises receiving the generated signal and comparing the generated signal to a predetermined threshold signal level.

13. The method of claim 12 , further comprising automatically activating an indicium if the generated signal does not exceed the predetermined threshold signal level.

14. The method of claim 11 , further comprising initiating testing of the airflow via a wireless control device.

15. The method of claim 11 , further comprising initiating testing of the airflow via a fire panel.

16. A particulate detector for use in a ventilation duct, comprising a main housing;
a detector assembly disposed within the main housing;
an airflow sensor mounted within the detector assembly; and
control circuitry configured to deactivate a blower associated with a duct in which the particulate detector is installed if a signal generated by the airflow sensor does not exceed a predetermined threshold signal level.

17. The particulate detector of claim 16 , wherein the airflow sensor is coupled to a fire panel.

18. The particulate detector of claim 17 , wherein the airflow sensor is coupled to the fire panel via a wired connection.

19. The particulate detector of claim 17 , wherein the airflow sensor is coupled to the fire panel via a wireless connection.

Assignees

• Simplexgrinnell Lp
• Tyco Fire & Security Gmbh

Inventors

• Orsini Todd F
• Brighenti Donald D
• Capowski Anthony J

Classifications

• G08B17/113

  Constructional details · CPC title

• G08B17/107

  for detecting light-scattering due to smoke · CPC title

• G01N21/53 Primary

  within a flowing fluid, e.g. smoke · CPC title

• G08B29/145 Primary

  of fire detection circuits · CPC title