Ignition-source detecting system and associated methods
A system of ignition-source detection and prevention in containers and open materials handling systems. The system includes an electronic processor located in close proximity to a detector, a spray nozzle, and a valve. The electronic processor may be configured to be placed in a dust-hazard environment. The detector may be configured to detect radiation and/or a flame. Associate methods are also disclosed, including: a method of responding to an ignition source, a method of installing an ignition-source detection system, and a method of testing an ignition-source detection system.
1. An ignition-source detecting system comprising:
an electronic processor configured to control the ignition-source detecting system; and
at least one detector configured to detect radiation in a container, the at least one detector configured to output a modulated voltage having a high voltage and a low voltage.
2. The ignition-source detecting system recited in claim 1 , further comprising:
at least one spray nozzle configured to release a fluid; and
at least one valve configured to control flow of the fluid to the spray nozzle in response to a signal received from the electronic processor.
3. The ignition-source detecting system recited in claim 1 , wherein
the electronic processor is mounted on the container.
4. The ignition-source detecting system recited in claim 1 , wherein
the electronic processor can be programmed.
5. The ignition-source detecting system recited in claim 1 , wherein
the electronic processor contains no mechanical or solid state relays.
6. The ignition-source detecting system recited in claim 1 , wherein
the electronic processor includes dip switches for configuring the ignition-source detecting system.
7. The ignition-source detecting system recited in claim 1 , wherein
the electronic processor includes a communications bus.
8. The ignition-source detecting system recited in claim 7 , wherein
the ignition-source detecting system is a first ignition-source detecting system and
the electronic processor of the first ignition-source detecting system communicates with a remote monitor via the communications bus.
9. The ignition-source detecting system recited in claim 8 , wherein
the remote monitor is configured to perform at least one of the following functions: indicate a status of the electronic processor, cancel an alarm condition of the electronic processor, and log data generated by the electronic processor.
10. The ignition-source detecting system recited in claim 8 , wherein
a plurality of ignition-source detection systems communicates with the remote monitor, the monitor being configured to display information from one or all of the ignition-source detection systems.
11. The ignition-source detecting system recited in claim 8 , wherein
the monitor communicates with the electronic processor of the first ignition-source detecting system via a first dedicated cable with no intervening components and
the monitor communicates with the electronic processor of a second ignition-source detecting system through the first dedicated cable.
12. The ignition-source detecting system recited in claim 8 , wherein
the electronic processor of the first ignition-source detecting system communicates with an electronic processor of a second ignition-source detecting system via a dedicated cable with no intervening components.
13. The ignition-source detecting system recited in claim 2 , wherein
the container has an upstream section and a downstream section;
the at least one detector is located at the upstream section of the container; and
the at least one spray nozzle is located at the downstream section of the container.
14. The ignition-source detecting system recited in claim 1 , further comprising:
a keypad mounted on the electronic processor.
15. The ignition-source detecting system recited in claim 14 , wherein
the keypad contains a first switch and a second switch;
the first switch being configured to initiate a test or reset of the system; and
the second switch being configured to mute or cancel an alarm triggered by the system.
16. The ignition-source detecting system recited in claim 1 , wherein
the at least one detector is further configured to detect a flame.
17. The ignition-source detecting system recited in claim 15 , further comprising
a device configured to extinguish a flame.
18. The ignition-source detecting system recited in claim 1 , wherein the radiation in a container is one of infrared radiation or ultraviolet radiation.
19. The ignition-source detecting system recited in claim 1 , wherein the at least one detector is configured to detect at least one of temperature, gas characteristics, and motion.
20. The ignition-source detecting system recited in claim 1 , wherein
the electronic processor is configured to be disposed in a hazard environment.
21. The ignition-source detecting system recited in claim 20 , wherein:
the hazard environment is one defined as ATEX Zone 21 or ATEX Zone 22; ATEX Zone 1 or ATEX Zone 2; or NEC class C2D1, NEC class C2D2, NEC class C1D1, or NEC class C1D2.
22. The ignition-source detecting system recited in claim 1 , wherein
the at least one detector can be adjusted for sensitivity before, after, or during use or installation.
23. The ignition-source detecting system recited in claim 1 , wherein
the at least one detector is configured to sense radiation released by a low temperature hot material.
24. The ignition-source detecting system recited in claim 1 , wherein
the at least one detector is a first detector and the ignition-source detecting system further comprises a second detector.
25. The ignition-source detecting system recited in claim 24 , wherein
the first detector is configured to detect radiation having a first range of wavelengths;
the second detector is configured to detect radiation having a second range of wavelengths; and
the first and second ranges of wavelengths are different.
26. The ignition-source detecting system recited in claim 25 , wherein
the first and second ranges of wavelengths overlap.
27. The ignition-source detecting system recited in claim 1 , wherein
the at least one detector is configured to output the modulated voltage before detecting radiation.
28. The ignition-source detecting system recited in claim 27 , wherein
the modulated voltage has the high voltage before detecting radiation, and the at least one detector is configured to change the modulated voltage to the low voltage after detecting radiation.
29. The ignition-source detecting system recited in claim 28 , wherein
the at least one detector is further configured to change the modulated voltage after detecting a system failure.
30. The ignition-source detecting system recited in claim 1 , further comprising
a heat tracing circuit.
31. The ignition-source detecting system recited in claim 30 , wherein
the electronic processor is configured to monitor the heat tracing circuit; and
the electronic processor is configured to raise an alarm if the heat tracing circuit stops receiving electricity.
32. The ignition-source detecting system recited in claim 1 , further comprising:
a primary power source; and
a secondary power source, wherein the secondary power source is independent from the primary power source.
33. The ignition-source detecting system recited in claim 32 , wherein the secondary power source is a battery connected to the electronic processor.
34. The ignition-source detecting system recited in claim 1 , further comprising
a light emitting diode (LED) configured to generate a test signal.
35. The ignition-source detecting system recited in claim 34 , wherein
the light emitting diode (LED) is part of the detector.
36. The ignition-source detecting system recited in claim 1 , wherein
the modulated voltage is a first modulated voltage, wherein the at least one detector is configured to transmit the first modulated voltage for a normal system operating condition, and wherein the at least one detector is further configured to transmit a second modulated voltage for a system interruption condition and a third modulated voltage for an ignition source identified condition.
37. The ignition-source detecting system recited in claim 1 , wherein
the system has a response time within the range of 160 milliseconds and 250 milliseconds.
38. The ignition-source detecting system recited in claim 1 , wherein
the system has a response time of 160 milliseconds or less.
39. The ignition-source detecting system recited in claim 1 , wherein
the system has a response time of 180 milliseconds or less.
40. The ignition-source detecting system recited in claim 1 , wherein
the system has a response time of 200 milliseconds or less.
41. A method of installing an ignition-source detecting system, comprising:
locating an electronic processor in close proximity to a container;
mounting a detector on the container, the detector being configured to detect radiation in a container, the detector further configured to output a modulated signal having a high voltage and a low voltage; and
connecting the electronic processor and detector via dedicated wires.
42. The method of installing an ignition-source detecting system recited in claim 41 , further comprising:
mounting a spray nozzle on the container;
mounting a valve for controlling flow of a fluid to the spray nozzle on the container; and
connecting the electronic processor, detector, and valve via dedicated wires.
43. The method of installing an ignition-source detecting system recited in claim 42 , further comprising
mounting the electronic processor on the container.
44. The method of installing an ignition-source detecting system recited in claim 42 , further comprising
mounting the electronic processor in a dust-hazard environment.
45. The method of installing an ignition-source detecting system recited in claim 42 , further comprising
setting dip switches disposed on the electronic processor to configure the ignition-source detecting system.
46. The method of installing an ignition-source detecting system recited in claim 42 , further comprising
configuring the detector to detect radiation within a predetermined range of wavelengths.
47. The method of installing an ignition-source detecting system recited in claim 42 , further comprising
connecting a monitor to the electronic processor via a dedicated communication cable, the monitor being remote from the container.
48. An ignition-source detecting system, comprising:
an electronic processor for controlling the ignition-source detecting system and
a detector for detecting radiation, wherein
the detector is configured to output a generally square wave signal having a high voltage and a low voltage, the detector further configured to modify the generally square wave signal when radiation is detected, and
the electronic processor and detector are designed for positioning in an ATEX Zone 21 or NEC Class 2, Division 1 location.
49. A method of responding to an ignition source, comprising:
sending a modulated voltage to an electronic processor, the modulated voltage having a high voltage and a low voltage;
detecting a source of radiation in a container;
modifying the duration of either the high voltage or the low voltage in response to a detected source of radiation;
sending a signal from the electronic processor to a valve in response to the modified duration; and
actuating the valve to release fluid through a spray nozzle.
50. The method of responding to an ignition source recited in claim 49 , further comprising
monitoring a status of the electronic processor via a remote monitor.
51. The ignition-source detecting system recited in claim 1 , wherein
the high voltage has a first duration;
the low voltage has a second duration; and
the at least one detector is configured to increase one or more of the first duration and the second duration when radiation is detected in the container.
52. The ignition-source detecting system recited in claim 51 , wherein
the at least one detector is further configured to increase one or more the first duration or the second duration for a time corresponding to a length of time that the radiation is detected in the container.
53. The ignition-source detecting system recited in claim 52 , wherein
the modulated voltage takes the form of a generally square wave.
54. The ignition-source detecting system recited in claim 27 , wherein
the modulated voltage has the low voltage before detecting radiation, and the at least one detector is configured to change the modulated voltage to the high voltage after detecting radiation.
55. The ignition-source detecting system recited in claim 54 , wherein
the at least one detector is further configured to change the modulated voltage after detecting a system failure.
56. The ignition-source detecting system recited in claim 54 , wherein
the modulated voltage returns to the low voltage when radiation is no longer detected.
57. The ignition-source detecting system recited in claim 54 , wherein
the high voltage has a fixed duration, after which the modulated voltage returns to the low voltage.
58. The ignition-source detecting system recited in claim 57 , wherein
the modulated voltage returns to the high voltage.
59. The ignition-source detecting system recited in claim 28 , wherein
the modulated voltage returns to the high voltage when radiation is no longer detected.
60. The ignition-source detecting system recited in claim 28 , wherein
the low voltage has a fixed duration, after which the modulated voltage returns to the high voltage.
61. The ignition-source detecting system recited in claim 60 , wherein
the modulated voltage returns to the low voltage.
62. The method of claim 41 , further comprising:
configuring the detector to change the modulated voltage signal from the high voltage to the low voltage when radiation is detected.
63. The method of claim 41 , further comprising:
configuring the detector to output the high voltage for a first duration and the low voltage for a second duration.
64. The method of claim 63 , further comprising:
configuring the detector to modify one or more of the first duration and second duration when radiation is detected.
65. An ignition-source detecting system comprising:
an electronic processor configured to control the ignition-source detecting system; and
at least one detector configured to detect radiation in a container and output a modulated signal to the electronic processor; wherein,
the modulated signal has a high value and a low value.
66. The ignition-source detecting system of claim 65 , wherein the modulated signal is a modulated voltage signal.
67. The ignition-source detecting system of claim 65 , wherein the modulated signal has the high value before radiation is detected, and wherein the detector is configured to change the modulated signal to the low value after radiation is detected.
68. The ignition-source detecting system of claim 65 , wherein the modulated signal has the low value before radiation is detected, and wherein the detector is configured to change the modulated signal to the high value after radiation is detected.
69. The ignition-source detecting system of claim 65 , wherein the high value has a first duration and the low value has a second duration.
70. The ignition-source detecting system of claim 69 , wherein the detector is configured to modify either the first duration or the second duration in response to a detected source of radiation.